JP2005044477A - Information recording/reproducing device and information recording control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the quality of a data recording signal on a recording medium, and to increase the safety of data. <P>SOLUTION: Upon the reception of a writing command from a host device 1201, the information recording/reproducing device reads the the data 501 of a side in which write data 1202 is written from a medium 210, and checks the quality of a data recording signal based on the presence of retrying at the time of reading. Then, when the quality of the recording sinal is good and the data 501 of the written side coincides with the write data 1202, a normal end is reported to the host device 1201 without performing writing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording / reproducing apparatus that records information on a computer-readable recording medium and reproduces information recorded on the recording medium, and a method for controlling the recording of information on the recording medium.

  Information handled by computers includes both programs and data. To facilitate the organization and work of storing, reading, searching, and correcting such information, programs and data are organized as a unit of information. Each (which is called a file) is named and processed one by one. The operating system (OS) of the host computer performs data management on the storage area held by the storage device by using a unique control method for all the storage devices.

For example, in an optical disk apparatus, a circular optical disk is used as a recording medium, and a storage area is formed on the optical disk in a spiral shape in order from logical block address (LBA) 0 as shown in FIG. In a disk medium used in the FAT format, information on the format (type, sector size, number of sectors, etc.) of the medium, information indicating the storage location of data for access from the OS, and the like are arranged near LBA0. The OS specifies the LBA of the data using the information and accesses the recorded data. In this case, the data on the disk medium is managed in the following three-part configuration (see, for example, Patent Document 1).
(1) Search table part 1101 (File Allocation Table part, hereinafter referred to as FAT part)
(2) Directory part 1102 (Directory part, hereinafter referred to as DIR part)
(3) Data portion 1103
The FAT unit 1101 is an area for storing the address of the next sector of a file recorded across a plurality of sectors of the disk medium, and the DIR unit 1102 is an area for storing a file start address and a file name. The data portion 1103 is an area for storing data that is the substance of the file.

In the conventional optical disk device, as shown in FIG. 12, when a write command (Write command) is received from an external host device (for example, a personal computer) 1201, writing is performed according to the following procedure.
(1) The write data 1202 transferred from the host device 1201 is received.
(2) The write data 1202 is directly written to the designated LBA on the disk medium 1203.

  On the other hand, in the conventional magnetic disk device, at the time of data writing, it is determined whether or not the write operation is performed in the same logical sector as the write operation executed immediately before. A control method of updating a certain logical sector with write data is known (for example, see Patent Document 2).

  In addition, in the hard disk drive, a control method is also known in which the LBA of the write command waiting for execution is compared with the LBA of the read command, and if there is no duplication, the read command is executed before all the write commands are executed. (For example, refer to Patent Document 3).

  Further, in the magneto-optical disk device, when the number of retries exceeds a predetermined value when reproducing information, the reproduction data from the corresponding sector is stored in the memory, and the reproduction data in the memory is read out at the subsequent access. A control method is also known (see, for example, Patent Document 4).

JP-A-11-134255 JP-A-2-35664 JP 2001-216092 A JP-A-8-95717

However, the information recording control method in the conventional information recording / reproducing apparatus described above has the following problems.
When writing data to the disk medium, there is no method for knowing the quality of the instructed LBA data on the medium and the quality of the data recording signal, and therefore writing control according to the quality of the data recording signal cannot be performed. In particular, a bus-powered device in which the power supply voltage may be lowered has a higher risk of recording signal quality degradation when the power supply voltage is lower than other devices, and some measures are required.

  Further, every time data is written from the OS to the medium, writing to the FAT unit also occurs. Further, as a problem on the OS side, a certain OS may issue a write command of LBA0 immediately after the medium is inserted. When writing data to a disk medium having a write protect mechanism, a certain OS reads LBA0 data and writes it to LBA0 as it is in order to test whether or not writing is possible. As a result of such an operation, when an error response is returned to the write command, the OS knows that the medium is write-protected, and when a normal end response is returned, it indicates that the medium is not write-protected. know.

  As described above, if the data in the FAT section, which is written more frequently than other LBAs, is lost, there is a high risk that the file cannot be read from the medium. When attempting to read file data, the OS first reads information about the data part from the FAT part and the DIR part, and reads data from the data part based on the read information. That is, when data is to be read from the data part, a read operation for the FAT part and the DIR part is always required.

