JPH10106170A - Optical disk information recording system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the certifying processing time by making user data recordable without performing read modification. SOLUTION: At the time of performing write operation, a specific pattern is written in each data ID of all sectors of an optical disk, and a dummy data is written in a user data part. An ECC corresponding to this dummy data is calculated and imparted. Then, each ECC block is read in, and an initial defective sector is detected, and then an LBA excluding the defective sector is recorded in a management area to constitute the resultant ECC block. Stored sector information on a disk of a file is recorded in the management area, and this can be recognized by a host computer. Consequently, upon receipt of a write instruction to a sector from the host computer, the ECC block containing this sector is read to become an ECC error, while, whether the data ID is the specific pattern written at the certifying time or not is discriminated to distinguish it from a read error, and a data is put in a specified sector, while dummy data are written and buried in unspecified sectors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical disk system, and more particularly, to generating an ECC in a plurality of sectors,
The present invention relates to an optical disc information recording system that can be treated as a CC block and rewrite data in ECC block units.

[0002]

2. Description of the Related Art In multimedia applications that handle a large amount of image information, as the demand becomes complicated and the amount of required information increases, a means capable of holding larger-sized information and quickly accessing information is required. It has become. A typical example of such information holding means is an optical disk.

[0003] Examples of such optical disks include compact disks (CDs) that have developed as recording media for music and the like, CDROMs that have developed as recording media for computer data, and recording media for movies (moving images). Laser disks (LDs) that have been developed are now widely used.

A digital video disk (hereinafter referred to as a DVD disk) has been developed as a new type of optical disk capable of supporting a large capacity and high-speed and flexible information accessibility. In terms of capacity, in an example of the DVD disc standard, the disc capacity of two 0.6 mm thick transparent substrates (made of polycarbonate) is approximately 10 GB on both sides. The capacity is about 5 GB per side, but MPEG (Moving Picture Expert Gr.)
oup) Compressing a moving image according to the standard allows a movie of about 135 minutes to be recorded on one side.

When data is read / written from or to such a high-density medium, an ECC (error correction code) is used to correct an error in the data. ECC is added to the data and processed as an ECC block.

[0006] As shown in FIG.
Each sector consists of 16 sectors in which K bytes of data are recorded. Each sector has sector I as address data.
D1 to ID16 are assigned, and ECC1 in the horizontal direction and ECC2 in the vertical direction are recorded as error correction codes for correcting data recorded in the ECC block.
The ECCs 1 and 2 are error correction codes added to the data as redundant words in order to prevent the data from being unable to be reproduced due to a defect in the optical disk.

Each sector has 172 bytes, 12 rows of data, and a horizontal ECC 1 of 10 bytes for each row, and a vertical ECC 2 for vertical data.

FIG. 2 shows the structure of a sector. Each sector includes a header 50 including a physical block address of the sector and a read / write data section (R / W) 51. The read / write data unit 51 includes a DATA I including a logical block address (LBA) received from the host.
D52, RSV 53, user data 54, ECC
55.

In a rewritable optical disk in which one set of ECC is provided in a plurality of sectors as described above, when rewriting the number of sectors smaller than the ECC block, the ECC block including the sector is temporarily stored in a buffer memory in the optical disk device. After rewriting the data in the read / rewrite sector on the buffer memory, it is necessary to generate a new ECC and write it back to the optical disk. This operation is called read modify write.

FIG. 3 is a diagram for explaining this read-modify-write, and shows the structure of an ECC block and each sector read / written from / on an optical disk. In an optical disc system in which an ECC is generated and added, even if it is basically necessary to read data of only one sector and perform error correction, the entire ECC block including the sector is read and error correction is performed by the ECC. There is a need. When a read command for sector n is received from the host computer with respect to the optical disk having the configuration shown in FIG. 3, after reading sectors n to n + 15 into the data buffer in the optical disk device, there is a data error in the sector n portion. , The error of sector n is corrected using ECC, and the data is transferred to the host computer.

