JP3934148B2 - Data area number determination method, data management information acquisition method, and information reproducing apparatus - Google Patents

Description

  The present invention relates to a data area number determination method, a data management information acquisition method, and an information reproducing apparatus. More specifically, the recording area is divided into a plurality of data areas, and data can be recorded for each of the divided data areas. The present invention relates to a method for determining the number of data areas for an information recording medium, a data management information acquisition method for acquiring management information relating to data recording on the information recording medium, and an information reproducing apparatus for reproducing data based on the management information relating to data recording.

  In recent years, as the functions of personal computers have improved, it has become possible to handle AV (Audio-Visual) information such as music and video. Since the amount of such AV information is very large, optical discs such as CD-R and DVD + R have been attracting attention as information recording media. With the reduction in price, an optical disc device as an information reproducing device has become a personal computer. It became popular as one of the peripheral devices.

  A write-once optical disc such as a CD-R or DVD + R employs a file system compliant with a sequential UDF (Universal Disc Format) standard. In the recording area, data is sequentially recorded in recording units called tracks (called “fragments” in DVD + R). Further, a session is formed by adding lead-in and lead-out to an area composed of a plurality of tracks. Hereinafter, for convenience, a track and a fragment are collectively referred to as a track.

  For example, in DVD + R, a maximum of 191 sessions are allowed in the recording area, and a maximum of 16 fragments can be recorded in each session. That is, in the DVD + R, there can be a maximum of 3056 (= 191 × 16) fragments. In DVD + R, the lead-in after the second session is called an intro, and the lead-out before the final session is called a closure. Information on fragments in each session (fragment number, fragment start address, fragment last address, etc., hereinafter referred to as “fragment information”) is stored in the session disk control field in the lead-in (or intro) of each session. Each is recorded in an area called a block (Session Disc Control Block, hereinafter referred to as “SDCB”). Further, the SDCB includes not only all fragment information in the session but also information (session number, session start address, session end address, etc.) regarding all sessions before the session (for example, non-patent document). 1).

  In addition, in a host (for example, a personal computer), information relating to the recording of data recorded on the optical disc is required prior to reproduction of the optical disc. Therefore, in the host, information relating to the session on the optical disc (hereinafter referred to as “session information”, such as the number of sessions included in the recording area), and information relating to the track (the number of tracks included in the recording area) The data management information including the number and the track address indicating the recording position of the track (hereinafter referred to as “track information”) is requested to the optical disc apparatus.

  Then, in the optical disk device, for example, when the optical disk is DVD + R, the above-mentioned fragment information is notified to the host in response to the track information request from the host. When the optical disc is a CD-R, the optical disc apparatus records the track information from the host based on the track information recorded in an area called a program memory area (hereinafter referred to as “PMA”). Get an answer to the request.

"Data Interchange on 120mm and 80mm Optical Disc using + R Format -Capacity: 4.7 and 1.46 Gbytes per Side" Standard ECMA-349, 1st Edition-December 2003

  However, for example, when the optical disc is a DVD + R, the fragment information is recorded in the SDCB for each session as described above. Therefore, in the conventional optical disc apparatus, when the host requests track information, the fragment information is stored in the recording area. The SDCB within each distributed session had to be searched in order. Therefore, there is a disadvantage that the response speed, that is, the performance to the track information request from the host is remarkably lowered.

  Therefore, it is conceivable to acquire all the fragment information when the optical disk is inserted in the drive device in advance. However, for the same reason as described above, it takes a considerable time to acquire all the fragment information. There is an inconvenience that the so-called disk mount time is increased until the user can access the disk after being inserted into the drive device. Furthermore, since a maximum of 3056 fragments can exist in the DVD + R as described above, it is difficult to store information of all these fragments in the memory due to a problem of memory capacity.

  The present invention has been made under such circumstances, and a first object of the present invention is to enable quick acquisition of requested information in response to an acquisition request for information related to recording of data recorded on an information recording medium. It is to provide a method for determining the number of data areas.

  In addition, a second object of the present invention is to provide a data management information acquisition method that enables quick acquisition of requested information in response to an acquisition request for information related to recording of data recorded on an information recording medium. There is.

  A third object of the present invention is to provide an information reproducing apparatus capable of responding in a short time to an information acquisition request relating to recording of data recorded on an information recording medium.

The present invention is, to a first aspect, the information recording medium having at least one session, process and to obtain the number of the sessions in the recording area; if the number of the session is greater than 1, the data determining the number of sessions as the management information on recorded in pseudo-2, when the number of the session is 1, determining a number of sessions as the management information relating to the recording of data 1, including This is a method for determining the number of data areas.

According to this, when the number of sessions is acquired and the number of sessions is larger than 1, the number of sessions as management information regarding data recording is determined to be two in a pseudo manner. Therefore, it is possible to reduce the time required to acquire the management information, and as a result, the requested information can be quickly acquired in response to the information acquisition request regarding the recording of the data recorded on the information recording medium. It becomes possible.

