JP3343403B2 - Alternate sector management method for information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an alternate sector management method for an information recording / reproducing apparatus using an information storage medium such as a magneto-optical disk. Check beforehand that the defective area is enlarged and recording and reproduction of valuable information (data) becomes impossible, and manage so that an unused area (non-recording area) adjacent to the defective area can always be secured. The present invention relates to a method for managing an alternate sector of an information recording / reproducing apparatus with improved data reliability.

[0002]

2. Description of the Related Art In an information storage medium such as a magneto-optical disk or an optical disk, it is unavoidable that a defect occurs on the storage medium at the time of manufacture or subsequent use. Can not be used for.
Therefore, conventionally, a storage area on an information storage medium is divided into areas of an appropriate length, and information recording / reproduction (verification) is performed in area units (sectors), and an area having a defect is not used. Instead, a process of recording / reproducing information using an area without any other defect (alternate area), that is, a so-called alternation process is used.

However, in this type of information storage medium, if an area (sector) having a defect already exists,
There is a problem that the defective area is likely to spread around due to long-term use or aging. As one conventional method for solving such inconvenience, a normal sector on one or more tracks adjacent to a defective sector on an information storage medium such as a magneto-optical disk is set as a non-recording alternate sector in advance. Alternate sector management methods have been proposed (eg,
JP-A-2-156478).

According to this replacement sector management method, a sector not used for recording and reproducing information (hereinafter, referred to as a replacement sector) is previously secured near a defective sector (defective sector). Even if the number is slightly increased, the inconvenience that the recording and reproduction of the information of the normal sector becomes impossible immediately is avoided. Here, a procedure for testing each sector in the conventional information recording / reproducing apparatus will be described.

When performing a test data recording operation,
Data is recorded in the target sector and reproduced to check whether the recorded data is correct (verify). At this time, if the data is recorded correctly (unless the condition for using the replacement area), it is determined that the sector is a normal sector, and
The test operation ends.

When the quality of the recorded data is poor and the replacement process is performed after being judged to be a defective sector (defective sector), the address of the replacement source (sector where the poor quality data is recorded) and the replacement destination The information such as the address of the (alternate area) is registered. Further, for the sector adjacent to the replacement source sector, the sector is already determined to be a defective sector, and it is checked whether information such as the replacement source address and the replacement destination address has been registered.

If the information such as the address of the replacement destination is not registered in the sector adjacent to the replacement source sector, a similar test is performed on the adjacent sector.
As a result of the test, when a sector adjacent to the replacement source sector is determined to be a normal sector, the normal sector is newly registered as a replacement sector (unused sector) and its replacement information is registered.

On the other hand, when the adjacent sector is determined to be a defective sector as a result of the test, information such as the address of the sector and the address of the replacement destination is registered. Thereafter, a similar test is performed on another sector adjacent to the replacement source sector, and the test is repeated until at least one or several normal sectors adjacent to the defective sector exist. , Its replacement address,
Register information such as a replacement address.

[0009] The above procedure is performed around at least one or several alternate sectors (normal sectors,
This is the processing of the conventional alternate sector management method in which unused sectors are arranged adjacent to each other to improve data reliability. According to this management method, when a defective portion expands to a replacement sector during normal use, another normal sector adjacent to the previously set replacement sector is added.
A process for newly setting a replacement sector (hereinafter referred to as a replacement sector process as appropriate) is performed.

In this process, information such as a replacement source address and a replacement destination address of an adjacent normal sector which is newly set as a replacement sector (still another normal sector) is registered. In this case, if an adjacent normal sector that is newly used as a replacement sector is used and data has already been recorded, the data is re-recorded in a predetermined area (replacement area) ( This replacement process is the same as in the related art).

As described above, in the conventional alternate sector management method, one or more normal sectors adjacent to the defective sector are allocated as non-recording areas (alternate sectors) in advance, and the defective sectors are allocated. As in the case, data is recorded in another replacement area (replacement processing is performed).
As described above, by setting the normal sector adjacent to the defective sector as a non-recording replacement sector in advance, even if the defective area (defective sector) is widened, data can be recorded and reproduced within the range of the replacement sector. Treat as possible.