When data is recorded in a sector smaller than the ECC block length, as described above, the ECC block including the sector is temporarily read into the buffer memory in the optical disk device, and the data in the rewritten sector is replaced on the buffer memory. Thereafter, a new ECC is generated and added, and the ECC block is written back to the optical disc. In FIG. 3, for example, when data is recorded in sector n, after reading sectors n to n + 15 into a data buffer in the optical disk device, the data in sector n is replaced with user data received from the host computer, and a new ECC is performed. And records sector n to sector n + 15.

Further, a certification process is performed in order to recognize a defective sector of the optical disk in advance. FIG. 4 is a diagram for explaining this certification processing. First,
As shown in FIG. 4A, dummy data and a corresponding ECC are written on the entire surface of the optical disk (first pass).
Next, the entire surface of the optical disk is read as shown in FIG.
An error check is performed by the CC to detect a defective sector (second pass). FIG. 4B shows that the second sector of the ECC block (m) and the ECC
The case where the third sector of the block (m + 1) is a defective sector is shown. When a defective sector is detected, the defective sector cannot be used for recording user data.
As shown in (c), a shift occurs from the ECC block including the defective sector to the succeeding ECC block.

In such a certification process, as shown in FIG. 4C, it is necessary to re-record dummy data in a sector except for a defective sector, newly generate an ECC, and complete an ECC block. That is, in the certification process, it is necessary to trace (3 Pass) the entire surface of the optical disc three times.

[0014]

When user data is recorded in a completely unrecorded ECC block of an optical disk, a read-modify-write operation causes an ECC to be recorded on the optical disk.
Are not added, so that correction is impossible in all sectors. Conventionally, it was necessary to perform the above-mentioned certification processing in order to solve this problem.

For example, if all the sectors of the ECC block n are known to be unrecorded in advance, it is not necessary to read the data of all the sectors of the ECC block n, and only the recording operation is required. If the reading operation is not performed before the recording, it is not possible to distinguish whether or not the data is unrecorded, so that it is necessary to read the data, and the processing time increases.

Further, after dummy data has been once recorded on the entire surface of the optical disk which has been shipped in an unrecorded state, the entire surface is read, a defective sector is detected, and a certification process for excluding unusable sectors from usable sectors is performed. If
If there is a defective sector in the ECC block where the dummy data is recorded first, the ECC block will not be completed as described above. Even when user data is recorded on the optical disc in this state, correction failure occurs as in the case of the unrecorded state. In order to avoid this problem, after determining the defective sector, it is necessary to record dummy data on the entire surface again except for the defective sector and complete all ECC blocks.

However, in the case of a large-capacity optical disk, it takes a very long time to trace the entire surface three times in the certifying process as described above. An object of the present invention is to solve the above-described problem by enabling user data to be recorded on an optical disk including an unrecorded ECC block or an optical disk that has not been subjected to the certifying process and that has not been subjected to the certifying process, without performing read modification. .

[0018]

An optical disk information recording system according to the present invention comprises: an optical disk apparatus for performing error correction using ECC to read / write data from / on an optical disk; and a host apparatus connected to the optical disk apparatus. Wherein the host device uses a first write command when the ECC block including the sector to be rewritten is an unused block, and uses the first write command when the ECC block is a block including a used sector. Means for instructing the optical disk device to write data by using a write command of 2. When the optical disk device receives a write command from the host,
When the write command is the first write command,
Means for recording user data in a host-specified sector in the ECC block and recording dummy data in another sector in the ECC block; and when the write command is the second write command, the host-specified sector The included ECC block is read from the optical disk, an error check is performed, and if no error occurs, the ECC
A feature is provided in which user data is recorded in a sector designated by the host in the block, and other sector data in the ECC block is recorded without being changed.