From a second viewpoint, the present invention provides management information relating to recording of data in an information recording medium in which a recording area is divided into a plurality of data areas and data is recorded for each of the divided data areas. A data management information acquisition method for obtaining a response to a data management information acquisition request, wherein the recording area includes at least one session including a plurality of tracks as the data area, and the data management information acquisition request Accordingly, determining the number of sessions, which is the number of sessions included in the recording area; determining whether there is an open session in the session; and if the open session exists, close the session The session is regarded as a pseudo track, the number of the pseudo track and the open A step of calculating the total number of tracks included in the cushion as the total number of tracks; and track address indicating a recording position of the track specified by the total number of tracks has been calculated as the number of sessions sought track number And a step of responding to the data management information acquisition request as the data management information.

According to this, the number of sessions included in the recording area is obtained in response to the data management information acquisition request, and it is determined whether or not there is an open session in the session. If there is an open session, the closed session is regarded as a pseudo track, and the total number of the pseudo track and the number of tracks included in the open session is calculated as the total number of tracks. The number of sessions, the total number of tracks, and the track address are used as data management information as a response to the data management information acquisition request. In other words, information regarding a plurality of data areas of a plurality of data areas is regarded as information regarding a pseudo specific area within a range that does not adversely affect the information regarding the requested data management information. The time required to acquire the information can be shortened, and as a result, the requested information can be quickly acquired in response to the information acquisition request regarding the recording of the data recorded on the information recording medium.

From a third aspect, the present invention acquires management information related to data recording in an information recording medium in which a recording area is divided into a plurality of data areas and data can be recorded for each of the divided data areas. A data management information acquisition method, wherein the management information includes information on the number of the plurality of data areas, and a plurality of data areas excluding at least a final data area among all the data areas This is a second data management information acquisition method including a process that is regarded as a data area.

According to this, since the information regarding the number of the plurality of data areas is included and a plurality of data areas excluding at least the final data area among all the data areas are regarded as a single pseudo data area, the management is performed. The time required to acquire the information can be shortened, and as a result, the requested information can be quickly acquired in response to the information acquisition request regarding the recording of the data recorded on the information recording medium.

According to a fourth aspect of the present invention, there is provided an information reproducing apparatus using an information recording medium in which a recording area is divided into a plurality of data areas, and data can be recorded for each of the divided data areas. Includes at least one session including a plurality of tracks as the data area , and determines the number of sessions, which is the number of sessions included in the recording area, in response to an acquisition request for data management information related to data recording. Means for determining whether or not there is an open session in the session; if the open session exists, the closed session among the sessions is regarded as a pseudo track, and the number of the pseudo tracks and the open Means for calculating the total number of tracks contained in the session as the total number of tracks; Means for notifying answer to the acquisition request of the data management information and track addresses indicating recording positions of the tracks specified as the data management information by the obtained total number of tracks is calculated as the number of sessions and the track number; Is a first information reproducing apparatus.

According to this, the number of sessions included in the recording area is obtained in response to the data management information acquisition request, and it is determined whether or not there is an open session in the session. If there is an open session, the closed session is regarded as a pseudo track, and the total number of the pseudo track and the number of tracks included in the open session is calculated as the total number of tracks. The number of sessions, the total number of tracks, and the track address are used as data management information as a response to the data management information acquisition request. In other words, information regarding a plurality of data areas of a plurality of data areas is regarded as information regarding a pseudo specific area within a range that does not adversely affect the information regarding the requested data management information. The time required to acquire information can be shortened as compared with the prior art. As a result, it is possible to respond to an information acquisition request related to the recording of data recorded on an information recording medium in a short time. .

The present invention is, to a fifth aspect of an information reproducing apparatus using an information recording medium having at least one session in the recording area, the number of regions acquisition means and that acquires the number of the session; the number of the session determining if greater than 1, the number of sessions as management information regarding recording data artificially decided to 2, when the number of the session is 1, the number of sessions as the management information relating to the recording of data in a A second information reproducing apparatus comprising: an area number determining means to perform; and a reproducing means for reproducing data based on the management information.

According to this, when the number of sessions is acquired by the number-of-regions acquisition unit, and when the number of sessions is larger than 1 by the number-of-regions determination unit, the number of sessions as management information related to data recording is pseudo 2 To be determined. Accordingly, it is possible to shorten the time required to acquire the management information, and as a result, it is possible to reply in a short time to an information acquisition request regarding the recording of data recorded on the information recording medium. Become.

From a sixth aspect, the present invention acquires management information relating to data recording in an information recording medium in which a recording area is divided into a plurality of data areas and data can be recorded for each of the divided data areas. In the information reproducing apparatus for reproducing data based on the management information, the management information includes information on the number of the plurality of data areas, and a plurality of data areas excluding at least the last data area among all the data areas The third information reproducing apparatus is characterized in that the management information is acquired by regarding the data area as a single pseudo data area.

According to this, since a plurality of data areas excluding at least the final data area among all the data areas are regarded as a single pseudo data area and the management information is acquired, the management information is acquired. As a result, it is possible to respond in a short time to an acquisition request for information related to the recording of data recorded on the information recording medium.

<< First Embodiment >>
A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of an optical disc apparatus 20 as an information reproducing apparatus according to the first embodiment of the present invention.

  This optical disk device 20 includes a spindle motor 22 for rotating the optical disk 15 as an information recording medium, an optical pickup device 23, a laser control circuit 24, a motor driver 27, a reproduction signal processing circuit 28, a servo controller 33, a buffer RAM 34, A buffer manager 37, an interface 38, a ROM 39, a CPU 40, a RAM 41, and the like are provided. Note that the arrows in FIG. 1 indicate the flow of typical signals and information, and do not represent the entire connection relationship of each block.