However, there is no guarantee that the extension of the defective area (defective sector) will not extend over one track or several tracks. Therefore, if the number of tracks to be transferred to the replacement sector (the number of adjacent normal sectors allocated for non-recording sectors) is increased, in an extreme case, unless one disc is discarded, the reliability of data is reduced. There is a disadvantage that it cannot be guaranteed completely.

Here, the sector format of the optical disk will be described. For example, an ISO standard sector format of a magneto-optical disk is as shown in FIG.

FIG. 7 is a diagram showing a sector format in which the user byte is 1,024. The numbers in the figure indicate the number of bytes.

In FIG. 7, SM is a sector mark, V
FO1 to VFO3 are continuous data patterns for PLL lock, AM is an address mark, ID is an address (2 bytes as a track number, 1 byte as a sector number), CRC is an error detection code (2 bytes) of an ID part, ODF (Offset detection flag)
Is a mark for offset detection in tracking error detection using the push-pull method, gap is a gap having no data for a 3-byte length, flag is a flag (5 bytes) indicating that writing has been performed, and ALPC (automatic
(Laser power control) is a test section for controlling the power level of the laser, Sync is a synchronization signal (3 bytes) of the data section, and Data to resync (Da
(ta Field: 1,259 bytes) is an area for writing user data, and includes 1,024 bytes of user data and 235 bytes of DMP, ECC, CRC, and resy.
nc (a special code for synchronization in the Data area), and Buffer is an area (20 bytes) for a disk rotation fluctuation margin.

In the conventional alternation processing method, for example, in a magneto-optical disk having a sector format as shown in FIG. 7, an ECC (Error Correction Code) is used.
Is used to correct errors, but for sectors where there are too many errors to be corrected, data is recorded in a preset replacement area. Next, the configuration and operation of a conventional information recording / reproducing apparatus will be described.

FIG. 8 is a functional block diagram showing an example of a main part configuration of a conventional information recording / reproducing apparatus.
In the figure, 1 is an upper device, 2 is an optical disk device, 3 is a control unit thereof, 31 is a CPU, 32 is a control memory, 4
Denotes a drive unit, 41 denotes a write control unit, 42 denotes a read control unit, and 5 denotes a storage medium.

In FIG. 8, the information recording / reproducing device is
The case of the optical disk device 2 is shown. As shown in FIG. 8, the optical disk device 2 includes a drive unit 4 having an interface with the storage medium 5 and a control unit 3 having an interface with the host device 1 and having a control memory 32. It is configured.

The write controller 4 of the drive unit 4
1 and the read control unit 42 performs writing or reading on the storage medium 5. In this case, there is a defect in a certain sector, or as a result of performing recording / reproduction,
When many errors occur, the sector is replaced. Here, a conventional alternate sector management method will be described with reference to a flow.

FIG. 9 is a flow chart showing a flow of main processing at the time of sector check by the alternate sector management method in the conventional information recording / reproducing apparatus. In the figure, # 1 to # 9 indicate steps.

In step # 1, data is recorded in a target sector. In step # 2, the data of the target sector is reproduced. In the next step # 3, it is checked whether data is correctly recorded in the target sector.

If the data is recorded correctly,
The flow of FIG. 9 ends. On the other hand, if the data is not correctly recorded, the replacement information is registered in step # 4, and the data is recorded in the replacement area in the next step # 5. In step # 6, it is checked whether the adjacent track has been recorded.

If the adjacent track has been recorded,
In the next step # 7, the replacement information of the adjacent track is registered. Proceeding to step # 8, the data of the adjacent track is recorded in the replacement area, and the flow of FIG. 9 ends.

On the other hand, if the result of the check in the previous step # 6 indicates that the adjacent track has not been recorded, the replacement information of the adjacent track is registered in step # 9, and the flow of FIG. 9 ends. . Steps # 1 to # 9 above
By the above process, replacement information of a normal sector (alternate sector) adjacent to the defective sector is registered.

However, as described above, an information storage medium such as a magneto-optical disk has a problem that a defective sector expands to the periphery due to long-term use or the like. Therefore, an adjacent normal sector is prepared in advance as a replacement sector. Even if it is not used, if the defect is extended to another normal sector due to long-term use or aging, there is a disadvantage that data cannot be recorded and reproduced.