According to the above optical disc information recording system, the ECC used by the host device for the first time in file management is used.
The command is transmitted to the optical disc device by distinguishing the write command to the sector in the block and the write command to the ECC block which has already been used. Unused EC
When the optical disk device receives a command for recording user data in a sector in the C block, dummy data is added to the user data transferred from the host device without performing read-modify-write, thereby obtaining a data length of one ECC block. The recording operation is performed on the target ECC block.

Further, the optical disk device according to the present invention
An optical disk device that performs error correction using CC, performs data read / write with respect to the optical disk, and performs data communication with an external host device, performs a certification process to recognize a defective sector of the optical disk in advance, Means for recording a specific pattern in each ECC block on the optical disc, means for reading an ECC block including a specified sector on the optical disc when a write command is received from the host device, Error processing means for performing an error check on a block; determining means for determining whether the specific pattern is recorded in the ECC block when an error is detected by the error processing means; recording of the specific pattern by the determining means Is determined, the ECC block Of recording the write date to the specified sector, comprising means for recording dummy data in the unspecified sector.

Further, a second optical disk apparatus according to the present invention is an optical disk apparatus which performs error correction using ECC, reads / writes data from / to an optical disk, and performs data communication with an external host device. When a write command is received from the device, a means for reading an ECC block including a designated sector on the optical disk, an error processing means for performing an error check on the read ECC block, and an error detected by the error processing means If it is determined that the ECC block is a blank area, and if the determining means determines that the ECC block is a blank area, a write date is recorded in a designated sector in the ECC block, Equipped with means for recording dummy data in non-designated sectors That.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical disk information recording system according to the present invention will be described below with reference to the drawings. FIG. 5 shows an optical disk apparatus 25 to which data is read / written from / to an optical disk 1 such as a DVD using a laser beam and to which the present invention is applied. On the track of the optical disc 1,
For each ECC block as a data recording unit and its sector, its address data is recorded in advance.

In FIG. 5, the optical disk 1 is rotated by a spindle motor 3 at a constant linear velocity (CLV), for example. This motor is driven by a spindle motor driver 4. Reading / writing data from / on the optical disc 1 is performed by the DVD head 2.
The DVD head 2 is fixed to a movable portion of a linear motor 7, and the linear motor 7 is driven by a DVD LM (linear motor) driver 9. When the linear motor 7 is driven by the DVD linear motor (LM) driver 9, the DVD head 2
Is moved in the radial direction.

The DVD head 2 is provided with an objective lens (not shown). The objective lens is actuated by a DVD actuator (act.) Driver 8 in a focusing direction (optical axis direction of the lens) and a tracking direction (optical axis direction of the lens). (In the direction perpendicular to).

The DVD head 2 is provided with a recording / reproducing semiconductor laser oscillator (not shown), which is controlled by an LD controller 5 to generate a recording / reproducing laser beam. The laser beam generated by the semiconductor laser oscillator is irradiated onto the optical disk 1, and the reflected light from the optical disk 1 is photoelectrically converted by a photodetector provided in the DVD head 2, and
The voltage is guided to the preamplifier 6 and amplified.

The output signal of the DVD preamplifier 6 includes signals relating to focusing and tracking, and this output signal is guided to the DVD servo preprocessor 11. DVD servo preprocessor 11 is DVD servo 1
4, a focus error signal sample and hold required for performing focus and tracking servo,
Tracking servo error signal sample hold, RO
Generation of a DPD tracking error signal for reproducing the M part,
The generation of hold timing at the header portion of each servo circuit and the generation of a track count pulse at the time of seek are performed.

The DVD servo 14 performs focusing and tracking servo based on the output signal from the DVD servo preprocessor 11 and controls the DVD actuator driver 8. As a result, the light beam generated from the DVD head 2 is always just focused on the optical disc 1, and the center of the light beam coincides with the center of each track on the optical disc 1.

