JPH11134808A - Disk apparatus and defect processing method to be applied thereto - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize defect alternation for a disk surface for which a defect register limit has been exceeded without disabling the surface so long as a portion of defect alternation regions of all disk surfaces in an apparatus is still vacant. SOLUTION: A position of a defect sector is searched on each disk surface Hj of each disk in a magnetic disk apparatus. At every detection of the defect sector, it is judged whether or not a defect alternation region of the disk surface Hj on which the defect sector exists is still vacant (step S11). If not vacant but there exists another disk surface having a defect alternation region with a vacant portion, i.e., in the case where it is not defect-over (step S13), a disk surface which has a defect alternation region with largest vacant portions at that time is selected, and the detected defect sector on the different disk surface is alternated with a vacant sector in the defect alternation region of the selected disk surface (steps S14 and S15).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for recording and reproducing data on and from a disk surface of a disk and a defect processing method applied to the disk drive.

[0002]

2. Description of the Related Art In general, in a disk device of this type, for example, a magnetic disk device, a disk surface of the disk is damaged during manufacturing of a disk as a recording medium or during an assembling process for mounting the disk in the magnetic disk device. May occur. If the damage to the disk surface is out of the allowable range, it is handled as a defect that makes the data recording / reproducing operation impossible.

On the other hand, a magnetic disk drive generally employs a system in which two disk surfaces per disk are used as data recording areas, and all disk surfaces of a plurality of disks are used as data recording areas. It is a target. In a magnetic disk drive, heads corresponding to the respective disk surfaces are mounted. That is, the disk surface and the head have a one-to-one correspondence, and the head number is specified as the physical address in the access operation.
The disk surface corresponding to the head number is specified.

In such a structure, not only the defect on the disk as described above, but also the disk surface is normal,
When a failure occurs on the head side, data recording / reproduction on the corresponding disk surface becomes impossible.

More specifically, in the process of assembling the magnetic disk drive, the flying height may be higher than a predetermined value due to a defective mounting state of the head during the head mounting process. The flying height is the flying height when the head is flying above the disk surface, in other words, the distance between the head and the disk. If the flying height is higher than a predetermined value, the reproduction output level of the head decreases, the error rate in data reproduction operation (the probability of data error occurrence during decoding) increases, and the probability of occurrence of a so-called read error increases. Get higher. Further, in a disk device using an MR head (a magnetoresistive head) as a head, when the flying height is lower than a predetermined value, if there is a minute projection on the disk surface, the head contacts the projection ( TA (Thermal As) where output waveform is disturbed by heat generated by collision
perity), the read error probability increases.

Furthermore, the state of the disk surface is not completely uniform, and depending on the position of the recording area, the reproduced output of the head may be lower than the reference value. Also, the inner peripheral side of the disk surface or the CDR where the relative speed between the head and the disk decreases.
When the (Constant Density Recording) method is adopted, read errors may be concentrated under specific conditions such as an outer peripheral side where a recording frequency is relatively high.

Therefore, in order to prevent the data recording / reproducing operation from being hindered by the above-mentioned disk defect or head-related trouble, for example, Japanese Patent Laid-Open No. 9-55
No. 035 has proposed a defect technique.

In this defect technique, an upper limit of the number of defects (the number of defective sectors) is set in units of disk surfaces or heads. For a disk surface having a number of defects (defective sectors) exceeding the upper limit, replacement of defective sectors is performed. It is determined that it is impossible to perform a defect process such as setting of a sector (defect registration) on the disk surface, and that the disk cannot be used. in this way,
By disabling a defect surface on which a defect exceeding the upper limit number of defects is present, it is possible to prevent data recording / reproducing operations from being disturbed by a disk defect or a head-related failure, and to prevent the defect processing from being performed. Since it is excluded, it is possible to smoothly execute defect processing on another disk surface.

[0009]

As described above, in the prior art as described in Japanese Patent Application Laid-Open No. 9-55035, an upper limit of the number of defects is set in units of disk surfaces or heads, and exceeds the upper limit. A disk surface having a number of defects (defective sectors) cannot be used because the defect registration limit is exceeded.

