CN100517491C - Method of recording on optical recording medium and apparatus using the same - Google Patents

Abstract

A method and apparatus for recording on an optical recording medium, including recording of management information, which is described as a standard for write-once Blu-ray discs. The management information is recorded in a management area of the optical disc, such as a Temporary Defect Management Area (TDMA), and includes both recording status information and update information. The recording status information is a Space Bit Map (SBM) indicating whether a recording operation has been performed for a predetermined area of the optical disc, while the update information is SBM update information indicating whether the recording status information is to be continuously managed. The SBM update information is recorded in the TDMA and stored in a memory of the optical recording/reproducing device for use in recording and reproducing operations. At the time of recording, the SBM-on state makes it possible to perform a logical overwrite operation when necessary.

Description

Method for recording on optical recording medium and device using the method

Field of invention:

The present invention relates to optical recording media, and more particularly to methods and apparatus for recording on optical recording media, such as write-once blue laser discs (BD-WO), where recording in a random pattern on the optical disc consists of spatial bitmap (SBM ) is managed by record management information so that logical overwrite (LOW) operations can be selectively performed.

Background of the invention:

Data recording devices and media using optical read/write devices are roughly classified according to their writing ability or flexibility. Among read-only optical recording media, those using the CD-ROW and DVD-ROM formats, do not have write capability. Among the known optical disc standards that allow freely performing multiple write operations are CD-RM, DVD-RAM, DVD-RW and DVD+RW, which are writable compact discs and digital versatile discs.

On the other hand, WORM-type optical discs are used as data storage devices requiring high storage capacity. However, this type of optical disc has limitations in recording flexibility, and is used for write-once-read-many applications. These include the CD-R and DVD-R categories, which are recordable compact discs and digital versatile discs.

Meanwhile, new types of high-density DVDs, known as blue laser discs, have been developed, which are high-capacity discs for recording high-quality audio and video data using blue-violet laser light. Blue Laser Discs are in the rewritable disc format, known as BD-RE. The standards for blue laser discs also include those for write-once discs, known as BD-WO discs.

In the aforementioned types of optical recording media, surface imperfections and defects arise during their manufacture, processing or use. Therefore, a method for managing a defective area is used during a data recording operation so that data reproduction can be normally performed.

According to FIG. 1 , an optical recording/reproducing device 100 for use with an optical recording medium 102 such as a BD-RE or BD-WO format optical disc receives data/command input from a host (or controller) 200 . The optical disc recording/reproducing device 100 is configured with an optical pickup 104 for writing data to or reading data from an inserted optical recording medium; a servo 106 for controlling the optical pickup to perform proper tracking while communicating with the surface of the optical recording medium maintain a controlled distance; the data processor 108, processes the transmission to the optical pickup by restoring the reproduced signal received from the optical pickup to an expected signal value or by modulating the recording signal received from the host for transmission to the optical disc data or process data from an optical pickup; an interface 110 for transferring signals between a host computer and a recording/reproducing device; a microcomputer 112 for controlling a recording/reproducing device; and a memory 114 for storing programs and temporarily storing Various types of information including defect management information and data. Under the control of the host computer 200 and the stored program, the optical pickup 104 reads the data stored (or written) on the optical disc, provides data signal input to the data processor 108 for reproduction processing and output, and uses The write signal output writes data to a specific area of the disc. During a write operation, the optical disc recording/reproducing apparatus 100 receives a data stream (or an encoded analog signal) and outputs a write signal to an optical pickup according to a command input via the host computer 200 and a program stored on the memory 114 and executed by the microcomputer 112. 104.

Fig. 2 shows the recording area structure of an optical disc having one recording layer, a BD-RE type optical disc for use with the device of Fig. 1 being divided into assigned areas. The assignment area basically includes a data area set between a lead-in area (LIA) and a lead-out area (LOA). The data area includes an inner spare area (ISA) adjacent to the lead-in area and an outer spare area (OSA) adjacent to the lead-out area.