In a state where focusing and tracking are performed, the output signal of the DVD preamplifier 6 reflects a change in reflectance from pits (recording data) formed on tracks (or lands) of the optical disc 1. I have. This signal is supplied to the DVD-RF processor 10 and
Valued. Further, in the DVD-RF processing unit 10, the ECC including the sector ID of the sector currently being accessed is
The data of the block is demodulated.

The demodulated data demodulated by the DVD-RF processing unit 10 is stored in the DRAM 12 and is stored in the DVD-RAM
After error correction using ECC is performed by the / ROM processor 13, the data is output to the host device 30 as an external device via the interface circuit (ATAPI or SCSI) 16. Also, the DVD-RAM / ROM processor 13 sends the interface circuit 1 from the host device 30.
6 is temporarily stored in the DRAM 12, added with ECC, and output to the LD controller 5.

The LD controller 5 outputs a control signal corresponding to the input data to the DVD head 2. In response to this control signal, a laser oscillator provided in the DVD head generates a laser beam, and data is written to the optical disc 1.

A DVD-RAM / ROM processor 1
3 is an LBA (logical blo) of each data received from the host.
actual PBA (physical block) corresponding to ck address)
address) and D up to the track corresponding to this PBA
In order to move the VD head 2, a DVD head movement control signal is output to the DVD servo 14.

The DRAM 15 is a memory for temporarily storing data to the host device 30 or data from the host device 30. The data stored in this memory is processed by the host device 30 or the DVD-RAM / ROM processor 13. It is read according to the speed.

An eject switch (E-SW) 20 is a switch for taking out the optical disk 1 from the apparatus, and is a DV switch.
It is connected to a D-RAM / ROM processor 13.
When this switch 20 is pressed, the DVD-RAM / RO
The M processor 13 controls the loading motor (LM) 7 to cause a tray (not shown) in which the optical head 1 is stored to protrude from the apparatus.

The home position sensor (HPS) 21 is a sensor for positioning the DVD head 2 at a predetermined position (near the innermost circumference of the optical disc 1) at the time of startup. Based on the detection signal of the home position sensor 21, the DVD servo 14 controls the DVD linear motor driver 9 to move the DVD head 2 to the predetermined position.

The DIP switch (D-SW) 19 is used to determine an ID number on the interface of the optical disk device 25 and an operation mode of the optical disk device 25 itself.

The CPU 17 is a processor that comprehensively controls the optical disk device 25 based on a program stored in the ROM 18. The ROM 18 is constituted by, for example, a flash EEPROM and includes a data read / write processing program according to the present invention.

FIG. 6 shows a host device 30 embodying the present invention. The processor unit 31 comprehensively controls the host device 30 based on the program stored in the memory unit 32,
It instructs the optical disk drive 25 to which the present invention is applied to read / write data.

The memory section 32 is a ROM (read only memory)
32a and a random access memory (RAM) 32b. The ROM stores programs and the like for controlling the entire host device 30. The RAM stores programs, data and intermediate results of programs being executed, which are input from an auxiliary storage device or the like. The control operation of the optical disk information recording system according to the present invention can be stored as a program in the ROM 32a or the RAM 32b.

The input / output control unit 48 controls data transfer between the memory unit 32 and the input / output device 49 or the input / output interface control unit 46 based on an instruction from the processor unit 31. The hard disk controller 34 and the flexible disk controller 36 control reading and writing of data from and to the hard disk 35 and the flexible disk 37, respectively, and the display controller 38 transfers display data to the display 39. The interface control unit 46 controls an interface with the optical disk drive 25 to which the present invention is applied. These hard disk control units 34,
In the flexible disk control unit 36, the display control unit 38, and the interface control unit 46, high-speed data transfer is required.
A method of data transfer is employed.