  In the first embodiment, as an example, a DVD + R is used as the optical disc 15.

  The optical pickup 23 is a semiconductor laser as a light source, an optical system that guides a light beam emitted from the semiconductor laser to a recording surface of the optical disk 15 and guides a return light beam reflected by the recording surface to a predetermined light receiving position, It includes a light receiver that is disposed at a light receiving position and receives a return light beam, a drive system (such as a focusing actuator, a tracking actuator, and a seek motor) (all not shown). A signal (photoelectric conversion signal) corresponding to the amount of received light is output from the light receiver to the reproduction signal processing circuit 28.

  The reproduction signal processing circuit 28 converts a current signal, which is an output signal of the optical pickup 23, into a voltage signal, and based on the voltage signal, a wobble signal, an RF signal including reproduction information, and a servo signal (a focus error signal or a track error). Signal). The reproduction signal processing circuit 28 extracts position information and the like from the wobble signal. The position information extracted here is output to the CPU 40. Further, the reproduction signal processing circuit 28 performs error correction processing or the like on the RF signal and then stores it in the buffer RAM 34 via the buffer manager 37. The focus error signal and the track error signal are output from the reproduction signal processing circuit 28 to the servo controller 33.

  The servo controller 33 generates a control signal for controlling the focusing actuator of the optical pickup 23 based on the focus error signal, and generates a control signal for controlling the tracking actuator of the optical pickup 23 based on the track error signal. Both control signals are output from the servo controller 33 to the motor driver 27.

  The motor driver 27 drives the focusing actuator and tracking actuator of the optical pickup 23 based on a control signal from the servo controller 33. The motor driver 27 controls the spindle motor 22 based on an instruction from the CPU 40. Further, the motor driver 27 controls the seek motor based on an instruction from the CPU 40.

  The interface 38 is a bidirectional communication interface with a host (for example, a personal computer) and conforms to standard interfaces such as ATAPI (AT Attachment Packet Interface), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). is doing.

  The ROM 39 stores a program including a data management information acquisition program, which will be described later, written in a code readable by the CPU 40.

  The CPU 40 controls the operation of each unit according to the program stored in the ROM 39 and temporarily stores data necessary for the control in the RAM 41. When the optical disk device 20 is turned on, the program stored in the ROM 39 is loaded into the main memory (not shown) of the CPU 40.

  Next, data management information acquisition processing in the optical disc apparatus 20 configured as described above will be described with reference to FIG. The flowchart in FIG. 2 corresponds to a series of processing algorithms executed by the CPU 40. In the first embodiment, as an example, a case where there is a request for obtaining track information (the number of tracks, the address of a designated track) in the recording area of the optical disk 15 from the host will be described. In addition, the file system in the optical disc 15 conforms to the sequential UDF standard.

  Here, there are N (3 ≦ N ≦ 191) sessions in the recording area of the optical disc 15, where session 1 is the innermost side and session N is the outermost side. Sessions 1 to (N-1) are closed sessions in which data recording has been completed, and session N is an open session in which data recording has not been completed. Furthermore, in session N, it is assumed that data is recorded in M (<16) fragments.

  It is assumed that SDCB recorded in the lead-in (intro) area of session N has already been copied to RAM 41. This SDCB (hereinafter referred to as “SDCB of session N”) includes the session number of session N, each session information from session 1 to session (N−1) (session number, session start address, session end). Address) and fragment information in the session N (fragment number, fragment start address, fragment end address, etc.) are recorded.

  In step 401 in FIG. 2, it is determined whether there is a track number acquisition request from the host. Here, since there is a track number acquisition request from the host, the determination in step 401 is affirmed, and the routine proceeds to step 403.

  In step 403, the SDCB of the session N stored in the RAM 41 is referred to, and the number of closed sessions in the recording area (hereinafter referred to as “closed session number CS”) is obtained from the session N session number. Since session numbers are assigned in order from the inner circumference side of the recording area, the session number of session N is a value obtained by adding 1 to the number of closed sessions CS in the recording area. That is, the number of closed sessions CS can be obtained by subtracting 1 from the session number of session N.

  In step 405, the SDCB of session N stored in RAM 41 is referred to, and the number of fragments in open session N (hereinafter referred to as “fragment number OSF”) is obtained.

  In step 407, each closed session is regarded as a pseudo track, and a response track number (referred to as AT) as a response to the track number acquisition request is obtained based on the following equation (1).

  AT = CS + OSF (1)

  In step 409, the response track number AT calculated based on the equation (1) is notified to the host. Then, the process proceeds to step 415. In the first embodiment, the number of closed sessions CS is (N−1) and the number of fragments OSF in the open session N is M, so the response track number AT is (N−1 + M). If no open session exists, OSF = 0.

  On the other hand, if there is no track number acquisition request from the host in step 401, the determination in step 401 is denied and the process proceeds to step 415.

  In step 415, it is determined whether there is a request for an address of the designated track from the host. Here, since there is a request for the address of the designated track from the host, the determination at step 415 is affirmed, and the routine proceeds to step 417.

