JPH07312024A - Control method for data recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent data access time from becoming long and large by deciding the number of remaining alternate sectors of the alternate sector area of a group to which a specified recording sector is belonging and deciding whether a data recording commanded from a host device can be accepted or not according to the number of remaining alternate sectors. CONSTITUTION:A host device sets an alternation prohibition possible mode with respect to a magneto-optical disk device via a host I/F 6. The control part 2 of the magneto-optical device reads in the defection managing information of a magneto-optical disk 1 in an initialization procession to prepare a table of numbers of defective sectors for respective groups and preserves the table in the memory for control 5. When a data recording is commanded, the control part 2 calculates the number of remaining alternate sectors of the group to which a specified sector is belonging by referring to the content of the table and in the case the number of the remaining alternate sectors is zero, the control part 2 allows it to be completed as an error. Thus, since data are recorded in a form in which sector alternate processions are finished in the same group, a situation in which data access time is prolonged is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a data recording area set on a recording medium into a plurality of groups, and sets a predetermined number of alternative sector areas for each group. When detected, the control method of the data recording / reproducing apparatus having the sector replacement processing function of recording the data that could not be recorded in the defective sector in any of the alternative sectors of the alternative sector area set in the group to which the defective sector belongs. Regarding

[0002]

2. Description of the Related Art For example, in a magneto-optical disk device, a data recording area set on a recording medium is divided into a plurality of groups, and a predetermined number of alternative sector areas are set for each group. When a sector is detected, sector replacement processing is performed in which data that could not be recorded in the defective sector is recorded in one of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs.

By applying the sector replacement process in this way, data can be properly recorded even when a magneto-optical disk having a relatively large data error rate is used as a recording medium.

[0004]

However, the conventional apparatus for performing such sector substitution processing has the following inconveniences.

For example, when defective sectors are concentrated in a certain group, many alternative sectors in the alternative sector area set in the group are used. When the remaining number becomes 0 and a defective sector occurs in that group thereafter, the alternative sector of the defective sector is, for example, the alternative sector area of the next group physically contiguous with the group to which the defective sector belongs. Secured in.

Therefore, there are cases where alternative sectors that replace the same group of sectors are arranged over a plurality of groups. In such a case, it takes a long time to read the data of the alternative sectors, and the data access time becomes long. It causes the inconvenience.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control method of an information recording / reproducing apparatus capable of preventing the data access time from being lengthened.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a data recording area set on a recording medium is divided into a plurality of groups, and a predetermined number of sectors are set for each group. When a sector is detected, a data recording / reproducing apparatus having a sector replacement processing function of recording data that could not be recorded in the defective sector in any of the alternative sectors of the alternative sector area set in the group to which the defective sector belongs In the control method,
For each group, create a group-specific alternative sector number table that indicates the number of sectors used in the alternative sector area, and when data recording is instructed by the host device, the alternative sector area of the group to which the specified recording sector belongs The number of remaining alternative sectors is determined by referring to the above group-by-group alternative sector number table, and it is determined whether or not to accept the data recording instructed by the host device according to the number of remaining alternative sectors. is there.

Further, the data recording area set on the recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and if a defective sector is detected during data recording, the defective sector is detected. In the control method of the data recording / reproducing apparatus having the sector substitution processing function of recording the data that could not be recorded in the sector in any of the alternate sectors of the alternate sector area set in the group to which the defective sector belongs, during the data recording operation. When the number of remaining alternative sectors in any of the alternative sector areas becomes 0 due to the sector alternative processing that has occurred in the above, the subsequent data recording operation is not performed for the group to which the alternative sector area belongs. It is a thing.

Further, the data recording area set in the recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and when a defective sector is detected during data recording, the defective sector is detected. In the control method of the data recording / reproducing apparatus having the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, for each group , The alternative sector number table for each group showing the number of used sectors of the alternative sector area is formed, and when data recording is instructed from the upper device, the remaining alternative sectors of the alternative sector area of the group to which the specified recording sector belongs The number is determined by referring to the table for the number of alternative sectors by group, and the remaining While determining whether to accept the data recording instructed by the host device according to the number of alternative sectors, if the sector alternative process occurs during the data recording operation, the number of alternative sectors by group for the group in which the sector alternative process occurs The contents of the table are updated.