As described above, the optical disc recording/reproducing device 100 processes input data from the host 200 and writes the data on the optical disc in clusters, which correspond to error correction code group units. If the presence of a defective area is detected in the data area during the writing operation, the optical disc recording/reproducing device 100 performs a series of replacement writing operations, thereby writing data clusters corresponding to the detected defective area into the two spare areas. One (as shown in Figure 2 with ISA as an example). Therefore, by writing the defective area data cluster into the spare area instead of the defective area, data can be read and reproduced from the spare area, so that even when the optical disc is defective in the data area, it is possible to prevent write errors from occurring, thereby ensuring Data security and data integrity.

In addition to writing data clusters in the defect area, location information is recorded in a plurality of defect management areas or DMAs, as defect management information, DMAs include DMA1 and DMA2 arranged in the lead-in area and DMA3 and DMA4 arranged in the lead-out area. The location information includes cluster location information concerning a defective area, its replacement area, and the like, while enabling the defective area to be managed during a recording or reproducing stage.

In the case of a BD-RE disc, since rewriting is possible in an arbitrary recording area of the disc, the entire disc can be used freely regardless of the recording mode. Thus, disc management on BD-RE discs is relatively problem-free. At the same time, BD-WO discs do not have rewriting capabilities, so disc management is more challenging since data recording can only be performed once on any given area of the disc.

In any case, the management of defective areas is crucial during data recording, especially for high-density DVDs such as blue laser discs, but the existing BD-WO standard is insufficient, and this problem Caused by the use of multiple recording layers. There is a need for uniform standards for optical data storage that can accommodate the growing requirements of commercial systems.

Invention content:

Accordingly, the present invention is directed to a method of recording on an optical recording medium, and an apparatus using the same, that substantially solve one or more of the problems caused by limitations and disadvantages of the related art.

The object of the present invention devised to solve the foregoing problems is to provide a method and apparatus for recording on an optical recording medium such as a BO-WO optical disc, whereby recording state information of the optical disc can be recorded and managed in a random recording mode And thus a decision regarding execution of logical rewriting can be made in accordance with the recording state of the optical disc.

Another object of the present invention is to provide a unified standard for write-once optical recording media.

Another object of the present invention is to provide a standard compatible with rewritable optical recording media.

Another object of the present invention is to provide a more efficient method for defective area management during data recording on a write-once optical recording medium.

Another object of the present invention is to provide a recording method on an optical recording medium, with which data security and data integrity can be improved.

Another object of the present invention is to provide a method for recording management information on an optical recording medium, which is applicable to an optical disc having predetermined recording areas on a plurality of recording layers.

Another object of the present invention is to provide a method for recording management information on an optical recording medium, which method can be adaptively applied according to a request from a host.

Another object of the present invention is to provide a method for recording management information on an optical recording medium, which can accommodate successive versions of the medium.

Another object of the present invention is to provide an optical recording medium employing the above method.

Another object of the present invention is to provide a device suitable for the above-mentioned optical recording medium.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent to those skilled in the art from examination of the description or from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the subject matter particularly pointed out in the written description and claims including the appended drawings.

To achieve these objects and other advantages in accordance with the present invention, as embodied and broadly described herein, there is provided a method of recording on an optical recording medium, the method comprising the step of recording management information on the optical recording medium, the management information comprising Recording status information indicating whether a recording operation for a predetermined area of the optical recording medium has been performed is updated simultaneously with information indicating whether the recording status information is continuously managed.

Another aspect of the present invention is to provide a method for recording on an optical recording medium, the method comprising the steps of: recording management information in a management area of the optical recording medium, the management information including information indicating a predetermined area of the optical recording medium Recording state information of recorded/unrecorded state while updating information indicating whether the recording state information is continuously managed; reading in recorded management information; and based on the updated information, determining whether to update the recording state information.

Another aspect of the present invention is to provide a method for recording on an optical recording medium, the method comprising the following steps: recording management information in a management area of the optical recording medium, the management information including indicating that a predetermined area of the optical recording medium has been management information of a recorded/unrecorded state; and when the recording state information indicates a recording state with respect to a predetermined area, a logical rewrite operation is performed.

Another aspect of the present invention is to provide an apparatus for recording on an optical recording medium and reproducing therefrom, comprising: a host computer, which is used to request data to be recorded on a predetermined area of the data area of the recording medium; and recording/reproducing means for processing management information of a recording medium, the management information including information indicating a non-recording/recording state of a predetermined area, wherein the recording/reproducing device determines the recording state of the predetermined area based on the recording state information, and determines Whether to update the recording status information, if it is determined that the predetermined area is a recorded area and the recording status information is to be updated, perform a substitute-recording operation to record data of the predetermined area elsewhere in the data area.