  In step 417, the number of the track designated by the host (hereinafter referred to as “designated track number”) is compared with the number of closed sessions CS to determine whether the designated track number is equal to or less than CS. That is, it is determined whether a pseudo track is designated or a track in the open session N is designated. Here, when a pseudo track is designated, the designated track number is equal to or less than CS, and the determination in step 417 is affirmed. Then, the process proceeds to step 419. In the first embodiment, it is assumed that the track number P is designated.

  In step 419, the start address of session P is extracted with reference to the SDCB of session N stored in RAM 41. Based on the start address of the session P, the SDCB of the session P recorded in the recording area of the optical disc 15 is searched to obtain the start address of the first fragment of the session P and the end address of the last fragment. Further, the start address thus obtained is set as the start address of the designated track P, and the end address is set as the end address of the designated track P. That is, the pseudo track address information is regarded as the address information of the designated track.

  On the other hand, when a track in the open session N is designated in step 417, the designated track number P exceeds CS, so the determination in step 417 is denied. Then, the process proceeds to step 425.

  In step 425, the fragment number FN corresponding to the designated track number P is obtained based on the following equation (2).

  FN = P-CS-1 + OSM1 (2)

  OSM1 in the above equation (2) is the first fragment number in the open session N and can be obtained by referring to the fragment information of the open session N recorded in the RAM 41. Note that the fragment numbers are assigned in order from the first fragment in the session 1. That is, there is no relationship between the fragment number and the session number.

  In step 427, the fragment information of the open session N recorded in the RAM 41 is referred to, the start address of the fragment of the fragment number FN (hereinafter referred to as “fragment FN”) is set as the start address of the designated track P, and the end of the fragment FN The address is the end address of the designated track P.

  In step 431, the address information of the designated track P obtained as described above is notified to the host. Then, the data management information acquisition process ends.

  Next, a processing operation in the case of reproducing data recorded on the optical disc 15 using the above-described optical disc apparatus 20 will be briefly described.

  When the optical disk 15 is inserted (mounted) at a predetermined position of the optical disk device 20, the CPU 40 acquires information on the closed session recorded at the predetermined position of the recording area of the optical disk 15, and based on the information, the final session is obtained. The address of the closed session is extracted, and it is checked whether there is an open session following the final closed session. If there is an open session, the SDCB of the open session is read and copied to the RAM 41. If there is no open session, the SDCB of the last closed session is read and copied to the RAM 41.

  When there is a track information acquisition request from the host, the CPU 40 notifies the host of an answer according to the request content as described above.

  When the CPU 40 receives a reproduction request designating a track from the host, the CPU 40 obtains address information of the designated track in the recording area of the optical disc 15, and uses the start address of the designated track as the reading start position.

  Then, the CPU 40 outputs a control signal for controlling the rotation of the spindle motor 22 based on the reproduction speed to the motor driver 27 and notifies the reproduction signal processing circuit 28 that the reproduction request has been received from the host. When the rotation of the optical disk 15 reaches a predetermined linear velocity, an output signal from the optical pickup device 23 is output to the reproduction signal processing circuit 28.

  The reproduction signal processing circuit 28 acquires position information based on the output signal from the optical pickup device 23 and notifies the CPU 40 of the position information. Further, the reproduction signal processing circuit 28 detects the focus error signal and the track error signal based on the output signal from the optical pickup device 23 and outputs it to the servo controller 33. The servo controller 33 drives the focusing actuator and tracking actuator of the optical pickup device 23 via the motor driver 27 based on the focus error signal and the track error signal from the reproduction signal processing circuit 28, and corrects the focus deviation and the track deviation. To do.

  Based on the position information from the reproduction signal processing circuit 28, the CPU 40 outputs a signal for instructing a seek operation so that the optical pickup device 23 is positioned at the reading start position, to the motor driver 27.

  Based on the position information from the reproduction signal processing circuit 28, the CPU 40 checks whether or not it is the reading start position. If the CPU 40 determines that the position of the optical pickup device 23 is the reading start position, the CPU 40 notifies the reproduction signal processing circuit 28. Notice. Then, the reproduction signal processing circuit 28 detects the RF signal based on the output signal of the optical pickup device 23, performs error correction processing, etc., and then stores it in the buffer RAM 34. Until the reproduction process is completed, the reproduction signal processing circuit 28 detects the focus error signal and the track error signal based on the output signal from the optical pickup device 23 as described above, and the servo controller 33 and the motor driver 27 are turned on. The focus shift and the track shift are corrected as needed.

  The buffer manager 37 transfers the reproduction data stored in the buffer RAM 34 to the host via the interface 38 when the reproduction data is prepared as sector data.

  As is clear from the above description, in the optical disc apparatus 20 according to the first embodiment, the pseudo area setting means, the notification means, the area number acquisition means, and the area number determination are determined by the CPU 40 and the program executed by the CPU 40. Means are realized. Note that at least a part of the processing according to the program by the CPU 40 may be realized by hardware, or all may be realized by hardware.

  In the optical disc apparatus 20 according to the first embodiment, the reproduction signal processing circuit 28 constitutes reproduction means.

  In the optical disc apparatus 20 according to the first embodiment, among the above-described processes performed by the CPU 40, the process shown in the flowchart of FIG. 2 is stored in the ROM 39 as a data management information acquisition program.

  Furthermore, in the optical disc apparatus 20 according to the first embodiment, the CPU 40 executes the data area number determination method and the data management information acquisition method by performing processing according to the data management information acquisition program.