Further, the data recording area set on the recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and if a defective sector is detected during data recording, the defective sector is detected. In the control method of the data recording / reproducing apparatus having the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, for each group , The alternative sector number table for each group showing the number of used sectors of the alternative sector area is formed, and when data recording is instructed from the upper device, the remaining alternative sectors of the alternative sector area of the group to which the specified recording sector belongs The number is determined by referring to the table for the number of alternative sectors by group, and the remaining While determining whether to accept the data recording instructed by the host device according to the number of alternative sectors, if the sector alternative process occurs during the data recording operation, the number of alternative sectors by group for the group in which the sector alternative process occurs The contents of the table are updated, and when the number of remaining alternative sectors in the alternative sector area of the group becomes 0 due to the sector alternative processing, the subsequent data recording operation is not performed for the group. .

[0012]

Therefore, it is determined whether or not to accept the data recording request from the host device by referring to the group-by-group alternative sector number table and according to the number of remaining alternative sectors in the same group. It is possible to avoid a situation in which more defective sectors than the alternative sectors set in the group occur, and a situation in which the data access time becomes long can be avoided.

Further, in the group-by-group alternative sector number table, when the number of remaining alternative sectors in the same group becomes 0, data recording is prohibited thereafter for that group, so that a series of data is recorded. It is possible to prevent a situation in which the alternative sector extends over a plurality of groups and the data access time becomes long.

Further, since the group-by-group alternative sector number table is updated every time the alternative process occurs, the number of remaining alternative sectors at that time can be appropriately determined.

[0015]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a magneto-optical disk according to an embodiment of the present invention. In the following description, as the information format (recording format format) of the magneto-optical disk,
The one according to the so-called ISO standard is used.

A large number of concentric recording tracks are formed on the magneto-optical disk 1, and each recording track is divided into 25 sectors as shown in FIG. 2 (a). Further, as shown in FIG. 2B, each sector has a header portion HD in which a synchronization signal and addresses of the sector (track address and sector address) are recorded, and a recording portion DD in which user data can be recorded. Consists of.

Further, the recording section DD, as shown in FIG. 3C, has a data area DA in which 512 bytes of user data can be recorded and an error correction for correcting the data recorded in the data area DA. It consists of an error correction area EA in which the code ECC is arranged. Further, in the last part of the data area DA, vendor unique data VU capable of recording arbitrary data, and an error detection code CRC for detecting an error in the data area DA including the vendor unique data VU.
The area in which is arranged is set in addition to the 512-byte data recordable area. User data is not normally recorded in the vendor unique data VU.

FIG. 3A shows an example of a track format in the magneto-optical disk 1. This format is an ISO standard track format.

Track number "0" to track number "9"
Up to 999 "are set in the area in which data can be recorded by the drive, and of these, track numbers" 3 "to" 9996 "are set in the user data area. Here, in the user data area, an R / W area in which data can be written and a ROM area in which data cannot be written can be set.

For example, when distributing an application program, the user data area is divided into two areas, an R / W area and a ROM area, and the application program and fixed data to which the application program refers are recorded in the ROM area. A work area in which the user can write data is set in the R / W area. The magneto-optical disk in which the ROM area is partially set in this way is called a partial ROM format magneto-optical disk or a partial ROM disk.

When the magneto-optical disk 1 is used as a recording medium for user data, it is possible to set all the user data areas in the R / W area without allocating the ROM area. Generally, such a user data area setting method is used.

Further, the R / W area can be divided into a plurality of groups, and each group is set with a replacement sector area for replacing a defective sector.

Further, two defect management areas DMA are provided in the portion from the track number "0" to the track number "3".
1 and DMA2 are continuously arranged, and two defect management areas DMA3 and DMA4 are continuously arranged in the portion from the track number "9997" to the track number "9999".

The track number "-1" and the track number "10000" are set in the buffer track, and the track number "-2" to the track number "-16".
The part of is set to the inner peripheral side control area, and the part of track number "10001" to track number "10015" is set to the outer peripheral side control area.

Here, the four defect management areas DMA1, D
The same information is recorded in MA2, DMA3, and DMA4, so that even if the contents of one of the defect management areas cannot be read, the contents of the other defect management areas can be read. That is, a plurality of pieces of the same information are arranged in a distributed manner to form a state resistant to data errors.

Defect management area DMA (DMA1, DMA
2, DMA3, DMA4) format examples are shown in FIG.