  For this reason, if the FAT portion is damaged, the data cannot be read because the position of the data on the disk medium is unknown even if the data portion is not damaged. In other words, preventing damage to the FAT section as much as possible leads to an increase in the safety of data on the disk medium.

  In addition, when data is written with an inappropriate power for some reason, the quality of the data recording signal may be worse than that at the time of reading, but the quality of the data recording signal such as the FAT section should be maintained. No measures have been taken.

  An object of the present invention is to provide an information recording / reproducing apparatus capable of maintaining the quality of a data recording signal on a computer-readable recording medium and improving the safety of data, and such an information recording control method. It is.

  FIG. 1 shows the principle of the information recording / reproducing apparatus of the present invention. 1 includes an interface unit 101, a buffer unit 102, a writing unit 103, a reading unit 104, and a control unit 105.

  In the first information recording / reproducing apparatus of the present invention, the interface unit 101 receives a write instruction and write data for the recording medium 106, and the buffer unit 102 stores the received write data. The writing unit 103 writes the write data stored in the buffer unit 102 to the recording medium 106, and the reading unit 104 reads the data from the recording medium 106. Before writing the write data to the recording medium 106, the control means 105 instructs the reading means 104 to read the data at the write destination address from the recording medium 106, and checks whether or not a retry has occurred. If no retry occurs, the read data and the write data are compared. If they do not match, the write means 103 is instructed to write the write data to the recording medium 106.

  Whether or not a retry occurs during reading depends on the quality of the recording signal of the data to be read on the recording medium 106. If no retry occurs, the quality of the recording signal is considered to be a certain level or higher. If the data recorded at the write destination address is the same as the write data, it is not necessary to update the data on the recording medium 106, but if both are not the same, the data needs to be updated.

  Therefore, the control unit 105 determines that the write operation is unnecessary when no retry occurs and the write destination data and the write data match, and the write unit data and the write data do not match. The writing operation is instructed to the means 103.

  In the second information recording / reproducing apparatus of the present invention, the interface unit 101 receives a write instruction and write data for the recording medium 106, and the buffer unit 102 stores the received write data. The writing unit 103 writes the write data stored in the buffer unit 102 to the recording medium 106, and the reading unit 104 reads the data from the recording medium 106. If the operation of reading the data of the write destination address from the recording medium 106 is performed before receiving the write instruction, the control means 105 is based on the result of the read operation before writing the write data to the recording medium 106. Check whether a retry has occurred. If no retry occurs, the read data and the write data are compared. If they do not match, the write means 103 is instructed to write the write data to the recording medium 106.

  In the first and second information recording / reproducing apparatuses, if the read data and the write data match, the normal end report is made in response to the write instruction without instructing the write means 103 for the write operation. The control means 105 may be configured.

  In the first and second information recording / reproducing apparatuses, when the write destination is a specific area set in advance on the recording medium 106, it is checked whether or not a retry has occurred and the writing means 103 is controlled. In addition, the control means 105 may be configured.

  In the first and second information recording / reproducing apparatuses, the writing unit 103 is controlled by checking whether or not a retry has occurred in response to a writing instruction received within a certain time after the start of the medium loading process. The control means 105 may be configured.

  In the first and second information recording / reproducing apparatuses, if the power supply voltage is lowered when a retry occurs, an error report is made in response to the write instruction without instructing the write means 103 to perform the write operation. In addition, the control means 105 may be configured.

  In the third information recording / reproducing apparatus of the present invention, the interface unit 101 receives a write instruction and write data for the recording medium 106, and the buffer unit 102 stores the received write data. The writing unit 103 writes the write data stored in the buffer unit 102 to the recording medium 106. The control means 105 checks the quality of the recording signal of the data recorded at the write destination address of the recording medium 106 before writing the write data to the recording medium 106. Then, if the quality of the write destination data is good, the write destination data and the write data are compared. If they do not match, the write means 103 is instructed to write the write data to the recording medium 106.

  The interface means 101, buffer means 102, write means 103, and read means 104 in FIG. 1 correspond to the host interface 201, data buffer 202, write circuit 205, and read circuit 206 in FIG. The control means 105 corresponds to an MPU (Micro Processing Unit) 203 and a memory 204 in FIG.

  According to the present invention, it is possible to confirm the state of the logical block of the write destination (data recording signal quality) by reading before writing, the state of the logical block is good, and data writing is not performed. If it is not necessary, writing is not performed, so that the quality of the data recording signal of the FAT section or the like can be maintained.