The keyboard control unit 40 and the mouse control unit 42 respectively control a keyboard 41 and a mouse 43 functioning as input devices of a man-machine interface. The printer control unit 44 controls a printer 45 configured by a type system or a dot system. Each control unit constituting the input / output control unit 48 exchanges data with the processor unit 31 and the memory unit 32 via the bus 47.

FIGS. 7 to 10 are diagrams for explaining a certifying process and a data recording method according to the present invention, which are executed in the above-described system. FIG. 7 shows a case where the certification is completed in two passes and the write is executed in this state. As shown in FIG. 7A, first, DATA IDs 52 of all sectors on the optical disk 1 (see FIG. 2).
Is written in the user data section 54, and an ECC corresponding to the dummy data is calculated and given. Next, as shown in FIG. 7B, each ECC block is read and an error check is performed to detect an initial defective sector. Next, as shown in FIG. 7C, an ECC block is formed excluding the defective sector.
This is performed by recording the LBA excluding the defective sector in the management area. This management area is an area provided at a predetermined position on the optical disk 1, and records information on which file is stored in which sector on the optical disk. Therefore, the host computer can know in which sector of the optical disk the user data is recorded. As shown in FIG. 7D, when a write command for a certain sector is received from the host, an ECC block including the sector is read and an ECC error occurs. By judging whether the error has occurred, it can be distinguished from a normal read error. Therefore, FIG.
As shown in (d), data from the host is put in the designated sector, and the non-designated sector is filled with dummy data and written.

FIG. 8 shows a case where data write is executed without certification. As shown in FIG. 8A, when a write command for a certain sector is received from the host, an ECC block including the sector is read and an ECC error occurs.
Judgment is made based on the above management area, and a normal read error is determined. Next, as shown in FIG. 8B, data from the host is put in the designated sector, and the non-designated sector is filled with dummy data and written.

FIG. 9 shows that the certification is completed in two passes.
This shows a case where a write command without read modification is received. First, as shown in FIG. 9A, a specific pattern is written to DATA IDs 52 of all sectors on the optical disk 1, dummy data is written to the user data section 54, and an ECC corresponding to the dummy data is calculated and assigned. Is done. Next, as shown in FIG. 9B, each ECC block is read and an error check is performed to detect an initial defective sector. Next, as shown in FIG. 9C, an ECC block is formed excluding the defective sector. This is performed by recording the LBA excluding the defective sector in the management area.
In this case, the host recognizes the unrecorded ECC block by referring to the management area, and specifies the start LBA of the unrecorded ECC block and issues a write command to the CPU 17.
Send to Then, as shown in FIG. 9D, data from the host is put in the designated sector, and the non-designated sector is filled with dummy data and written.

FIG. 10 shows a case where a write command without certify and without read modify is received. In this case as well, the host recognizes the unrecorded ECC block by referring to the management area, specifies the head LBA of the unrecorded ECC block, and issues a write command to the CP.
Transmit to U17. Then, as shown in FIG. 10B, data from the host is put in the designated sector, and the non-designated sector is filled with dummy data and written.

Next, the operation of the certifying process and the data recording method according to the present invention will be described with reference to the flowcharts of FIGS. FIG. 11 shows an operation when the host device 30 sends a conventional command to the optical disk device 25 to record user data. First, the CPU 17 determines the write length of the write data received from the host device 30 (step S1), and if longer than the ECC block length (No), determines whether the write start block is the head of the ECC block (step S2). If it is not the head of the ECC block, first, to record a fractional sector,
The number of fractional sectors is calculated (step S3), and if it is the head of the ECC block, the flow moves to step S11.

At step S1, if the write length of the received write data is shorter than the ECC block length (Yes), the CPU 17 sends an EC containing the block designated to be written via the DVD-RAM / ROM processor 13.
The C block is read (step S4), and it is determined whether an error due to ECC has occurred (step S5). If there is no error, the write data is replaced with the read ECC block (step S6). If there is an error in step S5, the CPU 17 determines whether the content of the DATA ID portion is a specific pattern at the time of certification (step S5).
7). FIG. 7D shows this state. When a specified sector is read, an ECC error occurs.
It is distinguished from a normal read error by a specific pattern of the section.