In the defect management area DMA, a disk structure management table DDS for referring to the status of the magneto-optical disk 1 and management information of the defective sector, at the time of formatting, etc.
A primary defect management table PDL for registering a defective sector found at a stage before recording user data, and a sector found at the time of recording user data and the recorded data of the sector are replaced and recorded. Secondary defect management table SDL for registering the relationship with the existing alternative sector
Are arranged in this order. These disk structure management table DDS, primary defect management table PDL, and secondary defect management table S
Each DL occupies a data area for one sector.
The disk structure management table DDS, the primary defect management table PDL, and the secondary defect management table SDL are information elements defined by the ISO standard format.

An example of the contents of the disk structure management table DDS is shown in FIG.

This disk structure management table DDS is a DDS identifier for indicating that this sector stores the disk structure management table DDS, the magneto-optical disk 1 has a partial ROM area, or the entire disk. Disk initial state information for displaying whether it is formatted in the inspection state, R / W area group number information for storing the number of groups set in the R / W area, R / W R / W area sector number information indicating the number of data sectors per group in the area, R / W indicating the number of alternative sectors per group in the R / W area
Area alternative sector number information, ROM area group number information for storing the number of groups set in the ROM area,
ROM area sector number information indicating the number of data sectors per group in the ROM area, ROM area parity sector number information indicating the number of parity sectors per group in the ROM area, start sector (track number and (in track ) Sector number) indicating the PDL start position information, and SDL start position information indicating the start sector of the secondary defect management table SDL.

An example of the contents of the primary defect management table PDL is shown in FIG.

The primary defect management table PDL includes a PDL identifier for indicating that this sector stores the primary defect management table PDL, defective sector number information indicating the number of defective sectors generated in the initial state, and , A defective sector address area in which the sector address (track number and (in-track) sector number) of each defective sector is stored.

An example of the contents of the secondary defect management table SDL is shown in FIG.

This secondary defect management table SDL has an SDL identifier for indicating that this sector stores the secondary defect management table SDL, and the length of the contents of this secondary defect management table SDL in bytes. The data length information represents the number of entries related to the replacement process registered in the secondary defect management table SDL, and the entry area represents the relationship between the defective sector and the replacement sector related to each replacement process. Here, one element (entry) of the entry area is composed of a defective sector address representing the sector address of the defective sector and an alternative sector address representing the sector address of the alternative sector.

FIG. 5 shows a magneto-optical disk device according to an embodiment of the present invention.

In the figure, the control section 2 is for controlling the operation of each section of the magneto-optical disk device.
The drive mechanism circuit section 3 rotationally drives the magneto-optical disk 1 and records / reproduces / records data on / from the magneto-optical disk 1.
It consists of an erasing mechanism and its control / drive circuit.

The buffer memory 4 is for temporarily holding the data to be recorded on the magneto-optical disk 1 and the data read from the magneto-optical disk 1. The control memory 5 is for the control unit 2. For storing program data of control processing executed by the computer, various tables, etc. The host interface circuit 6 is connected to a host device (= upper device; not shown) such as a personal computer, It is for exchanging various data such as recording / reproducing data and control data. The host interface circuit 6 is, for example, a well-known SCSI (Small Comp).
A general-purpose interface such as the Uter System Interface (American standard ANSI X3.131-1986) can be applied.

In this embodiment, the control unit 2 forms a defective sector number table for each group for managing the defective sector number for each group set in the R / W area of the user data area of the magneto-optical disk 1. And stored in the control memory 5. An example of the defective sector number table for each group is shown in FIG.

This defective sector number table for each group is
Group numbers (= # 1, # 2, ..., Representing the number of groups set in the R / W area, the number of alternative sectors set per group, and the number of defective sectors detected for each group #N) The number of defective sectors.

With the above configuration, the host device to which this magneto-optical disk device is connected may be connected to a plurality of other external devices, and the host device performs an initialization process to be executed when the power is turned on. In, the inspection processing such as connection status and operation status for all connected external devices,
Inquiries about device names, function setting processing, etc. are executed as appropriate.

In this case, when the host device confirms that the magneto-optical disk device of FIG. 5 is connected from the device name obtained as a result of the inquiry, the host device sets the alternative prohibition mode. To do.

On the other hand, the magneto-optical disk device executes a predetermined initialization process when the power is turned on, and in the initialization process, the defect management information DMA of the magneto-optical disk 1 is read and the above-mentioned defective sectors by group are read. A number table is created and stored in the control memory 5.

Then, when an inquiry about the device name is issued from the host device, the device name stored in advance in the control memory 5 is returned to the host device.