Similarly, writing to LBA 0 can be avoided as much as possible with respect to problems on the OS side, so that the chance of damage to the FAT portion due to writing can be reduced.
Furthermore, even when a bus-powered device or the like is used, by monitoring the power supply voltage, it is possible to prevent the quality of the data recording signal from being deteriorated due to the execution of writing when the voltage drops.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 2 is a configuration diagram of the optical disk device (magneto-optical disk device) of the present embodiment. 2 includes a host interface 201, a data buffer 202, an MPU 203, a memory 204, a writing circuit 205, a reading circuit 206, a fixed optical unit 207, a head 208, and an optical lens system 209. A magneto-optical disk 210 (disk medium) is detachably mounted on the optical disk apparatus.

  The host interface 201 communicates with an external host device and receives various commands from the host device. The data buffer 202 is, for example, a RAM (Random Access Memory), and temporarily stores write data to the magneto-optical disk 210 and read data from the magneto-optical disk 210.

  The MPU 203 executes a program to control the operation of the optical disc apparatus. The memory 204 includes a ROM (Read Only Memory) that stores a program executed by the MPU 203 and a RAM that stores data such as intermediate results of arithmetic processing. The writing circuit 205 performs writing to the magneto-optical disk 210 via the fixed optical unit 207, the head 208, and the optical lens system 209, and the reading circuit 206 includes the fixed optical unit 207, the head 208, and the optical lens system 209. To read from the magneto-optical disk 210.

  FIG. 3 is a flowchart of the basic operation of the optical disc apparatus of FIG. When the power is turned on, the MPU 203 first checks whether or not the medium is turned on (step 301), and if the medium is turned on, next checks whether or not the medium loading process is completed. (Step 302). The medium loading process is intended to be a process in which a medium is inserted and a state in which reading and writing can be performed. If the medium loading process is not completed, the medium loading process is executed (step 303).

  Next, it is checked whether or not a command is received from the host device (step 304). If the command is received, command processing is executed (step 305). Next, the power supply voltage is measured and compared with a predetermined threshold value to check whether or not the power supply voltage has decreased (step 306). If the power supply voltage is lower than the predetermined threshold, a flag indicating a voltage drop is set (step 307). This flag is held in the memory 204, for example.

Thereafter, the MPU 203 repeats the processing from step 301 onward, and executes each processing when the medium loading processing or command processing occurs.
FIG. 4 is a flowchart of command processing performed in step 305 of FIG. The MPU 203 first determines the type of command received (step 401). If it is a write command, a write process is executed (step 402). If it is a read command, a read process is executed (step 403). If it is another command, the process of each corresponding command is executed. Implement (step 404). Other commands include commands such as format, medium capacity check, and status sense.

In the write process when a Write command is received from the host device, the following control is performed.
-Check the quality of the recorded signal when writing.
-When it is not necessary to perform writing to an LBA having a good recording signal quality, a normal completion report is sent to the host device without performing writing.
-Regarding voltage drop, if a retry occurs when reading data, there is a possibility that writing may fail due to factors such as insufficient power during writing. Therefore, an error is reported to the host device without writing.

FIG. 5 shows such write control. When a Write command is received from the host device 1201, writing is performed according to the following procedure.
(1) The write data 1202 transferred from the host device 1201 is received.
(2) Before performing physical writing to the magneto-optical disk 210, the data 501 of the write destination LBA is read from the magneto-optical disk 210.
(3) It is checked whether or not an internal retry has occurred at the time of reading the data 501, and the write data 1202 and the read data 501 are compared to check whether they match. Whether to perform physical writing (execution / non-execution) is determined based on these check results. The internal retry means a retry performed by control closed in the magneto-optical disk device, and does not include a retry explicitly instructed from the host device. The retry in the following description means an internal retry.

  FIG. 6 is a flowchart of the Write command process including the write control of FIG. First, the MPU 203 instructs to read data from the write destination LBA, and the reading circuit 206 reads from the medium (step 601). Then, the MPU 203 checks whether or not a retry has occurred (step 602).

  The presence or absence of a retry at the time of reading can be checked by a known method. When the signal quality deviates from the overall optimum value, for example, a retry at the time of reading is performed by a method of searching for the optimum point by raising and lowering the power of the laser diode provided in the fixed optical unit 207.

  If no retry occurs, a comparison is performed (step 603), and it is checked whether the read data and the write data match (step 604). In the compare process, all data of the corresponding LBA are compared by, for example, binary compare.