Another aspect of the present invention is to provide an optical recording medium, comprising: at least one recording layer containing a plurality of assigned areas for recording, the assigned areas include a management area, wherein management information is recorded in the management area, and the management information includes Indicates whether a recording operation for a predetermined area of the optical recording medium is performed, and updates information indicating whether recording status information is to be continuously managed.

The following detailed description relates in particular to write-once blue laser discs. However, other write-once optical recording media may also employ the methods and apparatus described in this aspect. Furthermore, although the most suitable optical disc uses the BD-WO format, the basic principles of the present invention can also be employed with optical discs using other formats, including rewritable formats, for enhanced data security and data integrity.

It is to be understood that both the foregoing explanation and the following detailed description of the present invention are exemplary and indicative and provide further explanation for the claims of the present invention.

Description of drawings:

Further objects and advantages of the present invention can be more fully understood from the following description taken in conjunction with the accompanying drawings, in which:

1 is a block diagram of an optical disc recording/reproducing system in the related art;

FIG. 2 is a diagram illustrating a method for managing defective areas of a rewritable optical recording medium, such as a BD-RE disc, for use in the system shown in FIG. 1;

3 is a block diagram of a write-once optical recording medium such as a BO-WO optical disc showing a method of recording management information according to the present invention;

Figure 4 is a diagram of the recording phase of the TDFL sample of Figure 3;

Figure 5 is a diagram of the SBM of Figure 3;

Figure 6 is a diagram of a sample set of SBM update flags included in the TDDS of Figure 3;

7 is a diagram showing a recording operation mode in the process of recording on an optical recording medium according to the present invention, for explaining the relationship between SBM-on/off (SBM-on/off) function and logical rewriting performance Relationship;

8 is a diagram showing another mode of operation in the process of recording on an optical recording medium according to the present invention, for explaining the relationship between SBM-on/off (SBM-on/off) function and logical rewriting performance relationship; and

FIG. 9 is a diagram of an optical recording medium having a plurality of recording layers according to the present invention.

Best practice:

Reference will be made in detail to the preferred embodiments of this invention, examples of which are illustrated in the accompanying drawings. Throughout the drawings the same elements bear the same or similar names.

In general, an overwrite operation is repeated recording in a specific area of a rewritable recording medium, and as such, is an inherent characteristic of a rewritable optical disc. However, in the case of a write-once type optical disc, if there is an already-recorded area in the data area, it is physically impossible to realize the rewriting function in this area due to the inherent characteristics of this optical disc. Therefore, the present invention uses logical overwriting (LOW), as opposed to "physical" overwriting. That is, after determining the use status (ie, recorded or unrecorded) of each of a plurality of assigned areas of the optical disc, logical rewriting is performed as necessary in a specific area of the optical disc according to the present invention. In doing so, the inherent properties of write-once discs are respected. The state of use of an optical disc using the basic principles of the present invention is determined based on a Space Bitmap (SBM) stored in a Temporary Defect Management Area (TDMA).

The terminology used in the following description of the present invention is partly based on conventional usage in the known DVD technology field, and partly is the result of adaptation of new principles of the present invention. For example, the above-mentioned SBM includes bitmap data corresponding to each of a plurality of assigned areas of the optical recording medium, which includes at least one bit for each cluster of the recording area. The present invention also adopts the SBM-on/off function to enable or disable the continuous management (update) of SBM according to user operation, manufacturer's design or host command for the case of recording on a specific area of the disc. The state of the SBM-on/off function is determined for each assigned area of the optical disc based on SBM update information which controls the SBM-update of the corresponding area. Update information is determined according to the first and second embodiments of the present invention.

Referring to Fig. 3, it shows a write-once optical disc with a single recording layer. In addition to the area of the BD-RE optical disc, the BD-WO optical disc adopting the method of the present invention also includes TDMA, which includes TDMA1 arranged in LIA0 and arranged TDMA2 in the outer spare area (OSA0). In the BD-WO according to the present invention, the replacement data corresponding to the defective area is recorded in ISAO and/or OSA0 following the same steps as defect management performed in the BD-RE disc. On the other hand, disc management information is recorded in TDMA. Here, the disc management information is information related to managing defective areas together with other management information necessary to realize the present invention, ie, SBM update information.