Further, in the prior art, although defect registration for replacing a sector in which a defect has occurred on a certain disk surface with a defect replacement area provided in a predetermined area on the same disk surface can be performed, replacement with another disk surface is possible. Could not.

For this reason, according to the prior art, when a defective sector exceeding the upper limit number of defects is detected on a certain disk surface in a magnetic disk device, that is, when a defect replacement area on the disk surface becomes full, defect registration is performed. When the limit is exceeded, there is a problem that the disk surface over the defect registration limit cannot be used, even if the defect replacement area of another disk surface still has enough room for defect registration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to enable the replacement of defects between disk surfaces so that a disk surface whose defect registration limit has been exceeded can be used in an apparatus. It is an object of the present invention to provide a disk device capable of performing defect replacement without disabling a defect unless the defect replacement area of the entire disk surface is used up, and a defect processing method applied to the device.

[0013]

According to the present invention, there is provided at least one disk having a disk surface on which a defect replacement area to which a defective sector is to be replaced is provided, the disk being provided corresponding to each disk surface of the disk. In a disk device in which data is recorded / reproduced on / from the disk surface by the head, a defective sector search unit for searching for a defective sector on each disk surface of the disk, and a defective sector is detected by the defective sector search unit A determination unit that determines whether there is a vacancy in the defect replacement area on the disk surface where the defective sector exists,
When the determination means determines that there is no free space in the defect replacement area on the disk surface where the defective sector exists, a selection means for selecting another disk surface having a free space in the defect replacement area; When a surface is selected, defect registration means for replacing the detected defective sector in a free sector of the defect replacement area on the selected disk surface is provided.

In such a configuration, as a result of the occurrence of many defects (defective sectors) on a certain disk surface, the defect replacement area is completely used up by the replacement processing (defect registration) to the defect replacement area on the disk surface. When there is no defect, that is, when the defect registration limit over which the defect replacement to the defect replacement area cannot be performed is exceeded, the defect replacement area is empty among other disk surfaces in the same disk device. When a disk surface is selected, a defective sector on the disk surface for which the defect registration limit has been exceeded can be replaced with a free sector in the defect replacement area on the selected disk surface.

As described above, according to the present invention, defect replacement (registration) is permitted between the respective disk surfaces in the same disk device. If there is a (surplus) disk surface, instead of making it unusable, a replacement process is performed using the defect replacement area of the other disk surface, thereby replacing defective sectors (defect registration) with the conventional technology. Many things have been done. That is, in the present invention, defect replacement can be performed as long as the defect replacement areas provided on all the disk surfaces of all the disks in the disk device are not used up.

Here, in order to replace a defective sector on the disk surface for which the defect registration limit has been exceeded, the disk surface having the most empty defect replacement area at that time among the disk surfaces having free areas in the defect replacement area. In other words, it is preferable to use the disk surface with the least number of defect replacements (registrations). The reason is as follows.

First, considering the efficiency of disk access when accessing a plurality of continuous sectors including a defective sector that requires access to the replacement destination, the defect replacement process uses a defect replacement area on the same disk surface. It is more preferable to use a defect replacement area on another disk surface because processing such as head switching is not required.

However, as a result of using up the defect replacement area on a certain disk surface, if another disk surface having a defect replacement area with a small space is selected for the defect replacement, the space in the defect replacement area is further reduced. As a result, there is a possibility that the defect (defective sector) on the selected disk surface cannot be replaced with a defect replacement area on the selected disk surface.

On the other hand, if another disk surface having the defect replacement area having the largest free space is selected for the defect replacement, the defect (defective sector) on the selected disk surface will also be changed. It can be replaced with a defect replacement area. In other words, by using the other disk surface having the defect replacement area with the most vacant space for defect replacement at all times, a defect (defective sector) on each disk surface can be replaced with a defect replacement area on the same disk surface as much as possible. it can.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a magnetic disk drive according to one embodiment of the present invention.

