JPH0773607A - Optical disk device - Google Patents

Abstract

PURPOSE:To ensure the reproduction of DDS further by recording the reproducing control data (DDS) of remaining sectors on the sector of at least one piece or above dividing a recording area and alternately processing the DDS recording sector by a low standard. CONSTITUTION:The recording area of an optical disk 2 is divided to plural sectors beforehand, and the DDS are recorded on the sector of at least one piece or above. The DDS are reproduced, and are processed by an error detection/correction circuit 11 to be stored in a buffer 13. Then, when the number of bit errors of the reproducing DDS become a reference value or above lower than the other data set by a system control circuit 9, the DDS sector is processed alternately by the circuit 9. Thus, the DDS sector is alternated in the state where no deterioration becomes larger, and the reproduction of the important data of the DDS, etc., are ensured further.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problem to be Solved by the Invention Means for Solving the Problem (FIGS. 1 to 3) Action (FIGS. 1 to 3) Example (1) Configuration of Example (FIG. (FIG. 3) (2) Effect of the embodiment (3) Other embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
For example, it can be applied to an optical disk device used as an auxiliary storage device of a computer.

[0003]

2. Description of the Related Art Conventionally, there is an optical disk device of this type which can be used as an auxiliary storage device such as a computer.

In other words, an optical disk applied to this type of optical disk device can be mass-produced by applying a manufacturing method similar to that of the compact disk, whereby a large amount of large-capacity data can be supplied. Therefore, if this type of optical disk device is used as an auxiliary storage device for a computer, text data such as a dictionary with a large amount of data can be supplied simply and in large quantities, and this allows connection to the computer and usability of the computer. Is designed to be able to improve.

[0005]

By the way, in this type of recording medium, the structure data (D
DS (disk deifinition sutrucyure) is recorded, and the zoning of the recording area, the replacement sector, etc. are represented by this structural data. As a result, in this type of recording medium, the remaining sectors can be recorded / reproduced with reference to this structure data, and if this structure data cannot be reproduced, the entire recording medium cannot be used. .

Therefore, in this type of recording medium, this structure data is double recorded on the inner and outer circumference sides, and even if a defect or the like occurs in one sector, the structure data recorded in the other sector is recorded. By reproducing, the remaining sectors can be surely reproduced.

If this important structural data can be reproduced more reliably, it is considered that the reliability of this type of optical disk device can be improved and the usability can be improved.

The present invention has been made in view of the above points, and is intended to propose an optical disk device capable of more reliably reproducing important data such as structural data representing the structure of a disk. Is.

[0009]

In order to solve such a problem, in the present invention, in response to a predetermined control command,
The disk-shaped recording medium 2 is irradiated with a light beam to record desired data D0 to D511 on the disk-shaped recording medium 2, and the reflected light of the light beam is received to record the data D0 to D511 on the disk-shaped recording medium 2. In the optical disk device 1 for reproducing data, the recording area of the disk-shaped recording medium 2 is divided into sectors, at least one of the sectors is assigned to a recording sector of the management data DDS, and the remaining sectors are recorded in the recording sectors of the management data DDS. Recording management data DDS necessary for reproducing the data, identification data VU1 to VU4 of the recording sector of the management data DDS, and management data DD
S and identification data VU1 to VU4, error detection and correction codes ECC1,1 to ECC5,16 are recorded, and management data D
When reproducing the DS, the recording sector of the management data DDS is replaced based on the error correction processing result of the management data DDS.

Further, in the second invention, the optical disk device 1 searches the recording sectors of the management data DDS by searching the identification data VU1 to VU4 at the time of starting.

[0011]

The management data DDS necessary for reproducing the remaining sectors is recorded in the recording sector of the management data DDS, and the recording sectors of the management data DDS are identified by the identification data VU1 to VU.
If it can be identified by 4, the recording sector of the management data DDS is replaced based on the error correction processing result of the management data DDS, and the reliability of the disk-shaped recording medium can be improved.

That is, in the optical disk device 1, at the time of start-up, the identification data VU1 to VU4 are searched to detect the recording sector of the management data DDS, and even if the replacement processing is performed, the sector of this management data DDS is surely detected. Can be detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Configuration of Embodiment In FIG. 1, reference numeral 1 indicates an optical disk device as a whole,
The desired data is recorded / reproduced by using the recordable / reproducible optical disk 2, and further the desired data is reproduced from the reproduction-only optical disk 2.