If "No" in step S7, it is further determined in step S9 whether or not the area is a blank area. FIG.
(A) and 8 (b) show this state. When a designated sector is read, an ECC error occurs. However, the CPU 17 determines that the area is blank due to the management area on the optical disk 1 and determines that a normal read error has occurred. Make a determination. If it is not a blank area in step S9, the host device 3
An error occurrence is output to 0 (step S10).

In step S8, FIG.
As shown in (b), sectors other than the sector specified by the host device 30 in the ECC block are filled with dummy data, and the ECC block is written. The above operation is repeated until the write execution length reaches the designated write length, as shown in steps S11 to S13.

Next, a case in which the host device 30 determines whether the ECC block is a recorded ECC block and issues a command when the user data is recorded, with reference to FIGS. 12 and 13, will be described. First, the host device 30 refers to the management area of the optical disc 1 and determines that there is no need to perform read-modify when the ECC block including the sector to be written is not used. Issue a command to write

That is, as shown in FIG. 12, the host device 30 first calculates the LBA and data length of the sector to be written (step S20). Next, the host device 3 in the optical disc 1
Then, the management area managed by 0 is compared with the sector to be written (step S21).

In step S22, it is determined whether or not the sector to be written is included in the management area, that is, whether or not an already recorded sector exists in the ECC block including the sector to be written. If “No” in the step S22, the host device 3
0 indicates that there is no read modify, and issues a command different from the normal write command to the optical disk device 25.
If “Yes” in the step S22, the normal write command (with read modification) is
Issue to Thereafter, the host device 30 repeats the above operation until all the user data is written to the optical disk 1.

As in steps S23 and S24, a flag can be used as means for discriminating whether an ECC block including a sector for recording user data including an uncertified optical disk is used for the first time. That is, if the target ECC block includes a recorded sector, a “read-modify-write execution flag” is added to the write command (flag ON), and an unused ECC block containing no recorded sector is added. The recording command can be distinguished without adding the “read-modify-write execution flag” (flag OFF).

Next, the operation performed by the optical disk device 25 when the write command is issued from the host device 30 while discriminating whether or not the read modify is necessary as described above will be described with reference to the flowchart of FIG.

First, the CPU 17 determines the write length of the write data received from the host device 30 (step S3).
0), if it is longer than the ECC block length (No),
It is determined whether the write start block is the head of the ECC block (step S31). If it is not the head of the ECC block, first, the fraction sector number is calculated to record the fraction sector (step S32). If it is the head, the flow moves to step S39.

In step S33, the CPU 17 determines whether the write command received from the host device 30 is a command that requires read modify. When the read modify is not necessary, the CPU 17 executes FIG.
As shown in 0 (b), the user data is written in the sector specified by the host device 30, and the dummy data is written in the non-designated sector in the ECC block.

If "Yes" in step S33, the CP
U17 reads the ECC block including the designated block for writing (step S35) and performs an ECC error check (step S36). If an error has occurred in step 36, the CPU 17 notifies the host device 30 that an error has occurred.
Write data is written to the specified sector of the read ECC block, and the other sectors are written with the original contents. The above operations are repeated until the write execution length reaches the designated write length, as shown in steps S39 to S41.

[0057]

When recording data in an unused ECC block, there is no need to perform READ-MODIFY-WRITE, and only the recording operation is required. Therefore, the time required for the WRITE process can be reduced. Further, since a disk that has not been certified can be used as it is, the certification processing can be omitted. Further, even when the optical disk is certified, the certification can be completed when a defective sector is detected, so that it is not necessary to trace the entire surface three times as in the related art, and the tracing process can be shortened because only two traces are required.