Here, three discs 1-0 to 1-2 and 6
It is assumed that the magnetic disk drive has two heads 2-0, 2-1 to 2-4, 2-5. Head 2-0, 2-1 to 2-4, 2-5
Are the disk surfaces H0, H1 to H of the disks 1-0 to 1-2.
4 and H5, the disk surfaces H0 and H
It is used for writing data to 1 to H4, H5 (data recording) and reading data from the disk surface H0, H1 to H4, H5 (data reproduction).

A large number of concentric tracks are formed on both disk surfaces of the disk 1-i (i = 0 to 2), and each track is used for positioning control or the like (such as a cylinder code indicating a cylinder number). A plurality of servo areas on which servo data is recorded are arranged at equal intervals (including burst data for indicating the position error in the cylinder indicated by the address code and the cylinder code by a waveform amplitude). These servo areas are radially arranged on the disks 1-0 to 1-2 over the respective tracks from the center. The area between the servo areas is a user area. A plurality of data sectors are set in the user area between the servo areas.

On both disk surfaces of the disk 1-i,
As shown in FIG. 2, in order to increase the format efficiency of the disk 1-i by effectively using the outer peripheral area on the disk 1-i where the physical circumference of the track (cylinder) becomes longer, The data area on the disk surface of the disk 1-i is divided into a plurality of zones in the radial direction, for example, ten zones Z.
A configuration in which the number of data sectors per cylinder (track) is different (increases in the outer peripheral zone) in each of the zones Z0 to Z9, that is, the disk transfer rate (linear recording density) is different (outer peripheral) (The faster the cylinder in the zone on the side, the faster the format configuration of the CDR system is applied.) Here, the disk transfer rate of each cylinder in one zone is equal.

Further, predetermined areas on both disk surfaces of the disk 1-i are allocated to a defect replacement area 101 for defect replacement (defect registration).
The number of sectors determined by the size of the defect replacement area 101 is the upper limit number of defects per disk surface (head). However, in the present embodiment, even if the number of defective sectors on the disk surface exceeds the upper limit number of defects, the number of defective sectors on all disk surfaces of all the disks 1-0 to 1-2 mounted on the disk device of FIG. If the total number does not exceed the sum of the upper limit number of defects of all the disk surfaces (six surfaces), unlike the prior art, the disk cannot be disabled. In FIG. 2, the defect replacement area 10
1 is provided on the inner peripheral side of the disk surface of the disk 1-i, but may be provided in another area. In addition, they may be distributed in a plurality of regions (for example, regions adjacent to each zone).

The disks 1-0 to 1-2 are rotated at high speed by a spindle motor (SPM) 3. Head 2-0 to 2-5
Is mounted on a head moving mechanism called a carriage 4, and the movement of the carriage 4 simultaneously causes the disc 1-0 to move.
Move in the radial direction of 1-2. The carriage 4 is driven by a voice coil motor (VCM) 5.

The spindle motor 3 controls a control current (SPM) by a spindle motor driver (SPM driver) 6.
Current), the voice coil motor 5 receives a control current (VCM current) from a voice coil motor driver (VCM driver) 7. SPM driver 6
The VCM driver 7 is integrated as a double driver. The VCM driver 7 is controlled according to a servo process (head positioning control process) by a servo circuit 10b and the CPU 11 described later.

Each of the heads 2-0 to 2-5 is connected to a head amplifier circuit (head IC) 8 mounted on, for example, a flexible printed wiring board (FPC). The head amplifier circuit 8 selects the heads 2-0 to 2-5, and selects the selected head 2
a head amplifier for amplifying an analog output (analog reproduction output) read by the head 2-j, which controls input / output of a read / write signal between the head 2-j (j is any of 0 to 5); And a write driver (both not shown) for outputting a write signal (write current) to the head 2-j in accordance with the write data sent from the read / write circuit 9.

The read / write circuit (R / W circuit) 9
An analog output (read signal of the head 2-j) read from the disk surface Hj by the head 2-j and amplified by the head amplifier circuit 8 (internal head amplifier) is input to perform signal processing necessary for a data reproducing operation. Decoding function (read channel) and encoding function (write channel) for performing signal processing necessary for recording data on the disk surface Hj
Having.