In other words, the optical disk device 1 is produced by applying a thermomagnetic recording method to record / reproduce desired data and a method similar to that of a compact disk. A read-only ROM (read-only memory) disk is also applicable. The optical disk device 1 drives the spindle motor S by the spindle motor control circuit 3 to rotationally drive the optical disk 2 at a predetermined rotation speed.

In this state, the laser control circuit 4 drives the laser diode incorporated in the optical pickup 5 to irradiate the optical disk 2 with a light beam. The optical pickup 5 receives the reflected light of this light beam by a predetermined light receiving element and outputs the light receiving result to the RF signal processing circuit 6.

The RF signal processing circuit 6 performs current-voltage conversion processing on the received light result, and then performs addition / subtraction processing by a predetermined matrix circuit to obtain the tracking error signal TE,
The focus error signal FE is generated, and the tracking error signal TE and the focus error signal FE are output to the servo control circuit 7. As a result, the optical disk device 1
With the servo control circuit 7, the tracking error signal TE,
By moving the optical pickup 5 and the objective lens built in the optical pickup 5 on the basis of the focus error signal FE, tracking control and focus control can be performed.

In addition to this, the servo control circuit 7 is adapted to move the optical pickup 5 in the radial direction of the optical disc in response to a control command output from the system control circuit 9, whereby the optical disc device 1 is moved. , The optical disk 5 is sought to access the optical disk 2. Further, the RF signal processing circuit 6 performs the addition / subtraction processing on the light reception result, and the signal level changes according to the change of the reproduction signal (which is a so-called sum signal) whose signal level changes according to the amount of reflected light and the polarization plane of the reflected light. And a reproduction signal (which is a so-called difference signal) that changes.

As a result, when reproducing the optical disk 2 which is a ROM disk, the optical disk device 1 reproduces desired data by binarizing this sum signal and then processing it in the subsequent data modulation / decoding circuit 8. To be able to
Further, the address data of the reproduction position (that is, a physical address) can be detected. On the other hand, when the optical disc device 1 reproduces the optical disc 2 which is a magneto-optical disc, after binarizing this difference signal,
The subsequent data modulation / decoding circuit 8 processes it so that desired data can be reproduced, and the sum signal is further taken in at a predetermined cycle and processed so that the address data at the recording / reproducing position can be detected. ing.

Thus, the system control circuit 9 can seek the optical pickup 5 by issuing a control code to the servo control circuit 7 on the basis of the address data thus detected.

The data modulation / decoding circuit 8 obtains reproduced data by binarizing the reproduced signal output from the RF signal processing circuit 6 and then 7-2 demodulating the reproduced signal. The reproduced data is buffered. Output to the control circuit 10. At this time, the error detection / correction circuit (ECC) 11 performs error correction processing on the reproduction data by using the error detection / correction code reproduced together with the reproduction data, whereby the optical disk device 1 surely obtains desired data. It is designed to be playable.

At the time of this error correction processing, the error detection / correction circuit 11 outputs the error correction result to the system control circuit 9,
As a result, the system control circuit 9 determines whether or not the desired data has been correctly reproduced, issues a control code as necessary, and repeats the reproduction operation. Further, when an error occurs in the reproduced data, the system control circuit 9 causes the SCSI (smal
l computer system interface) The host computer is interrupted via the interface circuit (I / F) 12, and an error code indicating that an error has occurred is issued to the host computer.

The buffer control circuit 10 sequentially inputs the reproduced data reproduced in this way and stores the reproduced data in the buffer memory 13. The reproduced data stored in the buffer memory 13 is sent from the SCSI interface circuit 12 to the host at a predetermined timing. Output to the computer. The system control circuit 9 is the SCSI interface circuit 1
By controlling the entire operation in response to a control command issued from the host computer via 2, the optical disk device 1 is configured to execute the series of reproduction processes. It is adapted to output a large amount of data to the host computer.

On the other hand, when a write control command is issued from the host computer with the optical disk 2 made of a magneto-optical disk loaded, the system control circuit 9 switches the entire operation mode to the recording mode. .
In response to this, the buffer control circuit 10
Input data input via the SI interface circuit 12 is stored in the buffer memory 13 and output to the data modulation / decoding circuit 8 at a predetermined timing.