[Brief description of the drawings]

FIG. 1 is a data configuration diagram of an ECC block.

FIG. 2 is a data configuration diagram of a sector in an ECC block.

FIG. 3 is a diagram for explaining a read modify write.

FIG. 4 is a diagram for explaining a certification process.

FIG. 5 shows an optical disk apparatus to which data is read / written from / to an optical disk 1 using a laser beam and to which the present invention is applied.

FIG. 6 shows a host device 30 embodying the present invention.

FIG. 7 is a diagram for explaining a certification process and a data recording method according to the present invention.
The case where the process ends with a pass and the write is executed in this state is shown.

FIG. 8 is a diagram for explaining a certify process and a data recording method according to the present invention, and shows a case where data write is performed without certify;

FIG. 9 is a diagram for explaining a certification process and a data recording method according to the present invention.
This shows a case where a write command without read modification has been received, ending with a pass.

FIG. 10 is a diagram for explaining a certify process and a data recording method according to the present invention, and shows a case where a write command without certify and without read modify is received.

FIG. 11 is a flowchart showing an operation when the host device 30 sends a conventional command to the optical disk device 25 to record user data.

FIG. 12 is a flowchart showing an operation in which the host device 30 determines whether a block is a recorded ECC block and discriminates and issues a command when recording user data.

FIG. 13 is a flowchart showing an operation performed by the optical disk device 25 when a write command is issued from the host device 30 while discriminating whether read modification is necessary.

Claims (7)

[Claims] 1. A system comprising: an optical disk device for performing error correction using ECC to read / write data from / on an optical disk; and a host device connected to the optical disk device. EC containing sector
When the C block is an unused block, a first write command is used, and when the ECC block is a block including a used sector, a second write command is used to instruct the optical disc device to write data. The optical disc device, when receiving a write command from the host, when the write command is the first write command, records user data in a host-specified sector in an ECC block, Means for recording dummy data in another sector in the ECC block; and when the write command is the second write command, reading an ECC block including a host-specified sector from the optical disc, performing error checking, If no error occurs, the user data is stored in the sector specified by the host in the ECC block. An optical disc information recording system, comprising means for recording data without changing other sector data in the ECC block. 2. The host device determines whether or not an ECC block including a sector to be rewritten is an unused block by referring to a management area managed by the host device in the optical disc. The system of claim 1, comprising: 3. The system according to claim 1, wherein said write command includes a flag, and said host device has means for distinguishing said first and second write commands by turning on / off said flag. . 4. The system according to claim 1, wherein the optical disk device comprises a unit for configuring each ECC block by a plurality of sectors and reading / writing data in units of the ECC block. 5. An optical disk device for performing error correction using ECC to read / write data from / to an optical disk and to perform data communication with an external host device. Means for performing a certification process and recording a specific pattern in each ECC block on the optical disc; and means for reading an ECC block including a designated sector on the optical disc when a write command is received from the host device. An error processing unit that performs an error check on the read ECC block; a determination unit that determines whether the specific pattern is recorded in the ECC block when an error is detected by the error processing unit; When the recording of the specific pattern is determined, Serial recording the write date to the specified sector in the ECC block, the optical disk apparatus characterized by comprising, means for recording dummy data in the unspecified sector. 6. An optical disk device for performing error correction using an ECC to read / write data from / to an optical disk and performing data communication with an external host device, and when a write command is received from the host device, Means for reading an ECC block including a designated sector on the optical disc; error processing means for performing an error check on the read ECC block; and when the error processing means detects an error, the ECC block is left blank. Determining means for determining whether the area is an area; and when the determining means determines that the ECC block is a blank area, a write date is recorded in a designated sector in the ECC block and dummy data is recorded in a non-designated sector. Optical disc device characterized by comprising: . 7. The optical disk device according to claim 5, wherein each ECC block is constituted by a plurality of sectors, and further comprising means for reading and writing data in units of the ECC block.