A defect management area (DMA) generally includes multiple areas for each recording layer, eg, DMA1, DMA2, DMA3 and DMA4. Upon completion of any recording phase with a write-once disc, the final value of the TDMA information must be transferred to and recorded in the DMA. Therefore, TDMA is temporary DMA.

In the case of a rewritable optical disc, data can be repeatedly written to and erased from the DMA, so proper disc management can be achieved using a relatively small recording area reserved for the DMA. However, in the case of a write-once optical disc, once data is recorded in a certain area, the recording capability of that area is practically destroyed, and any other data can no longer be recorded in the same area. Therefore, a write-once optical disc requires a larger management area.

As shown in FIG. 3, TDMA1 of the optical disc has a fixed size in LIA0, and the size of TDMA2 is related to the size of LOA0. For example, TDMA2 may consist of m clusters, where m=(k×256)/4 and 1≦k≦64 for a single-layer optical disc.

If necessary, disc management information is recorded in each of the above TDMAs within the recording unit, which is defined as one cluster consisting of 32 sectors. Disc management information according to the present invention includes a Temporary Defect List (TDFL), a Space Bitmap (SBM) for determining a disc recording state, and a Temporary Disc Definition Structure (TDDS) updated for each recording situation. TDDS information is prepared by cluster, which is the smallest recording unit, and is recorded along with the update of each TDFL or SBM to include information related to the recording status in addition to conventional disc management information. In this way, for each update, a TDFL and TDDS pair or an SBM and TDDS pair is recorded in the TDMA, so multiple such pairs can be recorded if necessary, each TDFL and TDDS pair occupying j clusters, while each SBM and TDDS pair Occupy a cluster and form the last segment of either pair with TDDS. In doing so, updated TDDS information can be confirmed by reading one end of the recording area within the TDMA. Here, it can be appreciated that the same facilitated TDDS acknowledgment would be accomplished by placing TDDS within sector 0.

FIG. 4 shows a method of recording a TDFL as in FIG. 3 according to the present invention. TDFL is an information list of a series of steps for managing the defective area of the data area replaced (substitute recorded) with the spare area, while, in the case of a single layer, occupies one to four clusters (1≤j≤ 4).

From Fig. 4, every update of TDFL causes other TDFL and TDDS pairs to be recorded in TDMA. Here, assuming, for example, that during the first update, there are records of two defective items (defective item 1 and defective item 2), the second update in which the third defective item is added will produce A TDFL with a third defective entry, thus generating a TDFL including defective entries 1, 2, 3. In the same way, the next TDFL is generated by the execution of the third update to record the updated TDFL including defective items 1, 2, 3 and 4. By accumulating recording defect items in this way, a complete table of defect items on the entire optical disk can be determined by confirming the final TDFL, thereby simplifying the recording operation. In this way, as long as the final TDFL remains valid, defective items can be safely identified even if the defect has occurred in one or more of the preceding recorded TDFLs, for example, in the first or second updated TDFL.

The SBM of FIG. 3 is used to determine the usage status of the optical disc, and includes information applicable to the entire recording area of the optical disc. One bit of the SBM is assigned to each cluster for expressing whether the corresponding cluster is a recorded area or an unrecorded area. Thus, a recorded area can be identified by the bit value "1b" and an unrecorded area can be identified by the bit value "0b", and vice versa. Therefore, by reading the SBM, recorded areas and unrecorded areas of the entire optical disc can be identified.

That is to say, the method of the present invention can identify one or more recorded areas and one or more unrecorded areas by simply reading in the SBM, and at the same time can determine the recording status of each area of the optical disc regardless of the order of recording, in other words That is, even when recording is performed in an unordered manner as in random recording mode. Therefore, if information is to be freely recorded on a write-once disc, SBM management is necessary.