[0026]

According to the present invention, such an inconvenience in the conventional alternate sector management method of the information recording / reproducing apparatus, that is, a normal sector of one track or several tracks adjacent to a defective sector is previously recorded for non-recording. The replacement sector management method, which is used as a replacement sector, solves the inconvenience that recording and reproduction of valuable data becomes impossible if the defective area on the information storage medium increases due to long-term use, aging, etc. If the number of errors increases and the number of errors increases, another normal sector adjacent thereto is newly set as a replacement sector, so that a necessary number of replacement sectors can be always secured, and the reliability of data is improved. It is an object of the present invention to provide a replacement sector management method with improved performance.

[0027]

According to the present invention, firstly,
An alternate sector management method for an information recording / reproducing apparatus in which a normal sector adjacent to a defective sector on an information storage medium such as a magneto-optical disk is previously set as a non-recording alternate sector. The information is recorded, and at the time of checking, the test information is reproduced, and the number n of errors is counted. If the number n of errors is larger than a predetermined value N, the replacement for non-recording is performed. In a replacement sector management method in which another normal sector adjacent to a sector is set as a new non-recording replacement sector, a new normal sector is used.
When registering as a non-recording alternate sector,
Count and record the number m of errors in the alternate sector
Check with the number m of the counted errors.
The number of errors n when the
Is added to the non-recording alternate sector.
Of other normal sectors as non-recording alternate sectors
This is a replacement sector management method characterized by performing .

Secondly, in the first alternative sector management method, the address information of a sector newly set as a non-recording alternative sector is recorded on the information storage medium. is there.

Thirdly, in the first or second alternate sector management method, the information storage medium is connected to the information recording / reproducing apparatus.
When set, the replacement section for non-recording of the information storage medium
A replacement section that checks the number of errors
It is a method of managing stakeholders.

[0030]

[0031]

According to the present invention, in order to detect an increase in the defective area on the information storage medium due to long-term use or aging, a normal sector (adjacent to a defective sector) previously assigned to a non-recording alternate sector is detected. Test information is recorded in a normal sector), and at the time of checking performed as needed, the test information is reproduced to count the number n of errors. The counted number n of errors is larger than a predetermined value N. At this time, it is determined that the replacement sector has become a defective sector due to the spread of the defective area, and another normal sector adjacent thereto is set as a new non-recording replacement sector (replacement sector process). , as substitute sector adjacent to the defective sector is always present, alternating sections
The number of errors n
Instead of comparing the threshold N
And the number of errors n
Compared to the number of errors m, the number of errors n this time has increased.
When performing a process to set up a new replacement sector,
It is (the invention of claim 1).

Secondly, in order to shorten the time of the first check process, that is, the time for testing a normal sector previously assigned to a non-recording alternate sector, the inner and outer sectors adjacent to this alternate sector are reduced. the alternate sector management table of the track (adjacent track alternation table), the information may be provided in an area other than the user area on the storage medium, at the time of a check of the number of errors, and can examine only the adjacent tracks, substitute sector Whether to provide a new
In making the determination, the number of errors n is compared with the threshold N.
In addition, the number of errors n based on the check result
The number of errors when registering as a
When the number n of errors of
It is thus performs processing of providing a (invention of claim 2).

Third, the above first and second processes are performed by
Information storage medium to be set in the information recording / reproducing device.
By doing so, the user does not need to perform it intentionally,
The spread of defective sectors on information storage media can be quickly and
It can be grasped accurately (the invention of claim 3).

[0034]

[0035]

Embodiment 1 Next, an embodiment of a method for managing an alternate sector of an information recording / reproducing apparatus according to the present invention will be described in detail with reference to the drawings. This embodiment is corresponding to the invention of claim 1 and claim 3, it is also associated with inventions of claim 2.

In this embodiment, test data is recorded in a replacement sector (normal sector adjacent to a defective sector), and at the time of an optional check, the test data is reproduced to expand the defective area. If the number of errors exceeds a predetermined value due to the deterioration of the status of the replacement sector, a process of setting another normal sector adjacent to the replacement sector as a new replacement sector (replacement sector process) is performed. This is characterized in that a replacement sector can always be secured. Also in the alternate sector management method of the present invention, the configuration of the information reproducing apparatus is basically the same as that of FIG. 8 shown as a conventional example, and the CPU 31 performs control according to the flow of FIG.