  As described above, according to the data management information acquisition method according to the first embodiment, a closed session is simulated among the sessions included in the recording area in response to a track number acquisition request from the host. Since the number of tracks is calculated by considering it as a track, simply referring to the session number recorded in the SDCB of the last session (the open session N in the first embodiment) You can get the number. That is, since it is not necessary to count the number of all tracks (fragments) in the recording area, the requested information can be quickly acquired in response to the track number acquisition request as compared with the conventional case.

  In the first embodiment, since the number of pseudo tracks, that is, the number of closed sessions is used as an answer to the track number acquisition request, it is not necessary to check the SDCB of all sessions, The number of pseudo tracks can be obtained immediately from only SDCB. That is, the requested information can be quickly acquired in response to the track number acquisition request. Note that write-once information recording media require information on tracks that exist in an open session when recording data, but information on tracks in a closed session that cannot be recorded because the session is closed is important. There is no inconvenience even if the number of closed sessions is the answer to the track number acquisition request.

  In the first embodiment, the total of the number of pseudo tracks and the number of tracks in the open session is used as an answer to the track number acquisition request. Conventionally, in order to count the number of tracks, it is necessary to examine the SDCB of all sessions. Since SDCB of each session is distributed and recorded in the recording area, it takes a lot of time. However, since it is not necessary to count the number of tracks in the closed session here, it is possible to acquire the requested information more quickly than in the past in response to a track number acquisition request.

  Further, in the first embodiment, the pseudo track corresponding to the track number of the designated track, that is, the start address of the first track and the end address of the last track in the session are answered to the track address acquisition request. It is said. Here, since the start address of the first track and the end address of the last track in the closed session can be obtained in a short time, the requested information can be obtained more quickly than before in response to a track address acquisition request. Can be obtained. Note that the write-once information recording medium requires accurate address information of tracks existing in the open session when data is recorded, but recording is not performed in the closed session, and the data is sequential. Therefore, there is almost no benefit of responding with the correct address information of the track in the closed session.

  Further, in the first embodiment, by considering the closed session as a pseudo track, the maximum number of tracks is 206 (= 190 (the number of pseudo tracks) +16 (the number of tracks in the open session)). The information on each track can be stored in the RAM 41 in advance.

In addition, according to the optical disk device according to the first embodiment, in response to a track information acquisition request from the host, an area composed of a plurality of tracks is simulated in a range that does not adversely affect the requested information. By considering it as a track, it is possible to save the trouble of acquiring unnecessary information in response to a request from the host. Therefore, it is possible to reply in a short time to the track information acquisition request from the host.
<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  The second embodiment is characterized in that the data management information acquisition process is different from the first embodiment described above. That is, only the data management information acquisition program stored in the ROM 39 is different, and the configuration of the optical disk apparatus is the same as that of the first embodiment described above. Accordingly, the following description will be focused on the differences from the first embodiment, and the same reference numerals will be used for the same or equivalent components as in the first embodiment, and the description thereof will be simplified or omitted. Shall.

  Data management information acquisition processing in the optical disc apparatus 20 including the ROM 39 in which the data management information acquisition program is stored will be described with reference to FIGS. The flowcharts of FIGS. 3 to 6 correspond to a series of processing algorithms executed by the CPU 40. In the second embodiment, as an example, a case will be described in which there is a request for obtaining session information (number of sessions) and track information (number of tracks, address of a designated track) in the recording area of the optical disc 15 from the host. Further, the preconditions regarding the optical disc 15 are the same as those in the first embodiment described above.

  In step 501 of FIG. 3, it is determined whether or not there is a request for acquiring the number of sessions in the recording area of the optical disc 15 from the host. Here, since there is a request for acquiring the number of sessions from the host, the determination at step 501 is affirmed, and the routine proceeds to step 503.

  In step 503, the number of sessions is acquired. The session number acquisition process will be described with reference to the flowchart of FIG.

  In step 601 of FIG. 4, the number of all sessions in the recording area of the optical disc 15 (hereinafter referred to as “total number of sessions AS”) is acquired by referring to the SDCB of session N recorded in the RAM 41. That is, the session number of the session N recorded in the RAM 41 is set as the total number of sessions AS.

  In step 603, it is determined whether or not the total session number AS exceeds 1. Here, since the total number of sessions AS exceeds 1, the determination in step 603 is affirmed, and the process proceeds to step 605.

  In step 605, (N−2) sessions from session 1 to session (N−2) are regarded as one pseudo session. Since the recording area includes two closed sessions, that is, the pseudo session and the session (N-1), the number of pseudo closed sessions (hereinafter referred to as “the number of pseudo closed sessions SS”). 2).

  In step 607, it is determined whether or not an open session exists in the recording area. That is, by referring to the SDCB of the session N recorded in the RAM 41 and checking whether the session N is an open session or a closed session, the presence or absence of an open session can be easily known. Here, since an open session exists, the determination in step 607 is affirmed, and the process proceeds to step 609.

  In step 609, the number of response sessions (hereinafter referred to as “response session number RS”) as an answer to the session number acquisition request from the host is calculated based on the following equation (3). That is, the response session number RS is a value (= 3) obtained by adding the number of open sessions (= 1) to the number of pseudo closed sessions SS. Then, the session number acquisition process is terminated.