When data recording is instructed from the host device, if the alternative prohibition enable mode is set at that time, the number of remaining alternative sectors of the group to which the designated sector belongs is determined by the defective sector number table for each group. When the number of remaining alternative sectors is 0,
The data recording operation at that time is ended in error.

When the number of remaining alternative sectors of the group to which the designated sector belongs is 1 or more, the data recording operation is performed on the designated sector. At that time, if sector replacement processing occurs, the number of remaining replacement sectors is updated.

When all the data transferred from the host device can be properly recorded, the host device is notified of the normal end of data recording, and the sector replacement process is executed during the data recording. When the number of remaining alternative sectors of the group to which the designated sector belongs becomes 0 and there is remaining recording data, the data recording is ended in error at that point.

When the data recording ends in error, the host device notifies the basic system to that effect and shifts to the data recording error state. When the data recording is normally completed, the basic system is notified of that fact.

In this way, in this embodiment, when the alternative prohibition enable mode is set by the host device, the magneto-optical disk device distributes the recording data of the magneto-optical disk 1 to the alternative sector areas of a plurality of groups. Since the alternative sector process that causes the situation of recording is not performed, the data to be recorded on the magneto-optical disk 1 is recorded in a manner in which the sector alternative process is completed within the same group, so that the data access time becomes long. Such a situation can be avoided.

FIG. 7 shows a part of the initialization process executed by the host device when the power is turned on in this case.

First, when the power is turned on, the host device inspects the state of the internal unit (main memory etc.) of the device (process 101), and when it finishes, starts the basic system (operating system) ( Processing 1
02).

At the time of starting the basic system, various inspections such as the connection state and the operating state (power on / off, etc.) of the plurality of connected external devices, inquiries of device names, etc. are performed. By this, the device connected to the host device is registered so that it can be used in the basic system.

When the processing at the time of starting the basic system is completed, one external device registered in the system is selected (process 103), and the selected external device has a specific device name (in this case, It is checked whether or not it matches the device name registered in the magneto-optical disk device of FIG. 5 (decision 104).

When the result of determination 104 is YES, the function of the external device is set to the preset content (process 105) and the alternative prohibition mode is set (process 106). If the result of determination 104 is NO, the function of the external device is set to the preset content (process 107).

In this way, when the function setting for one external device is completed, it is checked whether or not the setting process for all external devices is completed (decision 108), and judgment 108
When the result is NO, the process returns to the process 103 and the process for the next external device is executed. When the result of determination 108 is YES, the process proceeds to the next process.

FIG. 8 shows an example of processing executed when the host device records data in the magneto-optical disk device.

The host device transfers control information designating a data recording request and data of a predetermined length requested for recording at that time to the magneto-optical disk device (process 20).
1) Wait until the result of data recording is answered (Process 2)
02).

Then, it is checked whether the returned data recording result is a normal end (judgment 203), and the judgment 203
If the result is YES, it is checked whether or not the data to be recorded at that time has ended (decision 204), and the judgment 2
When the result of 04 is NO, the process returns to step 201 to record the remaining data. Further, when the result of the determination 204 is YES, the end of data recording is notified (step 205), and this operation is ended.

When the response data recording result is an error end and the result of the determination 203 is NO, the data recording end is notified (process 206) and a predetermined error end state is entered. Transition.

9A and 9B show an example of control processing executed by the control unit 2 of the magneto-optical disk device.

When the power is turned on, the control unit 2 executes a predetermined initialization process (process 201), shifts to an operable state, and reads the data of the defect management area DMA from the magneto-optical disk 1. Then, (process 302), the group-based alternative sector number table is created based on the read data of the defect management area DMA, and the group-based alternative sector number table is stored in the control memory 5 (process 303). .

In this way, when it becomes operable, the control unit 2 shifts to the state of waiting for a command from the host device (NO loop of decision 304). Then, the command is received from the host device, and the result of judgment 304 is Y.
At ES, the content of the command received at that time is analyzed, and the command is an inquiry about the device name, a function setting, a data recording request, a data reading request, or other information. Is determined (determination 305, 306, 307, 308).

When the content of the command is an inquiry about the device name and the result of the judgment 305 is YES, the contents of the device name information stored in the control memory 5 are used as data of a predetermined format and the host interface circuit 6 The host device is notified via the (step 309), and the decision 304
Return to.