Referring to FIG. 5, the SBM is composed of three main fields, including a header identifying the SBM, data describing the SBM itself, and a termination part specifying the end of the SBM. The header includes recording layer information naming the recording layer, ie, L1 or L0, so that the current SBM of all areas of the multi-layer disc can be specified. The SBM is prepared (that is, recorded) according to each area of the optical disc, whether it is a single-layer optical disc or a multi-layer optical disc, and includes start position information, that is, the first physical sector number of the starting cluster, length information, bitmap Data and reserved fields. In this way, the TDDS is updated whenever the recording status of a specific area of each recording layer changes and whenever it is expected that the recording needs to be updated. Importantly, the determination as to whether to update the SBM of a given area can be performed when required by the user, disc manufacturer, host/controller (hereinafter referred to as host).

According to a first preferred embodiment of the present invention, the state of the SBM-on/off function is determined by SBM information including start position information and length information of a given area of the optical disc. The SBM-on state of a region enables SBM-updates for that region. Here, the SBM-update is performed using the bitmap data of the area, which is applied according to the stored values of the start position and length of the corresponding area. In order to set this SBM-ON/OFF function to "OFF" to disable the SBM-update of a certain area, the start position information and length information of the area are set to specific values, for example, zero.

From the above, the SBM-on/off function according to the present invention quickly adapts to various range requests from the host. For example, if real-time recording is required on a BD-WO disc, defect management is not performed. In this way, the spare area is not used for replacement-recording and no SBM-update of the spare area is required. In this case, only the user data area is managed continuously, other areas do not need to perform SBM-update. Here, it can be recognized that if the SBM is updated as long as the disc management information in the management area (non-user data area) changes, which is often the case, then due to the size limitation of the SBM recording area, the Continuous SBM-updates will soon become impossible, said SBM recording area being located in TDMA in one embodiment of the invention. In turn, in the case of discontinuous SBM-updates, management of further recording status using SBM information will become impossible in all areas, including in the user data area. Therefore, since this user data area definitely requires the existing SBM to perform logical rewriting, areas such as the management area should preferably be removed from the SBM-update operation in order to reserve updates for this user data area. In order to execute this recording scheme according to the host command, the SBM-on/off function can be used to perform only the SBM-update of the user data area, whereby the start position information of each area not to be updated and The length information is set to zero, and SBM-updates are disabled for all other areas (ie areas other than those to be updated). It can be understood that the present invention is not limited to any example of applying the SBM-on/off function according to the assigned area of the optical disc, such as the above-mentioned examples, and the SBM-on/off function of the present invention is adaptable and optional, enabling the system designer to Pre-determined assignments of disc regions program any desired combination of SBM-on to SBM-off states.

According to the second preferred embodiment of the present invention, the state of the SBM-on/off function is determined by a set of SBM update identifications recorded in the TDDS, wherein one SBM update is assigned to each assigned area of the optical disc. The SBM update flag can be applied together with the start position information and length information for each area (each in the first embodiment) or can also be applied independently. The SBM update identifier can be represented by one byte, so in a two-layer optical disc divided into eight regions, each region will be allocated one bit. Thus, one of two values will be assigned to each field to indicate the state of the field, ie whether or not the field will be updated.

Referring to FIG. 6 , it is an example of the SBM update identifier of the TDDS, the value of "0b" is recorded in the area that will be continuously updated, and the value of "1b" is recorded in the area where the update is not being performed. Thus, in a dual-layer disc, assuming that the host commands SBM-update only to the user data area, the recording of various SBM update flags can update the user data area (set to "on") while disabling the remaining areas Update (set to "Off"). Specifically, flags b2 and b5 are both "on" and flags b0, b1, b3, b4, b6 and b7 are all "off". When the optical disc with the above-mentioned SBM update identification is put into the optical disc recording/rewriting device, the identification is read to determine whether to update the SBM of a specific area on the optical disc.

In addition to the above-mentioned set of SBM update identifiers, the recording disc management information included in the TDDS of FIG. 3 also includes the first physical sector number of each of the last TDFL and the last SBM. Including the first physical sector number of the last TDFL and the last SBM, so that their respective positions can be ascertained by reading in the TDDS, and the currently known defect areas and the use status of the optical disc can be detected. Here, the first physical sector number is the address of the first sector in the corresponding cluster and generally occupies four bytes, while the last TDFL or SBM includes the latest update information.