  If the read data and the write data do not match, it is necessary to update the data on the medium. Therefore, the writing to the medium is instructed, and the writing circuit 205 performs the writing to the medium (step 605). If the read data and the write data match, it is not necessary to update the data, so the normal completion report is sent to the host without performing the write.

  If retry occurs in step 602, the quality of the recording signal on the medium is low, and there is a high possibility that the quality is improved by writing. Therefore, the operation of step 605 is performed without performing the comparison.

  Next, command processing when cache control is implemented in the optical disc apparatus will be described. In this case, a data buffer called a cache memory having a high data transfer rate is built in the optical disk device, and commands and data from the host device that are likely to be used later are temporarily stored in the cache memory. Save it. Control in which instructions and data once stored in the cache memory are used later is called cache control.

  In the optical disk apparatus of FIG. 2, a part of the data buffer 202 is used as a cache memory. In particular, when data read at the time of reading is held in a cache memory, the cache memory is called a read cache.

  When the Read cache is implemented, data is held in the Read cache in the Read command processing. However, if a retry occurs when data is read from the medium, after transferring the data to the host device, The cache data of the corresponding LBA is invalidated. With this control, it is possible to know whether or not a retry has occurred for the data by checking whether or not the data is retained (validated) in the Read cache when determining execution / non-execution of writing. Can do. Since data held in the Read cache has not been retried, there is no need to actually read it from the medium.

  FIG. 7 is a flowchart of Read command processing when such a Read cache is implemented. The MPU 203 first checks whether or not data to be read is held in the Read cache (step 701). If no data is held, the MPU 203 instructs to read the data (step 702). Then, it is checked whether or not a retry has occurred (step 703).

  If a retry occurs, the cache data of the corresponding LBA is cleared (invalidated) (step 704), and the process ends. If no retry occurs, the process ends without clearing the cache data. If data is held in the Read cache in step 701, it is not necessary to read from the medium, and the process is terminated as it is.

  Thus, since the cache data is cleared when a retry occurs, it can be determined that no retry has occurred if the data of the write destination LBA is held in the Read cache.

When the Read cache is available, the above-described write command processing procedure is changed as follows.
-For the write destination LBA, it is checked whether or not the data is held in the Read cache in the previous Read command processing for the same LBA.
-If there is no data in the cache (retry occurs) → Write.
-When held in the cache (no retry)-Compare the cache data and write data.

• If the data matches → Do not write (report normal termination to the host).
• If the data does not match → Perform writing.

Next, an example of a preferred Write command process when the Read cache is available will be described with reference to FIGS.
FIG. 8 is a flowchart of a write command process for determining whether to execute or not execute a write when a write command having the FAT part as a write destination is received. The MPU 203 first checks whether or not the write destination is the FAT unit (step 801). For example, LBA0 to LBA99 are set in advance as a specific LBA range corresponding to the FAT part, and it is determined whether or not the write destination is the FAT part by checking whether or not the write destination LBA is within this range. Is checked.

  If the write destination is the FAT section, it is next checked whether or not the data of the write destination LBA is held in the Read cache (step 802). If the data is not held in the Read cache, the data is instructed to be read (step 803), and it is checked whether a retry has occurred (step 804).

  If no retry occurs, a comparison is performed (step 805), and it is checked whether the read data and the write data match (step 806). If the read data and the write data do not match, an instruction to write to the medium is given (step 807), and if the read data and the write data match, the process ends. If a retry occurs in step 804, the operation in step 807 is performed.

If the write destination is not the FAT part in step 801, the operation of step 807 is performed as it is without checking whether the retry has occurred.
According to such a Write command process, unnecessary writing to the FAT unit can be avoided, and the read operation in Step 803 for a write destination other than the FAT unit can be omitted. As a result, the waiting time for the rotation of the disk medium accompanying the read operation is reduced, and on average the write command processing is faster than the processing of FIG.

  In step 801, if the FAT part and the DIR part are set as a specific LBA range, the execution / non-execution of the writing can be determined when a write command having the FAT part or the DIR part as a write destination is received. . If the Read cache cannot be used, the same Write command processing can be performed by omitting the operations of Steps 802 and 808.

  Also, instead of checking the write destination LBA, the timer value (time) is recorded at the start of the medium loading process, and execution / non-execution of writing is performed when a Write command is received within a certain time from that time. It is also possible to make a judgment. In this case, the timer value is recorded in a predetermined area of the data buffer 202 and cleared when the medium is ejected.