  RS = SS + 1 (3)

  On the other hand, if there is no open session at step 607, that is, if session N does not exist, the determination at step 607 is denied and the routine proceeds to step 611.

  In step 611, the response session number RS is calculated based on the following equation (4). That is, the response session number RS is the same value as the pseudo-close session number SS. Then, the session number acquisition process is terminated.

  RS = SS (4)

  On the other hand, if the total number of sessions AS is 1 in step 603, that is, if only one session exists in the recording area, the determination in step 603 is denied and the process proceeds to step 613.

  In step 613, since there is only one session in the recording area, 1 is set to the number of pseudo-closed sessions SS. Then, the process proceeds to step 611.

  In step 505 of FIG. 3, the response session number RS obtained in the session number acquisition process is notified to the host. Then, the process proceeds to step 507.

  On the other hand, if there is no request for acquiring the number of sessions from the host in step 501, the determination in step 501 is denied and the process proceeds to step 507.

  In step 507, it is determined whether or not there is a request for obtaining the number of tracks in the recording area from the host. Here, since there is a track number acquisition request from the host, the determination at step 507 is affirmed, and the routine proceeds to step 509.

  In step 509, track number acquisition processing is performed. The track number acquisition process will be described with reference to the flowchart of FIG.

  In step 621 of FIG. 5, it is determined whether or not an open session exists in the recording area. Here, since an open session exists, the determination in step 621 is affirmed, and the process proceeds to step 623.

  In step 623, the number of fragments in the open session N (hereinafter referred to as “fragment number OSF”) is obtained by referring to the fragment information of the session N recorded in the RAM 41.

  In step 625, the number of response tracks (hereinafter referred to as “response track number AT”) as a response to the track number acquisition request from the host is obtained based on the following equation (5). That is, the response track number AT is calculated by regarding the pseudo session and the final closed session as pseudo tracks.

  AT = SS + OSF (5)

  In the second embodiment, since the pseudo-close session number SS is 2 and the fragment number OSF in the open session is M, the response track number AT is (M + 2). Then, the track number acquisition process ends.

  On the other hand, if there is no open session in step 621, the determination in step 621 is denied and the process proceeds to step 627.

  In step 627, the response track number AT is calculated based on the following equation (6). That is, the response track number AT is the same value as the pseudo-close session number SS. Then, the track number acquisition process ends.

  AT = SS (6)

  In step 511 of FIG. 3, the response track number AT calculated in the track number acquisition process is notified to the host. Then, the process proceeds to step 513.

  On the other hand, if there is no request for obtaining the number of tracks from the host in step 507, the determination in step 507 is denied and the process proceeds to step 513.

  In step 513, it is determined whether or not there is a request for obtaining address information of the designated track from the host. Here, since there is a request for acquiring address information from the host, the determination in step 513 is affirmed, and the routine proceeds to step 515. Note that, from the host, the track from which the address information is acquired is specified by the track number, as in the first embodiment.

  In step 515, address information acquisition processing is performed. The address information acquisition process will be described with reference to the flowchart of FIG.

  In step 651 in FIG. 6, the designated track number is compared with the pseudo-close session number SS to determine whether the designated track number is equal to or less than SS. That is, it is determined whether a pseudo track (pseudo session or a final closed session) is designated or a track in the open session N is designated. Here, when a pseudo track is designated, the designated track number is SS or less, and the determination in step 651 is affirmed. Then, control goes to a step 653. In the second embodiment, it is assumed that the track number P is specified as an example.

  In step 653, it is determined whether or not the designated track number P is 1. That is, it is determined whether a pseudo session is designated or a final closed session is designated. Here, when a pseudo session is designated, the designated track number P is 1, and the determination in step 653 is affirmed. Then, the process proceeds to step 655.

  In step 655, the start address of session 1 and the end address of session (N−2) are obtained by referring to the SDCB of session N stored in RAM 41. The start address thus obtained is set as the start address of the designated track P, and the end address is set as the end address of the designated track P. Then, the address information acquisition process ends.

  On the other hand, when the last closed session is designated at step 653, the designated track number P is 2, and the judgment at step 653 is denied. Then, the process proceeds to step 657.

  In step 657, referring to the SDCB of session N stored in RAM 41, the start address of the first fragment of session (N-1) and the end address of the last fragment are obtained. The start address thus obtained is set as the start address of the designated track P, and the end address is set as the end address of the designated track P. Then, the address information acquisition process ends.

  On the other hand, when the track in the open session N is designated in step 651, the designated track number P exceeds SS, so the judgment in step 651 is denied. Then, the process proceeds to step 659.

  In step 659, a fragment number FN corresponding to the designated track number P is obtained based on the following equation (7).

  FN = P-SS-1 + OSM1 (7)

  In step 661, the start address of the fragment FN is set as the start address of the designated track P, and the end address of the fragment FN is set as the end address of the designated track P. Then, the address information acquisition process ends.

  In step 517 of FIG. 3, the start address and end address of the designated track P obtained as described above are notified to the host. Then, the data management information acquisition process ends.

  In the optical disc apparatus 20 according to the second embodiment, the data recorded on the optical disc 15 is reproduced based on the designation from the host in the same manner as in the first embodiment.