At this time, the error detection / correction circuit 11 generates an error detection / correction code of this input data and outputs it to the data modulation / decoding circuit 8, and the data modulation / decoding circuit 8 receives this input data and the error detection / correction code. 2-7 is modulated and converted into recording data. The RF signal processing circuit 6 forms a reference clock for recording on the basis of the reproduction result composed of the sum signal, and outputs this reference clock to the laser control circuit 4.

The laser control circuit 4 drives the optical pickup 5 in synchronization with the reference clock to switch the light amount of the light beam to the light amount at the time of recording and intermittently irradiate the light beam. As a result, the optical disk device 1 applies a modulation magnetic field to the irradiation position of this light beam,
By switching the polarity of this modulating magnetic field according to the recording data, the method of thermomagnetic recording can be applied to record desired data.

(1-1) System Control Circuit The system control circuit 9 reproduces the structure data from a predetermined sector in advance when reproducing the optical disk 2 in this way, and the structure data thus reproduced remains as a reference. The sector is recorded and reproduced.

That is, in this type of optical disc 2, the recording area is divided into sector units, and data is recorded in each sector according to the format shown in FIG. Here, this format is an ISO (internatinal stand) for an optical disc 2 having a diameter of 3.5 inches.
ards organization), one sector is formed by 525 bytes of data.

In each sector, a 512-byte area of D0 to D511 is assigned to user data, and subsequent VU1 to VU are assigned.
The 4 bytes of U4 are allocated to vendor-unique data, and in the optical disc device 1, this vendor-unique data can be freely set when the optical disc 2 is created. Further, in each sector, 5 bytes of CRC1 to CRC4 are assigned to the parity code, and the remaining E1,1 to E5,16 are 5 ×.
16 bytes are allocated to the code for error detection and correction.

Accordingly, in the optical disc device 1,
When a read command is issued via the SCSI interface circuit 12, the optical disk 2 is reproduced in sector units, and 512 bytes of data allocated to user data out of 525 bytes of one sector is subjected to error detection and correction processing. It is designed to output.

For this sector, the system control circuit 9
Records the structural data in predetermined sectors on the inner and outer circumference sides of the optical disk 2, and executes the processing procedure shown in FIG. 3 when the power is turned on to search for the structural data based on the vendor unique data. . That is, when the power is turned on or the reset operation is performed, the system control circuit 9 shifts from step SP1 to step SP2 and sets the value 0 to the logical sector of the target sector representing the reproduction target.

Subsequently, the system control circuit 9 proceeds to step S
After moving to P3, the target sector of the logical sector 0 is reproduced, and then a predetermined arithmetic process is executed on the vendor-unique data VID of the reproduced sector to determine whether or not this data VID has a predetermined value C. Here, in this embodiment, the optical disc 2 sets the vendor-unique data VID to a predetermined value C for the sector in which the structural data is recorded, so that it can be easily distinguished from other user data. There is.

As a result, when the system control circuit 9 obtains a negative result in step SP4, step SP4
5, the logical sector of the target sector is incremented by the value 1, and the process returns to step SP3. As a result, the system control circuit 9 causes the steps SP3-SP4.
-By repeating the processing procedure of SP5-SP3, the sectors of the optical disk 2 are sequentially reproduced from the logical sector 0 to search for the sector in which the structural data is recorded.

When the sector in which the structure data is recorded is reproduced in this way, a positive result is obtained in step SP4, and therefore the system control circuit 9 moves to step SP6 and the structure data (that is, DD) recorded in this sector.
Based on the information of S), the parameters for replacement sector detection are set. As a result, the optical disk device 1
By accessing the optical disc 2 based on the set parameters, desired user data can be recorded on the optical disc 2, and the data recorded on the optical disc 2 can be reproduced. ing.

When the structure data is reproduced in this way,
The system control circuit 9 then moves to step SP7,
Here, based on the processing result of the error detection / correction circuit 11, it is judged whether or not the number of errors when reproducing this structure data is equal to or more than a predetermined prescribed value N. If a positive result is obtained in step SP7, the system control circuit 9 proceeds to step SP
8, the replacement process is executed for the sector in which the structure data is recorded, and the process proceeds to step SP9, whereas when a negative result is obtained, the process directly proceeds to step SP9.