  FIG. 9 is a flowchart of such a Write command process. First, the MPU 203 compares the recorded timer value with the current timer value, and checks whether or not a predetermined time has elapsed from the start time of the medium loading process (step 901).

  If the predetermined time has not elapsed, the same operation as in steps 802 to 808 in FIG. 8 is performed (steps 902 to 908), and if the predetermined time has elapsed, the operation of step 907 is performed as it is.

  According to such Write command processing, unnecessary writing to LBA 0 can be avoided even when a host device that issues an LBA 0 write command immediately after the medium is inserted is connected. Further, after a certain time has elapsed, the read operation in step 903 can be omitted as in the process of FIG. When the Read cache cannot be used, the same Write command processing can be performed by omitting the operations of Steps 902 and 908.

  FIG. 10 is a flowchart of a write command process for determining execution / non-execution of writing when a write command is received when the power supply voltage decreases. The operations in steps 1001 to 1007 in FIG. 10 are the same as the operations in steps 802 to 808 in FIG.

  When a retry occurs in step 1003, the MPU 203 refers to the flag of the memory 204 and checks whether the power supply voltage has decreased (step 1008). If the flag is set, the voltage is lowered. Therefore, if the writing is performed as it is, there is a high possibility that the quality of the recording signal is lowered. Therefore, if the voltage is lowered, an error is reported to the host device without performing writing. If the voltage has not dropped, the operation of step 1006 is performed as it is.

  For example, assuming that the specified value of the power supply voltage (input voltage) of the optical disc apparatus is 5V and the threshold value is 4.5V, a flag is set when the power supply voltage detected in step 306 in FIG. Therefore, if the power supply voltage is lower than 4.5V when the write command processing is executed and a retry occurs during the read operation, the host device receives an error response from the optical disk device.

  According to such a Write command process, writing is not performed when the power supply voltage of the optical disc apparatus is lowered, so that the quality of the data recording signal is prevented from being lowered. When the Read cache cannot be used, the same Write command processing can be performed by omitting the operations of Steps 1001 and 1007.

  In the embodiments described above, the information recording control method in the optical disk device has been described. However, the present invention is not limited to this, and the present invention is not limited to this, and also applies to magnetic disk devices such as hard disk devices and flexible disk devices, and other information recording / reproducing devices. Applicable. In particular, when applied to an information recording / reproducing apparatus for a portable recording medium, an effect can be expected in maintaining the quality of a data recording signal.

(Appendix 1) Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Reading means for reading data from the recording medium;
Before writing the write data to the recording medium, the read unit is instructed to read out data at a write destination address from the recording medium to check whether a retry has occurred. Control means for comparing the read data with the write data, and instructing the write means to write the write data to the recording medium if the read data does not match the write data; An information recording / reproducing apparatus comprising:

(Appendix 2) Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Reading means for reading data from the recording medium;
If an operation for reading data at a write destination address from the recording medium is performed before receiving the write instruction, a retry occurs based on the result of the read operation before writing the write data to the recording medium. If no retry has occurred, the read data is compared with the write data. If the read data does not match the write data, the write data is recorded in the recording data. An information recording / reproducing apparatus for instructing an operation of writing to a medium to the writing means.

  (Supplementary Note 3) If the read data and the write data match, the control means performs a normal end report to the write instruction without instructing the write means to perform the write operation. The information recording / reproducing apparatus according to Supplementary Note 1 or 2, characterized by the above.

  (Supplementary Note 4) When the writing destination is a specific area set in advance on the recording medium, the control unit checks whether or not a retry has occurred and controls the writing unit. The information recording / reproducing apparatus according to appendix 1 or 2.

  (Supplementary note 5) The control unit controls the writing unit by checking whether or not a retry has occurred in response to a write instruction received within a predetermined time after the start of the medium loading process. 3. The information recording / reproducing apparatus according to 1 or 2.

  (Supplementary Note 6) If the power supply voltage is lowered when a retry occurs, the control unit reports an error to the write instruction without instructing the write unit to perform the write operation. The information recording / reproducing apparatus according to appendix 1 or 2.

(Appendix 7) Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Before writing the write data to the recording medium, check the quality of the recording signal of the data recorded at the write destination address of the recording medium, and if the quality of the write destination data is good, Control means for comparing the write data and, if the write data does not match the write data, a control means for instructing the write means to write the write data to the recording medium Recording / playback device.