As a method of checking test data by the alternate sector management method of the present invention, for example, the number n of errors occurring in the non-recording alternate sector is counted and counted by a known ECC method. If the number n of errors is larger than the predetermined value N, it is determined that the defective sector has already spread to the replacement sector, and another normal sector adjacent to the replacement sector is newly set as a non-recording replacement sector. Performs the setting process and does not use it for recording / reproduction thereafter. Note that instead of the number n of errors in a sector,
The number of errors in one interleave can also be used.

FIG. 1 is a flowchart showing a main flow of a replacement process at the time of recording and reproduction in the replacement sector management method of the present invention. Steps # 1 to # in the figure
9 is the same as FIG. 9, and # 11 to # 12 indicate the added steps.

In this embodiment, FIG.
Is characterized in that steps # 11 and # 12 shown in FIG. 1 are added to the flow of FIG. Therefore, the processing of steps # 1 to # 9 is the same as that of the conventional example shown in FIG.

As already described with reference to the flow of FIG. 9, when it is detected that the set replacement sector has become a bad sector, a normal sector adjacent to the sector is set as a new replacement sector. Perform processing (Step # 3)
The following flow). In this case, when another normal sector adjacent to the replacement sector that has become a defective sector has already been used and has been recorded, the replacement information of the track adjacent to the replacement sector that has become the bad sector (the replacement source address,
(Information such as the address of the replacement destination) (step # 7)
Then, the recorded data is re-recorded in the replacement area (replacement processing) (step # 8).

When another adjacent normal sector is unused, the replacement information of the track adjacent to the replacement sector which has become the defective sector is registered (step # 9). By such a replacement sector process, another normal sector adjacent to the replacement sector that has become a defective sector is newly set as a replacement sector.

As described above, in the conventional replacement sector management method, a normal sector adjacent to a defective sector is previously set as a non-recording replacement sector, and a replacement destination (replacement area) of data to be recorded in this replacement sector is set. Only the process of registering information is performed. On the other hand, in the replacement sector management method of the present invention, test data (check data) is added to the replacement sector newly set by the replacement sector processing.
Is recorded (steps # 11 and # 12), the test information is reproduced at any time, the number of errors is checked, and it is monitored whether a defective sector has been expanded.

FIG. 2 is a flow chart showing a flow of main processing at the time of checking according to the first embodiment in the alternate sector management method of the present invention. In the figure, # 21
To # 27 indicate steps.

First, in order to check which sector is the replacement sector, information on the replacement sector is read in step # 21. In step # 22, test information is reproduced from the replacement sector.

In the next step # 23, the number of errors n is determined by, for example, the ECC method. In step # 24, the threshold value N is compared with the number of errors n, and it is determined whether n> N.

If n> N, proceed to step # 25,
Check if the adjacent track is a replacement sector. If the adjacent track is not a replacement sector, a replacement process is performed in step # 26 to make the track a new replacement sector (step # 3 in FIG. 1).
To # 9, # 11 and # 12), and then proceed to step # 27.

If it is determined in step # 24 that n> N is not satisfied, the process proceeds to step # 27, and step # 27 is performed until all the replacement sectors have been checked.
The processing of 22 to # 26 is repeated. And step #
If it is detected at 27 that all the replacement sectors have been checked, the flow of FIG. 2 ends.

When it is detected that the previously set replacement sector has become a defective sector by the above-described processing, a normal sector adjacent thereto is newly set as a replacement sector. Therefore, the normal sector adjacent to the defective sector is always secured as a replacement sector, and only the normal sector outside (or inside) is used, so that the data reliability is improved. invention). By executing such a check operation every time the information storage medium is set in the information recording / reproducing apparatus, the investigation can be automatically performed at a certain time interval without the user intentionally performing the check. (The invention of claim 3 ).

[0049]

Embodiment 2 Next, a second embodiment will be described. This embodiment corresponds to the invention of claim 2, but also relates to the invention of claim 3 . In the first embodiment (the invention of claim 1) described above, when the replacement sector is checked,
A method is used in which a check target sector (a normal sector on a track adjacent to a defective sector that has already been set as a replacement sector) is detected by checking whether the adjacent sectors are replacement sectors.

The second embodiment is characterized in that a quick check operation can be performed by facilitating detection of a sector to be checked. Therefore, an adjacent track replacement table is newly provided, and when a replacement process is performed on a sector of the adjacent track, addresses such as a track number and a sector number of the adjacent track are recorded in the replacement table.