The interface circuit 10a includes the CPU 1
1 and a circuit for exchanging various interface signals and data with the HDC 14, and the servo circuit 10b
This is a circuit for processing the servo data output from the write circuit 9. The servo circuit 10b extracts address information and burst data from the servo data,
Output to 1. The interface circuit 10a and the servo circuit 10b are configured by, for example, the gate array 10.

The CPU 11 is a microprocessor constituting a control device of the magnetic disk drive. The CPU 11 operates based on a control program stored in a ROM (Read Only Memory) 12, and controls each unit in the magnetic disk device. That is, the CPU 11 drives and controls the voice coil motor 5 via the VCM driver 7 in accordance with the address information and the burst data extracted by the servo circuit 10b, thereby seeking the heads 2-0 to 2-5 to the target positions. Performs well-known control such as positioning control and read / write data transfer control by controlling the HDC 14, and performs defect processing directly related to the present invention.

The CPU 11 stores a read only memory (ROM) storing a control program for controlling the entire magnetic disk drive including a defect processing routine.
y) 12 and an EEPROM (Electrically Erasable and Programmable) as a rewritable non-volatile memory used for storing parameters for controlling the magnetic disk drive.
rammable Read Only Memory) 13 is connected. In the EEPROM 23, for each disk surface H0 to H5 (or heads 2-0 to 2-5), for each defective sector (sector where a defect exists) on the disk surface,
A defect information area 13 storing a group of defect information having defective sector information indicating the defective sector position and alternative destination sector information indicating an alternative destination of the defective sector.
0 is reserved.

The CPU 11 is also connected with an HDC (disk controller) 14. The HDC 14 forms an interface with a host system (not shown), controls communication of commands and data with the host system, and communicates with the disks 1-0 to 1-2 via the read / write circuit 9. Controls the communication of data between This H
The DC 14 is, for example, a RAM or the like for temporarily storing read data in sector units read from the disks 1-0 to 1-2 and write data to be written to the disks 1-0 to 1-2. Buffer memory (buffer R
AM) 15 are connected.

Next, the defect processing in the magnetic disk drive having the configuration shown in FIG. 1 will be described with reference to the flowcharts shown in FIGS. In the defect processing of the present embodiment, in the inspection process after the magnetic disk drive is assembled, a predetermined start command is given from the host system to the magnetic disk drive, and
According to the control program stored in the OM 12, the CP
This is performed as follows by U11.

First, the CPU 11 searches for defective sector positions (defect search) on the disk surfaces H0, H1 to H4, and H5 of the disks 1-0 to 1-2 mounted on the magnetic disk device (drive). A variable j for specifying the disk surface to be set and a variable i for specifying the zone position are both initialized to, for example, 0 (step S1).

Next, the CPU 11 starts a process of searching for a defective sector position in the entire area of the zone Zi (indicated by the variable i) on the disk surface Hj (in the disk indicated by the variable j) (step S2). ). In this defective sector position search process, test data is written in units of sectors for the entire area of the zone Zi on the disk surface Hj, and the write data is read every time test data for one sector is written, and whether or not the data was read normally is determined. Is determined. After the writing of the test data to the entire area of the zone Zi is completed, the write data may be read in sector units to determine whether the data has been read normally.

Each time the CPU 11 executes the defective sector position search processing of step S2 for one sector, that is, each time it is determined whether or not one sector has been read normally, the sector is determined as a defective sector ( Defect)
Is determined (step S3).

If it is not a defective sector, the CPU 1
1 checks whether a defective sector search process has been performed for all areas of the zone Zi on the disk surface Hj (Step S).
4) If an unsearched area remains, step S2
Continue the defective sector search processing.

On the other hand, if it is a defective sector, that is, if a defective sector is detected, the CPU 11 executes a defect registration routine described below in accordance with the procedure shown in the flowchart of FIG. 4 (step S5).