  As is apparent from the above description, in the optical disc apparatus 20 according to the second embodiment, among the above-described processing performed by the CPU 40, the processing shown in the flowcharts of FIGS. Stored in It should be noted that at least a part of the processing according to the program by the CPU 40 may be configured by hardware, or all may be configured by hardware.

  Furthermore, in the optical disc apparatus 20 according to the second embodiment, the CPU 40 performs the data area number determination method and the data management information acquisition method by performing processing according to the data management information acquisition program.

  As described above, according to the data management information acquisition method according to the second embodiment, in response to a request for acquiring the number of sessions from the host, at least the final closed session among the closed sessions included in the recording area. The closed session except for is regarded as one session. Since the latest file information of the recorded data is recorded at a predetermined position of the final closed session, even if the closed session excluding the final closed session is one pseudo session, it is recorded in the final closed session. The latest file information of recorded data can be read correctly. In particular, in the write-once information recording medium, since data is recorded sequentially, there is no inconvenience even if the closed session other than the final closed session is made one pseudo session in the response to the request for acquiring the number of sessions. Absent.

  In the second embodiment, when a plurality of closed sessions and open sessions are included in the recording area of the optical disc 15, the number of sessions as an answer to the session number acquisition request is 3, and only a plurality of closed sessions are stored. Is included, the number of sessions as a response to the request for acquiring the number of sessions is 2. That is, a value obtained by adding 1 to the number of sessions excluded from a pseudo session among a plurality of sessions in the recording area is used as an answer to the session number acquisition request. Therefore, there is no need to count the number of sessions in the recording area, and the processing can be simplified compared to the conventional method, so that requested information can be acquired quickly in response to a request for acquiring the number of sessions. It becomes.

  Further, in the second embodiment, all the tracks in the closed session except the final closed session are regarded as one pseudo track, and the response to the track number acquisition request is acquired. As a result, the process of obtaining the number of tracks in the pseudo track can be omitted, so that the process can be simplified as compared with the prior art. Therefore, the requested information can be acquired more quickly than in the past in response to an acquisition request for the number of tracks.

  In the second embodiment, when only a plurality of closed sessions are included in the recording area of the optical disc 15 in response to the track number acquisition request, 2 is the number of tracks as a response to the track number acquisition request. When a plurality of closed sessions and open sessions are included, a value obtained by adding 2 to the number of tracks in the open session is used as the number of tracks as a response to the track number acquisition request. As a result, the processing can be simplified, and the requested information can be acquired more quickly than in the past in response to an acquisition request for the number of tracks. Note that the intro and closure have their sector IDs recorded as user data attributes, and logical addresses are assigned to them, so even if multiple closed sessions are regarded as one closed session, there is no inconvenience. No, data can be reproduced normally.

  In the second embodiment, in response to the track address acquisition request, all tracks in the closed session except the final closed session are regarded as one pseudo track, and The start address of the first track and the end address of the last track are used as a track address as a response to the track address acquisition request. As a result, in response to the track address acquisition request, it is possible to acquire the requested information more quickly than in the past. Note that even if the tracks in the closed session other than the final closed session are regarded as one pseudo track, the intro and closure of each session can be correctly recognized. There is no effect.

  As described above, handling of a plurality of closed sessions excluding at least the final closed session as one session and track can further simplify the handling of the session and track. For example, when a plurality of closed sessions excluding the final closed session are regarded as one pseudo session, the maximum number of sessions viewed from the host is 3 (pseudo session + final closed session + open session). Further, for example, when a plurality of closed sessions excluding the final closed session are regarded as a single pseudo track, and the final closed session is also regarded as a pseudo track, the number of tracks viewed from the host is 18 (pseudo The number of tracks is 2 + the number of tracks in the open session 16).

  In addition, according to the optical disk device according to the second embodiment, in response to a request for acquiring data management information from the host, an area composed of a plurality of tracks is simulated within a range that does not adversely affect the requested information. By considering it as a simple track, it is possible to save the trouble of acquiring unnecessary information for the reply to the request from the host. Therefore, it is possible to reply in a short time to the session information and track information acquisition requests from the host.

  In the second embodiment, a case has been described in which a closed session other than only the final closed session among the closed sessions in the recording area is a pseudo session. However, the present invention is not limited to this. For example, the remaining closed sessions excluding a plurality of closed sessions including the final closed session may be set as pseudo sessions.

  Furthermore, in the second embodiment, a case has been described in which a pseudo session and a pseudo track are set by distinguishing the last closed session from the other closed sessions. When the optical disk apparatus 15 can reproduce data recorded in the open session, including the session, it is not always necessary to distinguish the final closed session from the other closed sessions.

  In the second embodiment, the case where a closed session is always included in the recording area has been described. However, only the open session may be included in the recording area. However, in this case, a pseudo session and a pseudo track are not set. In step 625 of FIG. 5, the CPU 40 calculates the response track number AT based on the following equation (8) instead of the above equation (5).

  AT = OSF (8)

  Further, in this case, the CPU 40 sets the value of the pseudo-close session number SS to 0 and performs the address setting process of FIG.

  In each of the above embodiments, a predetermined SDCB is read from the optical disk 15 and copied to the RAM 41 when the optical disk 15 is inserted into a predetermined position of the optical disk device 20, but the SDCB is read when there is an acquisition request from the host. You may read from the optical disk 15. FIG.