The adjacent track replacement table uses an area other than the user area on the information recording medium.
Therefore, it is possible to check only the adjacent track (the track on which the already set replacement sector exists).

FIG. 3 is a flow chart showing a main flow of a replacement process at the time of recording / reproduction in the second embodiment of the replacement sector management method of the present invention. Steps # 1 to # 12 in the figure are the same as those in FIG.
# 14 indicate added steps.

In this embodiment, FIG. 1 shows the first embodiment.
The processing of steps # 13 and # 14 shown in FIG. 3 is added to the flow of FIG. Then, in the flow of FIG. 1, after data for checking is recorded in a newly set replacement sector (normal sector adjacent to the defective sector) (steps # 11 and # 12), track information of the replacement sector is recorded. Are registered in the newly provided adjacent track replacement table (steps # 13 and # 14).

The information registered in the adjacent track replacement table is address information such as a track number and a sector number. At the time of checking, the position of the replacement sector is detected from the track information of the replacement sector registered in the adjacent track replacement table.

FIG. 4 is a flow chart showing the flow of main processing at the time of checking according to the second embodiment in the alternate sector management method of the present invention. Steps # 22 to # 26 in the figure are the same as those in FIG.
32 indicates an added step.

In the second embodiment, since the adjacent track change table is used, the tracks to be checked are limited, and the check is simplified as compared with the flow of FIG.
In step # 31, information on a replacement sector registered in the adjacent track replacement table is read.

Thereafter, the information for test of the replacement sector is reproduced and checked. If the number n of errors of the replacement sector is
If the number is larger than the threshold value N, a replacement sector is newly set on a track adjacent to the threshold value N (steps # 22 to # 2).
6). This process is repeated until all the adjacent tracks have been checked. When all the adjacent tracks have been checked, the flow of FIG. 4 ends.

As described above, by registering the information of the replacement sector in the adjacent track replacement table, only the adjacent track can be checked. Therefore, as in the first embodiment, the investigation on the sector determined to be a bad sector is omitted.

In the first embodiment described above, it is necessary to reproduce even a defective sector that has been replaced without having to check it. That is, at the time of the check, it is determined whether the adjacent track of the replaced defective sector is a normal replacement sector by checking whether the adjacent sectors are replacement sectors. However, in the second embodiment, the adjacent track replacement table is provided in an area other than the user area on the recording medium, and when the check is performed,
Since only the adjacent tracks are checked,
Checking the replacement sector and the necessary replacement sector processing
Performed quickly and easily.

[0060]

Embodiment 3 Next, a third embodiment will be described. This embodiment mainly corresponds to the first aspect of the present invention, but also relates to the first to third aspects of the present invention. In the first and second embodiments described above, it is determined whether or not to perform the alternate sector processing based on the fixed threshold N when performing the check.

On the other hand, the third embodiment is characterized in that it is determined whether or not to perform the alternate sector processing based on whether or not the number of errors has increased. For this purpose, in the third embodiment, for example, a new error count table for registering information on the number of errors by the ECC method is newly provided, and when an adjacent track is newly set as a replacement sector,
In this table, information on the number of errors m is recorded corresponding to the address of the sector.

At the time of checking, the number m of errors recorded in the error number table is compared with the number n of errors counted at the time of checking. If the number of errors increases, a new replacement sector is set. Perform processing. In the third embodiment, the number of errors is not necessarily one.
It is not necessary to perform a process of setting a replacement sector immediately after the number increases. For example, a threshold M may be provided, and a process of setting a new replacement sector may be performed according to an increase in errors that exceeds this value. .

FIG. 5 is a flowchart showing a main flow of a replacement process at the time of recording / reproducing in the third embodiment of the replacement sector management method of the present invention. Steps # 1 to # 14 in the figure are the same as those in FIG.
# 44 indicate the added steps.

In this embodiment, FIG. 3 shows the second embodiment.
The processing of steps # 41 to # 44 shown in FIG. 5 is added to the flow of FIG. Then, the same processing as in FIG. 3 is performed (steps # 1 to # 9), and check data is recorded in the newly set replacement sector (normal sector adjacent to the defective sector) (steps # 11 and #). 12).