As a result, the system control circuit 9 outputs the control code to the buffer control circuit 10 and the like, and re-records the structure data immediately after reproduction stored in the buffer memory 13 in the alternate sector of the optical disk 2. Therefore, for this important data, when the bit error rate becomes equal to or lower than the predetermined value N, the replacement process is automatically executed. As a result, in the optical disk 2, when a sector occurs in the structure data and the error rate deteriorates, the replacement process can be executed to always keep the structure data in a state where the structure data can be surely reproduced. Thus, the reliability of the optical disk device 1 is improved.

At this time, the system control circuit 9 sets the reference value N so that the replacement process is executed at a small bit error rate, as compared with the case where an error message is sent out for normal user data to prompt the user for the replacement process. It is chosen so that in such important data, it can always be reliably reproduced. That is, in the 3.5-inch optical disk 2 defined by this kind of ISO, it is possible to correct a bit error of 40 bytes or less per sector for a burst-like bit error, and one series (in the vertical direction in FIG. D0, D5, ... D
Bit error (of 511 data strings) can be corrected with a bit error of 8 bytes or less.

On the other hand, the system control circuit 9 executes the alternation process when a bit error of 20 bytes or more occurs in a burst form or when a bit error of 4 bytes or more in one series occurs. As a result, the replacement process is automatically executed at a bit error rate smaller than that of normal user data, so that the structure data can be surely reproduced. At the time of this replacement processing, the system control circuit 9 sets vendor-unique data to a predetermined value C for a sector for newly recording structure data, whereas it sets a sector unique to the structure data up to a predetermined value C. This vendor-unique data is set to a value other than the predetermined value C. This enables the optical disc device 1
In the case of starting, even if the sector of the structure data is replaced, the structure data can be reliably detected based on the vendor unique data.

Thus, when the system control circuit 9 executes the replacement process, the system control circuit 9 moves to step SP9 and then switches to the state of waiting for a command input from the host computer, and then moves to step SP10 to complete this processing procedure. .

(2) Effects of the Embodiments According to the above-mentioned configuration, the structural data can be identified with reference to vendor-unique data, and the replacement processing is performed as necessary, so that the structural data is always assured. It can be retained so that it can be reproduced, and thus the reliability of the optical disk device can be improved.

(3) Other Embodiments In the above-described embodiments, the case where the structural data is replaced and the structural data is detected based on the vendor unique data has been described, but the present invention is not limited to this. Not limited to, the sector that records management data such as directory data and file allocation table data necessary for playing other sectors is replaced, and these sectors are detected based on vendor-unique data. You may do it.

[0042]

As described above, according to the present invention, the recording area of the disk-shaped recording medium is divided into sectors, and at least one of the sectors is allocated to the recording sector for management data.
The management data required for reproducing the remaining sectors is recorded in the management data recording sector, the identification data and the error detection / correction code are recorded, and the management data is recorded as the error correction processing result reference. By performing sector replacement processing, it is possible to detect the sector of the management data that has been subjected to replacement processing based on the identification data, thereby holding this type of management data so that it can always be reproduced, and improving reliability. It is possible to obtain an optical disk device capable of

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disk device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a sector format of the optical disk.

FIG. 3 is a flowchart for explaining the operation.

[Explanation of symbols]

1 ... Optical disk device, 2 ... Optical disk, 6 ... RF
Signal processing circuit, 8 ... Data modulation / decoding circuit, 9 ... System control circuit, 13 ... Buffer memory.

Claims (2)

[Claims] 1. A disk-shaped recording medium is irradiated with a light beam in response to a predetermined control command to record desired data on the disk-shaped recording medium, and the reflected light of the light beam is received. In an optical disc device for reproducing the data recorded on the disc-shaped recording medium, the recording area of the disc-shaped recording medium is divided into sectors,
At least one of the above-mentioned sectors is assigned to a recording sector of management data, and the management data necessary for reproducing the remaining sectors is recorded in the recording sector of the management data.
When recording the identification data of the recording sector of the management data, the management data and the error detection and correction code of the identification data, and reproducing the management data, the management data is used as the error correction processing result reference of the management data. An optical disk device characterized in that the recording sector of the disk is replaced. 2. The optical disk device according to claim 1, wherein the optical disk device searches the identification data and detects a recording sector of the management data when the optical disk device is activated.