JPH0660551A - Information storage device - Google Patents

Abstract

(57) [Summary] [Purpose] The same replacement information is recorded in multiple locations to improve reliability. [Structure] The information storage medium 5 includes control units 4a and 4b for reading and writing information, and an information storage memory 3b. When actually performing the replacement process, the same replacement process information is recorded at a plurality of locations on the track. For example, track 3
Each book is set as one set, four areas are provided, and the same replacement processing information is stored in each area to improve reliability.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an information storage device, and more particularly to a controller device in a direct access information storage device having an information storage medium. For example,
It is applied to an optical disk drive device.

[0002]

2. Description of the Related Art Error correction processing is performed on data reproduced for each unit area, and when a predetermined number of errors or more are detected, the data is replaced with an alternate sector for recording.
As a means for preventing the loss of recorded data, for example, Japanese Patent Laid-Open No. 1-196775 discloses "Data recording /
The replacement processing method in the reproducing apparatus has been proposed. In this publication, at the time of reproduction, the data recorded on the magneto-optical disk is read by the sector data reading means for each sector. This data is sent to the error correction means and subjected to error correction processing. Here, the number of errors contained in one sector is obtained and sent to the error number determination means. It is determined whether the number of errors in one sector is greater than or equal to a predetermined threshold value A. When it is determined that the number of errors is greater than or equal to A, the data is corrected by the correction unit and then this data is recorded by the replacement sector by the replacement sector. As a result, it is possible to prevent the recorded data from being lost due to a growth defect due to a change with time.

Further, the notification processing can be speeded up by updating the replacement sector allocation status when the replacement sector is allocated to the sector in the replacement area for the faulty sector and holding the updated information in a new manner. As a means for preventing the influence on the treatment, for example, JP-A-64-78
The "replacement sector management system" is proposed in Japanese Patent No. 468. In this publication, the alternate sector management control means enables the management data recording means to read / write the alternate sector allocation information, updates the recording information each time the alternate sector is allocated, and outputs it to the higher order. It has a function. When a substitute sector is assigned to a sector in the replacement area for the failed sector, the replacement sector management control means updates the recorded contents of the management data recording means according to the center usage status in the replacement area, and the latest replacement is always performed. The sector allocation status is held, and the data in the management data recording means is read and output to the higher order. This makes it possible to speed up the notification process to the upper layer, and to prevent the online process from being affected.

As described above, in the conventional information storage device, the replacement processing information is read from the information recording medium during the initialization, and when the replacement processing occurs in the reading / writing after the completion of the initialization, the information is used as the basis. Is to be processed.

FIG. 7 is a diagram showing a conventional track map. When allocating a substitute sector to a sector in the replacement area for a failed sector in the general area of the disk unit, the replacement sector management control unit matches the recorded contents of the management data recording unit with the sector usage status in the replacement area. It is updated so that the latest replacement sector allocation status is always maintained. However, there is a problem in terms of reliability because the replacement processing information area is provided only at one location in the portion A in the figure.

FIG. 8 is a flow chart for explaining the operation of the conventional controller device. When the replacement processing information starts to be read, first, r = initial value, and i =
Set to 1 (S1). It should be noted that r is a retry count, and i is a symbol indicating the order of the replacement process information. Next, the area Ai is read, and it is determined whether or not the processing has ended normally (S2). If the process ends normally, the next process is executed (S
3). If it does not end normally, it is judged whether r = 0 (S4). If not r = 0, r = r-1 is set (S4).
5), return to S2. If r = 0, then it is determined whether i ≧ 4. If i ≧ 4, it is determined that an error has occurred. i ≧
If not 4, then i = i + 1 (S7) and r = initial value (S8), and the process returns to S2.

[0007]

[Purpose] The present invention has been made in view of the above-mentioned circumstances, and is intended to improve reliability by recording replacement processing information in a plurality of locations with the same replacement processing information. The purpose of the present invention is to provide an information storage device in which the efficiency of the initialization time is improved by reading the data one by one when the head cannot read.