(Appendix 8) Receives a write instruction and write data for a recording medium,
Store the received write data in the buffer means,
Before writing the write data stored in the buffer means to the recording medium, check whether or not a retry has occurred by performing an operation of reading the data at the address of the write destination from the recording medium,
If no retry occurs, the read data is compared with the write data,
If the read data and the write data do not match, write the write data to the recording medium,
An information recording control method, wherein if the read data matches the write data, a normal end report is made in response to the write instruction without writing the write data to the recording medium.

(Supplementary Note 9) Receives a write instruction and write data for a recording medium,
Store the received write data in the buffer means,
If the operation of reading the data at the write destination address from the recording medium is performed before receiving the write instruction, the result of the read operation before writing the write data stored in the buffer means to the recording medium To check if a retry occurred based on
If no retry has occurred, the read data is compared with the write data,
If the read data and the write data do not match, write the write data to the recording medium,
An information recording control method, wherein if the read data matches the write data, a normal end report is made in response to the write instruction without writing the write data to the recording medium.

(Supplementary Note 10) Receives a write instruction and write data for a recording medium,
Store the received write data in the buffer means,
Before writing the write data stored in the buffer means to the recording medium, check the quality of the recording signal of the data recorded at the write destination address of the recording medium,
If the quality of the write destination data is good, the write destination data is compared with the write data,
If the write data does not match the write data, write the write data to the recording medium,
If the write destination data and the write data match, a normal end report is made in response to the write instruction without writing the write data to the recording medium.

1 is a principle diagram of an information recording / reproducing apparatus of the present invention. It is a block diagram of an optical disk device. 3 is a basic operation flowchart of the optical disc apparatus. It is a flowchart of command processing. It is a figure which shows the write-in control of this invention. It is a flowchart of the 1st Write command processing. It is a flowchart of a Read command process. It is a flowchart of the 2nd Write command processing. It is a flowchart of a 3rd Write command process. It is a flowchart of the 4th Write command processing. It is a block diagram of the storage area of an optical disk. It is a figure which shows the conventional write control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Interface means 102 Buffer means 103 Writing means 104 Reading means 105 Control means 106 Recording medium 201 Host interface 202 Data buffer 203 MPU
204 Memory 205 Write Circuit 206 Read Circuit 207 Fixed Optical Unit 208 Head 209 Optical Lens System 210 Magneto-Optical Disk 501 Data on Medium 1101 FAT Unit 1102 DIR Unit 1103 Data Unit 1201 Host Device 1202 Write Data 1203 Disk Medium

Claims (5)

Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Reading means for reading data from the recording medium;
Before writing the write data to the recording medium, the read unit is instructed to read out data at a write destination address from the recording medium to check whether a retry has occurred. Control means for comparing the read data with the write data, and instructing the write means to write the write data to the recording medium if the read data does not match the write data; An information recording / reproducing apparatus comprising: Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Reading means for reading data from the recording medium;
If an operation for reading data at a write destination address from the recording medium is performed before receiving the write instruction, a retry occurs based on the result of the read operation before writing the write data to the recording medium. If no retry has occurred, the read data is compared with the write data. If the read data does not match the write data, the write data is recorded in the recording data. An information recording / reproducing apparatus for instructing an operation of writing to a medium to the writing means.   The control means, if the read data and the write data match, does not instruct the write operation to the write means, and makes a normal end report in response to the write instruction. Item 3. The information recording / reproducing apparatus according to Item 1 or 2. Interface means for receiving a write instruction and write data for a recording medium;
Buffer means for storing the received write data;
Writing means for writing the write data stored in the buffer means to the recording medium;
Before writing the write data to the recording medium, check the quality of the recording signal of the data recorded at the write destination address of the recording medium, and if the quality of the write destination data is good, Control means for comparing the write data and, if the write data does not match the write data, a control means for instructing the write means to write the write data to the recording medium Recording / playback device. Receives write instructions and write data for the recording medium,
Store the received write data in the buffer means,
Before writing the write data stored in the buffer means to the recording medium, check the quality of the recording signal of the data recorded at the write destination address of the recording medium,
If the quality of the write destination data is good, the write destination data is compared with the write data,
If the write data does not match the write data, write the write data to the recording medium,
If the write destination data and the write data match, a normal end report is made in response to the write instruction without writing the write data to the recording medium.

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