Judgment 3 because the content of the command is the function setting
When the result of 06 is YES, a predetermined function setting process (process 3) for internally setting the function notified at that time is performed.
Execute 10) and return to decision 304.

The content of the command is a data recording request,
When the result of judgment 307 is YES, a predetermined data recording process (process 311) for recording the data transferred to the specified sector of the magneto-optical disk 1 is executed, and the process returns to judgment 304.

The content of the command is a data read request,
When the result of the judgment 308 is YES, data is read from the specified sector of the magneto-optical disk 1 and a predetermined data read process (process 312) of transferring the read data to the host device is executed, and the judgment 304 Return to.

When the content of the command is other than that and the result of the judgment 308 is NO, a predetermined process (process 313) corresponding to the command at that time is executed and the process returns to the judgment 304.

FIG. 10 shows an example of the function setting process (process 310).

The control unit 2 checks whether or not the received command includes the setting data for the alternative prohibition mode (decision 401). When the result of the judgment 401 is YES, the alternative prohibition flag FDS is set. (Process 40
2) When the result of the determination 401 is NO, the alternative prohibition flag FDS is cleared (process 403) and the internal function of the apparatus is set corresponding to the other setting data (process 404).

FIG. 11 and FIG. 12 show an example of the data recording process (process 311).

First, the control section 2 determines that the alternative prohibition flag F is available.
Check if DS is set (decision 50
1) If the result of the determination 501 is YES, one of the designated sectors is selected (process 502), the group to which the sector belongs is determined, and the item of the group-based alternative sector number table corresponding to the group is selected. The contents are taken out, it is checked whether the value matches the number of alternative sectors, and it is checked whether the group is included in the alternative prohibited area (process 503).

When the group is included in the substitution prohibited area and the result of determination 504 is YES, the control unit 2 notifies the host device of the sector designation error and the group in which the data recording error has occurred. The number is notified (process 505), and the data recording operation at this time ends in error.

Further, when the group is not included in the substitution prohibited area and the result of the judgment 504 is NO, the control section 2 instructs the sector selected at that time.
A 1-sector data recording process (process 506) for recording 1-sector data is executed.

Then, it is checked whether or not this one-sector data recording process has been completed normally (judgment 507), and judgment 507 is made.
If the result is YES, it is checked at that point whether or not the recording operation of all the data received from the host device has been completed (decision 508). If the result of decision 508 is NO, the process returns to step 502, The remaining data is recorded. When the result of determination 508 is YES, the host device is notified that the data recording operation has been normally completed (process 509), and this process ends.

When the result of determination 507 is NO, the sector selected at that time is a defective sector, and therefore a predetermined sector replacement process (process 510) for replacing one sector of data at that time with a replacement sector. ) Is executed, and the defect management area DMA is executed based on the sector replacement process at that time.
The secondary defect management table SDL is updated (process 511) and the group-by-group defective sector number table is updated (process 512), and the process proceeds to the determination 508 and the subsequent processes are executed.

If the alternative prohibition enable flag FDS is not set and the result of determination 501 is NO, the same data recording process as in the conventional case is executed. That is, the control unit 2 selects one of the designated sectors (process 513), and selects the selected sector at that time.
A one-sector data recording process (process 514) for recording data for one sector is executed.

Then, it is checked whether or not the one-sector data recording process has been normally completed (judgment 515), and the judgment 515 is made.
If the result is YES, it is checked at that point whether or not the recording operation of all the data received from the host device is completed (decision 516). If the result of decision 516 is NO, the process returns to step 513. The remaining data is recorded. When the result of determination 516 is YES, the host apparatus is notified that the data recording operation has been normally completed (process 517), and this process ends.

When the result of determination 515 is NO, the sector selected at that time is a defective sector, and therefore a predetermined sector replacement process (process 518) for replacing one sector of data at that time with a replacement sector. ) Is executed, and the defect management area DMA is executed based on the sector replacement process at that time.
The contents of the secondary defect management table SDL are updated (process 519) and the contents of the group-by-group defective sector number table are updated (process 520). Here, it is checked whether or not the sector replacement process has been normally executed (decision 521). When the result of the judgment 521 is YES, the process proceeds to decision 516 and the subsequent processes are executed. When the result of determination 521 is NO, the host device is notified that data recording has ended in error (step 522), and this operation ends in error.

By the way, in the above-described embodiment, the case where the present invention is applied to the magneto-optical disk device has been described, but the present invention is also applicable to other similar external storage devices (for example, a magnetic disk device). Can be applied.