Thereafter, the check data recorded in the replacement sector is reproduced, and the number m of errors is calculated (steps # 41 and # 43). The obtained information on the number m of errors is recorded in a newly provided error number table (steps # 42 and # 44).

The track information of the replacement sector is registered in the adjacent track replacement table (step #).
13, # 14). The checking operation is performed as follows.

FIG. 6 is a flow chart showing a flow of main processing at the time of checking according to the third embodiment in the alternate sector management method of the present invention. Steps # 22 to # 32 in the figure are the same as those in FIG.
52 indicates an added step.

In the third embodiment, information on the number of errors m is recorded using an error number table, and is compared with the counted error number n at the time of checking. The processing from reading the data for checking the replacement sector to calculating the number of errors n (steps # 31 to # 22) is the same as that in FIG.

Thereafter, in step # 51, information on the number of errors m is obtained from the error number table. In the next step # 52, the number n of errors at the time of checking and the number m of errors at the time of alternate sector processing are compared.

When the number of errors n at the time of checking is increasing (when n> m), a replacement process is performed in step # 26. Such processing is performed for all adjacent tracks.

In the above description, the second embodiment, that is, the case where the adjacent track alternation table is used, is also applicable to the first embodiment which does not use such a table. Needless to say.

[0072]

According to the present invention, the information recording / reproducing apparatus is replaced with another one.
In the sector management method, inspect the spread of defects on the storage medium
The number of errors can be detected,
Even if the number of errors is small, increase the number of errors quickly
Can be detected.

According to a third aspect of the present invention, there is provided a method for managing an alternate sector of an information recording / reproducing apparatus.
In the sector management method, the storage medium is set in the device
When you check. Therefore, the user
Check at almost regular intervals without being aware of
And become possible.

[0074]

[0075]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a main flow of a replacement process at the time of recording / reproduction in a replacement sector management method of the present invention.

FIG. 2 shows a first alternative sector management method according to the present invention;
It is a flow chart which shows the flow of the main processing at the time of a check by an example of an example.

FIG. 3 is a flowchart showing a main flow of a replacement process at the time of recording / reproduction in a second embodiment of the replacement sector management method of the present invention.

FIG. 4 shows a second alternative sector management method according to the present invention.
It is a flow chart which shows the flow of the main processing at the time of a check by an example of an example.

FIG. 5 is a flowchart showing a main flow of a replacement process at the time of recording / reproduction in a third embodiment of the replacement sector management method of the present invention.

FIG. 6 shows a third alternative sector management method according to the present invention;
It is a flow chart which shows the flow of the main processing at the time of a check by an example of an example.

FIG. 7 is a diagram showing a sector format in which a user byte is 1,024.

FIG. 8 is a functional block diagram showing an example of a configuration of a main part of a conventional information recording / reproducing apparatus.

FIG. 9 is a flowchart showing a main processing flow in a conventional information recording / reproducing apparatus at the time of a sector check by an alternate sector management method. In the figure, # 1 to # 9 indicate steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-order apparatus 2 Optical disk apparatus 3 Control part 31 CPU 32 Control memory 4 Drive part 41 Write control part 42 Read control part 5 Storage medium

Claims (3)

(57) [Claims] An alternate sector management method for an information recording / reproducing apparatus, wherein a normal sector adjacent to a defective sector on an information storage medium such as a magneto-optical disk is previously set as a non-recording alternate sector.
The test information is recorded in the non-recording alternate sector, and at the time of checking, the test information is reproduced to count the number n of errors, and the number n of errors is a predetermined value. If the value is larger than N, in a replacement sector management method for performing processing to make another normal sector adjacent to the non-recording replacement sector a new replacement sector for non-recording , the normal sector is newly added to the non-recording replacement sector . Register as a replacement sector
The number m of errors in the non-recording alternate sector
And record the number m of the counted errors.
And the number n of errors when the check is performed,
When the number n of errors increases, the non-recording
Other normal sectors adjacent to the replacement sector for non-recording
Alternate sector management characterized by performing processing as a sector
How . 2. The replacement sector management method according to claim 1, wherein address information of a sector newly set as a non-recording replacement sector is recorded on the information storage medium. 3. The method according to claim 1 , wherein when the information storage medium is set in the information recording and reproducing apparatus,
Error in the non-recording alternate sector of the information storage medium
Alternate sector management method characterized by checking the number
Law .