The disc management information recorded in the TDDS further includes the first physical sector number of usable (useful) clusters for optimal power calibration (OPC), which is used by the disc recording/rewriting device to perform test write and read operations to determine The most efficient laser power setting for recording, and this is always required. Therefore, irrespective of the state of SBM-update (on or off), the number of the first physical sector of the available OPC cluster is included to accommodate the case where SBM-update is only available for the user data area, in which case the user data OPC clusters outside the zone (eg, within LIAO) can be excluded from SBM-update. By always recording this information in TDDS, the OPC cluster can be accessed at any desired moment, even if SBM-updates are disabled for the corresponding area.

Figures 7 and 8 respectively show the recording operation modes on a write-once optical recording medium such as a BD-WO disc according to the present invention to illustrate the relationship between SBM-on/off function and logical rewrite performance . Here, the example of FIG. 7 considers an optical disc format in which the size of the spare area is fixed regardless of the recording operation, and the example of FIG. 8 considers an optical disc format in which the size of the spare area is adaptive according to the data recording operation.

As shown in FIGS. 7 and 8, if a recording command from the host requests data recording on a certain recorded area A-B, a replacement recording operation for data is required, whereby using a logical rewrite operation according to the present invention will expect The data of is recorded in an optional area of the data area, that is, in the replacement area A'-B'. In this way, even in the case of a write-once disc, the host can command recording regardless of whether a specific area of the disc has actually been recorded, so that the write-once disc can emulate the performance of a rewritable disc by logical rewriting.

In the process of executing the recording command on the above-mentioned recorded area A-B, the first step is to read the SBM to confirm the use status of this area, ie, it has been recorded. If "overwrite" is requested, data is replaced-recorded in the data area of the replacement area A'-B', and corresponding defect management information is recorded in TDMA as TDFL information to complete the desired recording command. Therefore, if the host desires to reproduce the A-B data of the optical disc recorded as above, the above-mentioned optical disc recording/reproducing device refers to the recorded defect management information and reproduces the data stored in the A'-B' area instead of the data stored in the A-B area.

Before performing a logical overwrite operation using the method of the present invention, the existing recording state in the corresponding area of the optical disc must be accurately determined. That is to say, logical rewriting cannot be completed without continuously updating the disc management information (ie, the existing SBM).

One mode of operation, corresponding to the Figure 7 example, is summarized in Table 1.

Table 1

As shown in Table 1, logic rewriting can only be performed when the SBM update flag is "on", so that it can be continuously updated. This "logical overwrite" replaces the recorded data, ie the LOW data, and is thus recorded in the user data area, preferably at the end of the user data area. Here, the availability of the assigned spare area ("Yes" or "No") determines whether defect management is permitted, but the SBM update flag ("On" or "Off") determines whether logical rewriting is permitted.

Another mode of operation, corresponding to the example of Fig. 8, is summarized in Table 2.

Table 2

As shown in Table 2, logic rewriting can only be performed when two conditions are met at the same time, that is, the SBM-on/off function is available, that is, setting it to "on" enables it to be continuously updated, and the assigned spare area is available at the same time. Thus, the spare area can be used for LOW data as well as for recording replacement clusters during disc defect management. Here, the recording state is confirmed only when the SBM-ON/OFF function is "ON", while logical rewriting is performed only when the assigned spare area exists.

Fig. 9 shows the SBM-on/off function according to a preferred embodiment of the present invention. SBM-on/off function determined with respect to each of a plurality of assigned areas on an optical disc having a plurality of recording layers L0 and L1, said each recording layer comprising an inner area, an inner spare area, a user area, an outer spare area and external areas. In the case of the above-mentioned dual-layer disc, the inner area of the first recording layer L0 becomes the lead-in area, while the inner area of the second recording layer L1 becomes the lead-out area. This is in contrast to the case of single-layer discs, the outer area of which is defined as the lead-out area. In one configuration of the above-mentioned BD-WO disc, the size of ISA1 is p×256 clusters, where 1≦p≦64, while the size of OSA1 is q×256 clusters, where 1≦q≦32.

The start position and recording direction of each zone are shown for the preferred solution to provide valid recording. It should be noted that the starting position of each area is determined according to its recording direction, and any change in the recording direction of any area will change the starting position of the area accordingly.