[0079]

As described above, according to the present invention,
By referring to the group-by-group alternative sector number table, it is determined whether or not to accept the data recording request from the host device according to the number of remaining alternative sectors in the same group. It is possible to avoid such a situation that a larger number of defective sectors than the existing substitute sectors occur and avoid a situation where the data access time becomes long.

In the group-by-group alternative sector number table, when the number of remaining alternative sectors in the same group becomes 0, data recording is prohibited for that group thereafter, so that a series of data is recorded. There is also an effect that it is possible to prevent a situation in which the data access time becomes long because the alternative sectors are spread over a plurality of groups.

Further, since the group-by-group alternative sector number table is updated every time the alternative process occurs, the number of remaining alternative sectors at that time can be appropriately determined.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a magneto-optical disk according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a track format of a magneto-optical disk.

FIG. 3 is a schematic diagram showing an example of allocation of a storage area of a magneto-optical disk.

FIG. 4 is a schematic diagram showing an example of a defect management area.

FIG. 5 is a block diagram showing a schematic configuration of a magneto-optical disk device according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing an example of a group-based alternative sector number table.

FIG. 7 is a flowchart exemplifying a part of the processing when the power of the host device is turned on.

FIG. 8 is a flowchart showing an example of processing when a data recording request is made by the host device.

FIG. 9 is a flowchart showing a processing example of the magneto-optical disk device.

FIG. 10 is a flowchart showing an example of a function setting process.

FIG. 11 is a flowchart showing a part of an example of a data recording process.

FIG. 12 is a flowchart showing another part of an example of the data recording process.

[Explanation of symbols]

 2 control unit 5 control memory

Claims (4)

[Claims] 1. A data recording area set in a recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and a defective sector is detected when a defective sector is detected during data recording. In the control method of the data recording / reproducing apparatus equipped with the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, for each group , The alternative sector number table for each group showing the number of used sectors of the alternative sector area is formed, and when data recording is instructed from the upper device, the remaining alternative sectors of the alternative sector area of the group to which the specified recording sector belongs The number of sectors is determined by referring to the group-based alternative sector count table above, and the remaining The method of data recording and reproducing apparatus characterized by determining whether or not to accept the command data recording from a host device in accordance with the number of sectors. 2. A data recording area set on a recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and a defective sector is detected when a defective sector is detected during data recording. In the control method of the data recording / reproducing apparatus having the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, during the data recording operation. When the number of remaining alternative sectors in any of the alternative sector areas becomes 0 due to the sector alternative processing that has occurred in the above, the subsequent data recording operation is not performed for the group to which the alternative sector area belongs. Control method for data recording / reproducing apparatus. 3. A data recording area set on a recording medium is divided into a plurality of groups, a predetermined number of sectors are set for each group, and a defective sector is detected when a defective sector is detected during data recording. In the control method of the data recording / reproducing apparatus equipped with the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, for each group , The alternative sector number table for each group showing the number of used sectors of the alternative sector area is formed, and when data recording is instructed from the upper device, the remaining alternative sectors of the alternative sector area of the group to which the specified recording sector belongs The number of sectors is determined by referring to the group-based alternative sector count table above, and the remaining While determining whether to accept the data recording instructed by the host device according to the number of sectors, if the sector replacement process occurs during the data recording operation, the group where the sector replacement process occurs A method of controlling a data recording / reproducing apparatus, characterized by updating the contents of the above. 4. A data recording area set on a recording medium is divided into a plurality of groups, a predetermined number of alternative sector areas are set for each group, and a defective sector is detected when a defective sector is detected during data recording. In the control method of the data recording / reproducing apparatus equipped with the sector substitution processing function of recording the data that could not be recorded in any of the alternative sectors in the alternative sector area set in the group to which the defective sector belongs, for each group , The alternative sector number table for each group showing the number of used sectors of the alternative sector area is formed, and when data recording is instructed from the upper device, the remaining alternative sectors of the alternative sector area of the group to which the specified recording sector belongs Number is determined by referring to the table for the number of alternative sectors by group above, and the remaining While determining whether to accept the data recording instructed by the host device according to the number of sectors, if the sector replacement process occurs during the data recording operation, the group where the sector replacement process occurs When the number of remaining alternative sectors in the alternative sector area of the group becomes 0 by the sector alternative process, the subsequent data recording operation is not performed for the group. Method for controlling data recording / reproducing apparatus.