  In the optical disk device of each of the above embodiments, the data management information acquisition program is recorded in the ROM 39, but may be recorded in other information recording media (CD-ROM, magneto-optical disk, MO, etc.). good. In short, the data management information acquisition program may be loaded into the main memory of the CPU 40.

  In each of the above embodiments, the case where the optical disk 15 is a DVD + R has been described. However, the present invention is not limited to this, and any information recording medium can be used as long as it can be divided into a plurality of recording areas such as sessions and tracks.

  Furthermore, the optical disk device 20 according to each of the above embodiments may be a so-called built-in type disposed in the same housing as the host, or a so-called external type disposed in a housing separate from the host. It may be.

  In each of the above embodiments, the case where an optical disc apparatus is used as the information reproducing apparatus has been described. Any information reproducing apparatus that can use the recorded information recording medium may be used. Of course, an information recording / reproducing apparatus capable of both reproduction and recording may be used.

  As described above, according to the data area number determination method of the present invention, it is possible to quickly acquire requested information in response to an information acquisition request related to recording of data recorded on an information recording medium. Suitable for Further, the data management information acquisition method of the present invention is suitable for enabling quick acquisition of requested information in response to an acquisition request for information related to recording of data recorded on an information recording medium. . The information reproducing apparatus of the present invention is suitable for responding to an information acquisition request related to recording of data recorded on an information recording medium in a short time.

1 is a block diagram showing a schematic configuration of an optical disc device according to a first embodiment of the present invention. It is a flowchart for demonstrating the data management information acquisition method which concerns on the 1st Embodiment of this invention. It is a flowchart for demonstrating the data management information acquisition method which concerns on the 2nd Embodiment of this invention. It is a flowchart for demonstrating the detail of step 503 of FIG. 5 is a flowchart for explaining details of step 509 in FIG. 3. It is a flowchart for demonstrating the detail of step 515 of FIG.

Explanation of symbols

  15 ... optical disc, 20 ... optical disc device, 40 ... CPU.

Claims (10)

Obtaining the number of sessions for an information recording medium having at least one session in a recording area;
When the number of sessions is greater than 1, the number of sessions as management information related to data recording is determined to be two, and when the number of sessions is 1, as management information related to data recording Determining the number of sessions to 1; and determining the number of data areas. The management information regarding the recording of the data in the information recording medium in which the recording area is divided into a plurality of data areas and the data is recorded for each of the divided data areas is acquired for a response to the data management information acquisition request. A data management information acquisition method,
The recording area includes at least one session including a plurality of tracks as the data area,
In response to the data management information acquisition request,
Obtaining a number of sessions, which is the number of sessions included in the recording area;
Determining whether the session has an open session;
When the open session exists, the closed session among the sessions is regarded as a pseudo track, and the total number of the pseudo track and the number of tracks included in the open session is calculated as the total number of tracks. Process and;
And responding to the data management information acquisition request with the calculated number of sessions, the calculated total number of tracks, and the track address indicating the recording position of the track specified by the track number as the data management information. Data management information acquisition method. A data management information acquisition method for acquiring management information relating to recording of data in an information recording medium in which a recording area is divided into a plurality of data areas and data can be recorded for each of the divided data areas,
The management information includes information regarding the number of the plurality of data areas,
A data management information acquisition method including a step of considering a plurality of data areas excluding at least a final data area among all data areas as a single pseudo data area. 4. The data management information acquisition method according to claim 3 , wherein the final data area is an area where data recording has been completed. 4. The data management information acquisition method according to claim 3 , wherein the last data area is a closed area. An information reproducing apparatus using an information recording medium in which a recording area is divided into a plurality of data areas and data can be recorded for each of the divided data areas,
The recording area includes at least one session including a plurality of tracks as the data area,
In response to a request to obtain data management information related to data recording,
Means for determining the number of sessions, which is the number of sessions included in the recording area;
Means for determining whether the session has an open session;
When the open session exists, the closed session among the sessions is regarded as a pseudo track, and the total number of the pseudo track and the number of tracks included in the open session is calculated as the total number of tracks. With means;
Means for notifying the data management information as a response to the data management information acquisition request, as the data management information, the determined number of sessions, the calculated total number of tracks, and a track address indicating a recording position of a track specified by a track number ; An information reproducing apparatus. An information reproducing apparatus using an information recording medium having at least one session in a recording area,
An area number acquisition means for acquiring the number of sessions;
When the number of sessions is greater than 1, the number of sessions as management information related to data recording is determined to be two, and when the number of sessions is 1, sessions as management information related to data recording Region number determining means for determining the number to be 1;
An information reproducing apparatus comprising: reproducing means for reproducing data based on the management information. The recording area is divided into a plurality of data areas, and management information relating to the recording of the data is obtained in an information recording medium in which data can be recorded for each of the divided data areas, and data is reproduced based on the management information In an information reproducing apparatus that performs
The management information includes information regarding the number of the plurality of data areas,
An information reproducing apparatus characterized in that a plurality of data areas excluding at least a final data area among all data areas are regarded as a single pseudo data area and the management information is acquired. 9. The information reproducing apparatus according to claim 8 , wherein the final data area is an area where data recording has been completed. The information reproducing apparatus according to claim 8 , wherein the final data area is a closed area.

Images