First, the CPU 11 checks whether or not there is an empty space in the defect replacement area 101 secured in a predetermined area of the disk surface Hj (ie, whether or not defect registration is possible on the disk surface Hj) ( Step S1
1) If there is a vacancy, the defect replacement area 1
The defect registration (substitution process) for substituting the detected defective sector for the empty sector No. 01 is performed (step S).
12). The defect registration in step S12 is as follows.
This is performed by generating defect information having defective sector information indicating the position of the defective sector and replacement destination sector information indicating the replacement destination of the defective sector, and registering the defect information in the defect information area 130 in the EEPROM 13.

After executing the defect registration in step S12, the CPU 11 proceeds from the defect registration routine (step S5) to step S4. On the other hand, if there is no free space in the defect replacement area 101 on the disk surface Hj, the CPU 11 determines that the disk surface Hj has exceeded the defect registration limit, and proceeds to step S13. In this step S13, the CPU 11 determines the disk surfaces H0, H1 to H1 of the disks 1-0 to 1-2.
It is checked whether there is a disk surface having an empty defect replacement area 101 among the disk surfaces of H4 and H5 except the disk surface Hj. Here, a state in which there is no disc surface having a free defect replacement area 101 is called defect over. Therefore, the step S13 is to check whether or not the defect is over.

If the defect is not over, that is, the disk surface H where the defective sector is detected is determined.
If there is a disk surface having a vacant defect replacement area 101 in the disk surfaces other than j, one disk surface, for example, the defect replacement area 101 having the largest vacancy at that time is selected from the disk surfaces. The disk surface Hk (k is any one of 0 to 5, where k ≠ j), that is, the disk surface Hk with the smallest number of registered defects is selected (step S14). In order to efficiently perform the processing in step S14, the number of empty sectors in the defect replacement area 101 of each of the disk surfaces H0 to H5 is stored in a rewritable nonvolatile storage means, for example, a predetermined area of the EEPROM 13, The defect replacement area 1
Every time a defect is registered to 01, EEPRO
The CPU 11 decrements the corresponding number of free sectors in the M13 so that the latest number of free sectors in the defect replacement area 101 of each of the disk surfaces H0 to H5 can be always obtained simply by referring to a predetermined area in the EEPROM 13. Good to do.

When the CPU 11 selects the disk surface Hk with the smallest number of registered defects, the CPU 11 selects the disk surface Hk.
Defect registration (substitution processing) for substituting the defective sector on the detected disk surface Hj with the empty sector in the k defect substitution area 101 is performed (step S1).
5). In the defect registration in step S15, similarly to the defect registration in step S12, defect information having defect sector information indicating a position of a defective sector and replacement destination sector information indicating a replacement destination of the defective sector is generated. Then, the registration is performed in the defect information area 130 in the EEPROM 13.

Thus, even if there is no free space in the defect replacement area 101 on the disk surface Hj,
It is not necessary to make j unusable, and the normal area of the disk surface Hj can be used effectively. In order to use the defect replacement area on the same disk surface for the defect replacement processing as much as possible in consideration of the efficiency of disk access, it is necessary to set the defect replacement area 101 on the disk surface Hj when there is no free space on the disk replacement surface. As described above, as a replacement destination of the defective sector on Hj, as described above, the defect replacement area 10 of the disk surface Hk (
Although it is preferable to use the method 1), the disk surface Hj
Any disk surface having a defect replacement area 101 with an empty space may be used as long as only the purpose of enabling the use of.

After executing the defect registration in step S15, the CPU 11 proceeds from the defect registration routine (step S5) to step S4. On the other hand, in the case of the defect over, that is, when there is no disk surface having the free defect replacement area 101 in the disk surfaces other than the disk surface Hj in which the defective sector is detected (that is, all the disk surfaces H0 to H5). In the case where there is no free space in the defect replacement area 101), the CPU 11 returns a predetermined code indicating a defect over to the host system via the HDC 14 (to that effect).
And terminate abnormally.

When the CPU 11 searches for a defective sector in all areas of the zone Zi on the disk surface Hj (step S4), if j = 5 is not satisfied (step S4).
6), that is, if the defective sector is not searched for in the zone Zi on the disk surface H5, j is incremented by 1 (step S).
7) The process proceeds to a defective sector position search process (step S2) for the entire area of the zone Zi of the disk surface Hj indicated by j after +1.