In a device using the method of the present invention, such as the optical disc recording/reproducing device 100 shown in FIG. 1, when an optical disc recording medium such as a BD-WO disc is inserted into the device, all existing disc management information is first read out and stored in memory 114 for use during disc recording and/or reproducing operations. In this way, the SBM and the SBM update identifier are included in the stored disc management information. Data is recorded in a specific area of the optical disc by a command from the host 200, and location information of the area, ie, start position and length information, is input into the optical disc recording/reproducing apparatus 100 together with the data to be recorded. The microcomputer 112 receives the recording command, and determines whether the area to be recorded is a recorded area or an unrecorded area based on the disc management information stored in the memory 114 according to the position information. The microcomputer 112 then determines whether to update the SBM of this specific area based on the recording status of the specific area. If the SBM-ON/OFF function is "ON" in this area and has recorded status at the same time, the replacement-recording for the defective area will be carried out in the data area elsewhere, as shown in Figures 7 and 8, and then update the SBM.

In the case of FIG. 8, however, replacement-recording is performed in the spare area of the data area. Therefore, in the case where the SBM-on/off function state is "on" only in the user data area, that is, the spare area is in the SBM-off state, SBM-update is not performed in the spare area.

It should be noted that, according to the present invention, both or one or the other of the SBM information (in particular, starting position information and length information) and the SBM update identifier can be stored in the memory 114 of the above-mentioned device, It can be accessed and used as necessary during operation. In doing so, the methods described in accordance with the first and second embodiments of the present invention may be implemented, separately or together as desired.

Industrial application:

As described above, by employing the method and apparatus of the present invention, recording state information of an optical recording medium such as a dual-layer BD-WO disc can be recorded and managed in a random recording mode. A decision to perform logical rewriting is then made based on the recording state of the optical disc. The disclosure of the present invention can be used as a unified standard for write-once optical recording media, and it is even compatible with rewritable optical recording media at the same time, providing more efficient defect area management during data recording on write-once optical recording media. method to enhance data security and integrity. The SBM-on/off function can be selectively applied for each area of the disc in response to any request from the host. In addition, by adopting the present invention, the write-once optical disc can emulate the characteristics of a rewritable optical disc through a logical overwriting operation, thereby replacing-recording data in a defective area. This replacement-recording can be performed in either the management area or the user data area, thereby being able to accommodate successive versions of the medium.

Various modifications and variations of the present invention will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.

Claims (32)

1. method that is used at recording data from optical recording medium, described optical record medium comprises the data field with user data area and non-user data area, and described user data area is made up of a plurality of record cells, and this method comprises the steps:

Records management information in the directorial area of optical record medium, this management information comprises

Data bitmap, whether each record cell that it indicates described user data area recorded data, and

Start position information, it indicates total start address of the applied user data area of described data bitmap.

2. the method for claim 1 is characterized in that, described optical record medium is a recordable optical recording medium.

3. the method for claim 1, it is characterized in that, described data bitmap is made up of a plurality of bits, and each in these a plurality of bits is assigned to the smallest record unit of described user data area, and the bit of this distribution is indicated whether recorded data of this smallest record unit.

4. the method for claim 1 is characterized in that, described record cell is bunch.

5. the method for claim 1 is characterized in that, described management information further comprises the non-user data area information of presence bit diagram data whether that is used to indicate described recording medium.

6. the method for claim 1 is characterized in that, described management information further comprises the positional information of first available area that is used to carry out the optical power calibration.

7. the method for claim 1, it is characterized in that, described optical record medium comprises first recording layer and second recording layer, and described management information comprises first data bitmap that is used for the described first recording layer user data area and second data bitmap that is used for the described second recording layer user data area.

8. method as claimed in claim 7 is characterized in that described management information comprises a layer information, and this layer information is used to indicate the applied recording layer of described data bitmap.

9. the method for claim 1 is characterized in that, described management information comprises the positional information that is recorded in the data bitmap in the described directorial area recently.

10. device that is used at recording data from optical recording medium, this optical record medium comprises the data field with user data area and non-user data area, and described user data area is made up of a plurality of record cells, and described device comprises:

Pick-up is configured at described recording data from optical recording medium; And

Microcomputer operationally is coupled to described pick-up, and comprises that a module, this module are configured to control described pick-up with records management information in the directorial area of described optical record medium, and this management information comprises:

Data bitmap, whether each record cell that is used to indicate described user data area recorded data; And

Start position information is used to indicate total start address of the applied user data area of described data bitmap.