[0008]

In order to achieve the above object, the present invention provides (1)
The information storage medium has a control unit for reading / writing information and an information storage memory, and is secured in advance when writing fails in an area on the information storage medium to be written at the time of writing. In a direct access information storage device that employs a method of performing replacement processing, which is writing to the spare area that has failed,
Recording a plurality of identical pieces of replacement processing information on the information storage medium, and (2) failing to read the first replacement processing information in the replacement processing information read operation during initialization processing of the information storage medium. Then, the operation of reading the nearest replacement processing information is repeated for the plurality of recorded replacement processing information, and further, (3) all the plurality of replacement processing information finally present in (2) above. When the reading of the replacement processing information fails, the replacement processing information that fails to be read last is read again, and when it fails, the operation of reading the nearest replacement processing information is repeated for a plurality of recorded replacement processing information. Further, (4) In the above (3), when the above operation is repeated a certain number of times and all readings fail, the information storage medium in use As unavailable, prohibits the access operation to the information storage medium is obtained by said to report abnormality to the host device. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of an information storage device according to the present invention, in which 1 is a host device,
2 is an information storage unit, 3 is a control unit, 3a is a CPU (central processing unit), 3b is a control memory, 4 is a drive unit, 4a is a write control unit, 4b is a read control unit, and 5 is an information recording medium. . The information storage unit 2 includes a control unit 3 and a drive unit 4
Composed of. The control unit 3 includes a CPU 3a and a control memory 3b. The drive unit 4 is composed of a write control unit 4a and a read control unit 4b. The CPU 3a in the control unit 3 controls the write control unit 4a and the read control unit 4b in the drive unit 4,
The write control unit 4a performs control for writing to the information storage medium 5, and the read control unit 4b controls reading from the information storage medium 5.

The information storage device according to the present invention performs the following operations. To increase reliability, the same information is recorded in multiple places. When the information is read, the first information is read, and if a read error occurs, the same information is read until the correct number of retrials can be correctly read. If the information cannot be read, the next information is read. Read and perform the same operation as the first one. This operation is repeated for the number of pieces of replacement processing information. When the replacement processing information is read, if the information is redrawn one by one, the initialization processing time may be long when the information in early order cannot be read. In order to shorten the initialization processing time when an abnormality occurs, each information is read once without being relit. In order to shorten the initialization processing time at the time of occurrence of an abnormality, when reading of all the information points fails, the retorting is performed from the nearest information instead of returning to the first one and retriing. In order to shorten the initialization processing time in the event of an abnormality,
The operation is stopped for a certain period (number of times), the subsequent access to the medium is prohibited, and the abnormality is reported to the host device.

2A and 2B are views showing an information storage medium according to the present invention. If the recording surface of the optical disc is large or has many defects, the redundant word ECC (Error
Even if data is recorded with a Correction Code), error correction may not be possible and correct reproduction may not be possible. Therefore, at the time of recording, immediately after writing the data, the data is read, and it is determined (verified) whether or not the data can be correctly reproduced. If it cannot be played correctly, you need to take this data to another area. This operation is defect processing. Physical addresses (track numbers and sector numbers) on the disc are sequentially assigned from the inner circumference side (or from the outer circumference side) as shown in FIG. The track 0 has a structure as shown in FIG.

3 (a) and 3 (b) show the spiral shape of FIG.
A model in which tracks in the media are arranged vertically one by one.
It is a figure showing a formula. Replacement processing information for track 0
A₁Are stored, and track n and track n are sequentially stored.
+1, ... Replacement processing information for track N and track N + n
A₂,…, A₃, A _FourIs remembered. In the present invention
Is A₁= A₂= A₃= A_FourIs. Track 0 is a figure
It has the configuration of (b), and B in the figure is the replacement source address.
Indicates a pair of replacement addresses, and the replacement where this pair exists
Stored for a few minutes. If there is a large amount, it will span sectors
Is stored. The header indicates how many B pairs are present.

FIG. 4 is a diagram for explaining how to record the replacement processing information according to the present invention. For example,
Three tracks are set as one set, and four areas are provided as shown by A1 to A4 in the figure, and the same information is stored in each area. The information is stored by the number of replacements in which the information shown in FIG. In addition, 1 to 4 of A1 to A4 correspond to symbols of i indicating the order of the replacement process information.