On the other hand, if j = 5 (step S
6) That is, if the search is for a defective sector in the zone Zi of the disk surface H5 (final disk surface H5), the CPU 1
No. 1 determines that the defective sector search for the zones Zi of all the disk surfaces H0 to H5 in the drive has been completed, and determines whether i = 9 (step S).
8).

If i = 9 is not satisfied, that is, if it is not a search for a defective sector in the zone Z9 of the disk surface H5, the CPU 11 increments i by 1 (step S9).
The process proceeds to the defective sector position search processing (step S2) for the entire area of the zone Zi indicated by i after +1 on the disk surface Hj. On the other hand, if i = 9, that is, if it is a defective sector search in the zone Z9 (final zone Z9) of the disk surface H5, the CPU 11
Determines that the processing has been completed for all the areas of all the disk surfaces H0 to H5 in the drive, and notifies the host system of normality (by returning a predetermined code indicating that, by the HDC 14). Then, the defect processing ends normally (step S10).

The normal disk access in the magnetic disk device normally terminated in this way is performed as follows. First, the CPU 11 refers to the defect information registered in the defect information area 130 in the EEPROM 13 to check whether or not the access destination has a defective sector (defect). If there is a defective sector, the CPU 11 determines the replacement destination of the defective sector based on the replacement destination sector information that is set in a pair with the defect sector information indicating the defective sector in the corresponding defect information. Identify the sector and access the replacement destination sector. Here, the defect information area (130)
Are rewritable nonvolatile storage means other than the EEPROM 13, for example, the disk surfaces H0 and H0 of the disks 1-0 to 1-2.
They may be secured in predetermined areas H1 to H4 and H5. In this case, a part of a specific area (a so-called system area) that is not open to the user may be assigned to the defect information area.

In the above embodiment, for simplicity of explanation, it has been described that whether or not a sector is defective is determined by writing / reading test data to each sector once. In terms of the reliability of the disk device, test data is repeatedly written / read to / from each sector of the drive a plurality of times, and the read error rate (for example, whether or not an error has occurred at least once) is determined based on the read error rate. It is better to determine whether or not it is a defective sector. When an MR head is used for the heads 2-0 to 2-5, the flying height of the head is lowered from a normal use state (this can be realized by lowering the rotation speed of the spindle motor 3). If a search for a defective sector position is performed, writing / reading (recording / reproducing) is performed in a normal state.
Since there is a possibility that a sector having minute protrusions that does not hinder the detection of a defective sector may be detected as a defective sector, a more reliable defective sector position search can be performed.

In the above embodiment, the case where the defect registration processing is performed every time one defective sector is detected has been described. However, each time one defective sector is detected, the position of the defective sector is indicated. E for defective sector information
It is stored in a memory such as the EPROM 13, and after the defective sector search processing for all the disk surfaces H0 to H5 is completed, the defect registration processing for each defective sector indicated by the stored defective sector information is performed. No problem.

In this case, from the viewpoint of disk access efficiency, a defective sector on each disk surface Hj (j = 0 to 5) is used until the defect replacement area 101 on the same disk surface Hj is completely used.
In the case where an unprocessed defective sector remains even after the defect replacement area 101 has been used up, another disk surface having a space in the defect replacement area 101 is used, for example, to replace the defect replacement area with the largest space. Area 1
01, that is, from the disk surface having the smallest number of defective sectors, until the defect replacement area 101 on the disk surface is completely used.

In the above embodiment, the disk 1-0
1-2 have been described as applying the format configuration of the CDR system, but the present invention is not limited to this. Also, the number of disks is not limited to three, but at least one.
Any magnetic disk device may be used as long as it is mounted and capable of recording and reproducing on at least two disk surfaces. Further, the present invention can be applied to all data recording / reproducing devices such as a floppy disk device and a magneto-optical disk device having a disk (recording medium) on which recording and reproduction are performed by a head, in addition to the magnetic disk device.

[0053]

As described above in detail, according to the present invention, the defect replacement is permitted between the respective disk surfaces in the same disk device. If there is a free disk surface in the area, use the defect replacement area of the other disk surface instead of making it unusable, and use the disk surface over which the defect registration limit has been exceeded by performing replacement processing. In addition, replacement of defective sectors can be performed more frequently than in the prior art.