11. device as claimed in claim 10 is characterized in that, described optical record medium is a recordable optical recording medium.

12. device as claimed in claim 10, it is characterized in that, described data bitmap is made up of a plurality of bits, and each in these a plurality of bits is assigned to the smallest record unit of described user data area, and the bit of this distribution is indicated whether recorded data of this smallest record unit.

13. device as claimed in claim 10 is characterized in that, described record cell is bunch.

14. device as claimed in claim 10 is characterized in that, described management information also comprises the non-user data area information of presence bit diagram data whether of indicating described recording medium.

15. device as claimed in claim 10 is characterized in that, described management information also comprises the positional information of first available area that is used to carry out the optical power calibration.

16. device as claimed in claim 10, it is characterized in that, described optical record medium comprises first recording layer and second recording layer, and described management information comprises first data bitmap that is used for described first recording layer and second data bitmap that is used for described second recording layer.

17. device as claimed in claim 16 is characterized in that, described management information comprises a layer information, and this layer information is used to indicate the applied recording layer of described data bitmap.

18. device as claimed in claim 10 is characterized in that, described management information comprises the positional information that is recorded in the data bitmap in the described directorial area recently.

19. device as claimed in claim 10 is characterized in that, this device also comprises:

Main frame, it comprises a module, this module is configured to send record order by an interface unit to described microcomputer.

20. one kind is used for from the optical record medium method of reproducing data, described optical record medium comprises the data field with user data area and non-user data area, and described user data area is made up of a plurality of record cells, and this method comprises the steps:

From the directorial area playback management information of described optical record medium,

Wherein, described management information comprises:

Data bitmap, whether each record cell that it indicates described user data area recorded data, and

Start position information, it indicates total start address of the applied user data area of described data bitmap.

21. method as claimed in claim 20, it is characterized in that, described data bitmap is made up of a plurality of bits, and each in these a plurality of bits is assigned to the smallest record unit of described user data area, and the bit of this distribution is indicated whether recorded data of this smallest record unit.

22. method as claimed in claim 20 is characterized in that, described record cell is bunch.

23. method as claimed in claim 20, it is characterized in that, described optical record medium comprises first recording layer and second recording layer, and described management information comprises first data bitmap that is used for the described first recording layer user data area and second data bitmap that is used for the described second recording layer user data area.

24. method as claimed in claim 23 is characterized in that, described management information comprises a layer information, and this layer information is used to indicate the applied recording layer of described data bitmap.

25. method as claimed in claim 20 is characterized in that, described management information comprises the positional information that is recorded in the data bitmap in the described directorial area recently.

26. a device that is used for reproducing from optical record medium data, described optical record medium comprises the data field with user data area and non-user data area, and described user data area is made up of a plurality of record cells, and this device comprises:

Pick-up is configured to reproduce data on described optical record medium; And

Microcomputer operationally is coupled to described pick-up, and comprises that a module, this module are configured to control described pick-up with playback management information in the directorial area of described optical record medium, and this management information comprises:

Data bitmap, whether each record cell that is used to indicate described user data area recorded data; And

Start position information is used to indicate total start address of the applied user data area of described data bitmap.

27. device as claimed in claim 26, it is characterized in that, described data bitmap is made up of a plurality of bits, and each in these a plurality of bits is assigned to the smallest record unit of described user data area, and the bit of this distribution is indicated whether recorded data of this smallest record unit.

28. device as claimed in claim 26 is characterized in that, described record cell is bunch.

29. device as claimed in claim 26, it is characterized in that, described optical record medium comprises first recording layer and second recording layer, and described management information comprises first data bitmap that is used for described first recording layer and second data bitmap that is used for described second recording layer.

30. device as claimed in claim 29 is characterized in that, described management information comprises a layer information, and this layer information is used to indicate the applied recording layer of described data bitmap.

31. device as claimed in claim 26 is characterized in that, described management information comprises the positional information that is recorded in the data bitmap in the described directorial area recently.

32. device as claimed in claim 26 is characterized in that, this device also comprises:

Main frame, it comprises a module, this module is configured to send the reproduction order by an interface unit to described microcomputer.

Images