Next, another embodiment (claim 4) of the information storage device according to the present invention will be described. In carrying out the replacement process in the information storage device shown in FIG. 1, there are a plurality of locations as shown in FIG.
The same replacement processing information is recorded in (location). On the other hand, in the initialization process in the information storage device, the replacement process information (A
1 to A4) will be described with reference to FIG. The replacement processing information (A1 to A4) is read using the function of the read control unit 4b shown in FIG.
When A4 cannot be read out, the retorting is performed as shown in FIG. When the operation of section C in the figure is performed a certain number of times and all readings have failed, the control section 3 shown in FIG. 1 determines that the information storage medium 5 in use cannot be used, and the information is used by the host device 1. Report impossible. At the same time, access to the information storage medium 5 is prohibited internally. That is,
Even if a command to access the information storage medium 5 is received from the higher-level device 1, the access prohibition is reported.

FIG. 6 is a flow chart for explaining the operation of the information storage device according to the present invention. When the reading of the replacement processing information is started, first, the retrait count r is initialized (S1), and then i indicating the number of the replacement processing information is set to 1 (S2). The replacement process information Ai is read, and it is determined whether it is a normal end (S4). If it is a normal end, the next process is executed (S4). If not normally completed, it is then determined whether i = 4 (S5). If not i = 4, i = i + 1 is set (S6), and the process returns to S4. i
= 4, it is determined whether r = 0 (S7), and r =
If 0, it is an error. If r = 0, then r = r +
1 (S8) and i = 3 (S9). Next, Ai is read, and it is determined whether or not the process has ended normally (S10). If the process has ended normally, the process proceeds to S4. I =
It is judged whether it is 1 (S11), and if i is not 1, i
= I−1 (S12), and the process goes to S10. If i = 1, r = r-1 is set (S13), and then it is determined whether or not r = 0 (S14). If r = 0, an error occurs. r =
If not 0, i = 2 is set (S15), and the process returns to S4.

[0016]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1: Since the same replacement processing information is recorded at a plurality of places, reliability is improved. (2) Effect corresponding to claim 2: When some of the alternation processes cannot be read, the reading is performed once for each place, so that the initialization time efficiency is improved. (3) Effect corresponding to claim 3: When attempting to read a plurality of locations of the replacement processing information one at a time and all are unsuccessful, the retorting is performed from the nearest record, so the efficiency of the initialization time is improved. (4) Effect corresponding to claim 4: The reliability is improved by performing the operation of reading the replacement processing information a certain number of times, and prohibiting subsequent medium access when the replacement processing information cannot be read.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of an information storage device according to the present invention.

FIG. 2 is a diagram showing an information storage medium according to the present invention.

FIG. 3 is a diagram showing a track map according to the present invention.

FIG. 4 is a diagram for explaining how to record replacement processing information according to the present invention.

FIG. 5 is a diagram for explaining an operation when reading replacement processing information according to the present invention.

FIG. 6 is a flowchart for explaining the operation of the information storage device according to the present invention.

FIG. 7 is a diagram showing a conventional track map.

FIG. 8 is a flowchart for explaining the operation of the conventional information storage device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Host device, 2 ... Information storage part, 3 ... Control part, 3a ... C
PU (Central Processing Unit), 3b ... Control memory, 4 ... Drive section, 4a ... Write control section, 4b ... Read control section, 5 ... Information recording medium.

Claims (4)

[Claims] 1. An information storage medium comprising a control unit for reading and writing information and an information storage memory, and when writing fails in an area on the information storage medium to be written at the time of writing, In a direct access information storage device that employs a system for performing replacement processing, which is writing for a failed portion, to a previously reserved alternative area, recording a plurality of identical replacement processing information on the information storage medium. An information storage device characterized by. 2. A plurality of operations recorded when initializing the information storage medium and failing to read the first replacement processing information during the replacement processing information reading operation, and then reading the nearest replacement processing information. The information storage device according to claim 1, wherein the replacement processing information is repeated. 3. When all the plurality of pieces of replacement processing information that finally exist fail to be read, the replacement processing information that fails to be read last is read again, and when it fails, the nearest replacement processing is performed next. 3. The information storage device according to claim 2, wherein the operation of reading information is repeated for a plurality of pieces of recorded replacement processing information. 4. When the operation is repeated a certain number of times and all the readings have failed, it is determined that the information storage medium being used cannot be used, and the access operation to the information storage medium is prohibited. The information storage device according to claim 3, wherein an abnormality is reported to the device.