Further, according to the present invention, in order to replace a defective sector on the disk surface for which the defect registration limit has been exceeded, a defect replacement area having the largest vacancy at that time among the disk surfaces having a vacancy in the defect replacement area. By using defective disk surfaces, defective sectors on each disk surface can be replaced by defect replacement areas on the same disk surface as much as possible, and the efficiency of disk access accompanying access to the replacement destination is minimized. Can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a format example of a disk 11-i (i = 0 to 2) in FIG.

FIG. 3 is an exemplary flowchart for explaining the procedure of a defect process according to the embodiment;

FIG. 4 is a flowchart for explaining a detailed procedure of a process (defect registration routine) in step S5 in FIG. 3;

[Explanation of symbols]

1-0 to 1-2, 1-i Disk 2-0 to 2-5 Head 11 CPU (Defect sector search means, determination means, selection means, defect registration means) 12 ROM 13 EEPROM 101 Defect Replacement area 130: Defect information area H0 to H5: Disk surface Z0 to Z9: Zone

Claims (4)

[Claims] At least one disk surface having a defect replacement area for replacing a defective sector is provided.
A disk device comprising a plurality of disks, and a head provided corresponding to each disk surface of the disk for recording and reproducing data on the disk surface, wherein a defect for searching for a defective sector on each disk surface of the disk is provided. When a defective sector is detected by the defective sector searching means, a determining means for determining whether or not there is an empty space in the defect replacement area on the disk surface where the defective sector exists; When it is determined that there is no free space in the defect replacement area on the disk surface where the defective sector exists, a selection unit for selecting another disk surface having a free space in the defect replacement area, and a disk surface is selected by the selection unit. If there is a blank sector in the defect replacement area on the selected disk surface, And a defect registration unit for replacing the detected defective sector. 2. A disk drive having at least one disk surface on which a defect replacement area for replacing a defective sector is located.
A disk device comprising a plurality of disks, and a head provided corresponding to each disk surface of the disk for recording and reproducing data on the disk surface, wherein a defect for searching for a defective sector on each disk surface of the disk is provided. When a defective sector is detected by the defective sector searching means, a determining means for determining whether or not there is an empty space in the defect replacement area on the disk surface where the defective sector exists; If it is determined that there is no free space in the defect replacement area on the disk surface where the defective sector exists, the defect replacement area having the most space at that time is selected from the other disk surfaces having free space in the defect replacement area. Selecting means for selecting a disk surface to have, and selecting the disk surface by the selecting means. And a defect registering means for replacing the detected defective sector in a free sector of the defect replacement area on the selected disk surface when the error is detected. 3. A disk drive having at least one disk surface on which a defect replacement area for replacing a defective sector is located.
A defect processing method applied to a disk device comprising a plurality of disks, and recording and reproducing data on and from the disk surface by a head provided corresponding to each disk surface of the disk, comprising: Each time a defective sector is detected, it is determined whether or not there is a vacancy in the defect replacement area on the disk surface where the defective sector exists. If it is determined that there is no free space in the defect replacement area, another disk surface having free space in the defect replacement area is selected.If another disk surface having free space in the defect replacement area can be selected, The detected defective sector is replaced with a free sector in a defect replacement area on a disk surface. Defect processing method. 4. A disk drive having at least one disk surface on which a defect replacement area to be replaced with a defective sector is located.
A defect processing method applied to a disk device comprising a plurality of disks, and recording and reproducing data on and from the disk surface by a head provided corresponding to each disk surface of the disk, comprising: Each time a defective sector is detected, it is determined whether or not there is a vacancy in the defect replacement area on the disk surface where the defective sector exists. When it is determined that there is no free space in the defect replacement area, a disk surface having a defect replacement area with the largest space at that time is selected from other disk surfaces having free space in the defect replacement area, If the disc surface with the most empty defect replacement area can be selected, the diff A defect processing method, wherein the detected defective sector is replaced with a vacant sector in a defect replacement area.