JPH10308087A - Disk restoring method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device to secure reproduction of at least one part by rewriting a link pointer in a first or second parts table to a pointer without a link in a parts table series, when plural same parts tables having the parts table number of the link pointer exist in parts tables connected in serial by the link pointer. SOLUTION: When a link pointer to be E3 in a parts table of (2B) becomes 18 due to some cause and a link pointer 18 exists in parts tables of (03) and (2B), link pointers 18, 1F, 2B constitute a loop and there is the possibility that a track corresponding to this parts table series cannot be reproduced. At this time, a link pointer in the succeeding parts table of (2B) is rewritten to 00. Thereby, a segment corresponding to a parts table of (E3) cannot be reproduced, but segments corresponding to parts tables from (03) to (2B) can be reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for repairing a disk such as a mini disk.

[0002]

2. Description of the Related Art In a mini-disc apparatus disclosed in Japanese Patent Laid-Open Publication No. Hei 7-65544, UTO is used for one track (song).
The parts table series serially linked by the link pointer of the parts table of C (User TOC: User's Table Of Contents) is traced in the order of the parts table series, and the number of links is the total number of parts tables.
If it exceeds 55, that is, if there is a loop in the part table series and it is endless, it is determined that there is an error in the link pointer.

[0003]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. 7-65544
In the case of the mini-disc device disclosed in the publication, if an error in the link pointer is detected, the disc cannot be reproduced as a disc error, so that the entire track cannot be reproduced.

An object of the present invention is to provide a disk repair method and apparatus capable of securing at least a part of reproduction even when a loop exists in a part table series serially connected by a link pointer of a UTOC part table. It is to be.

[0005]

According to the disk repair method of the present invention, a UTOC recorded on a disk (12) is provided.
Include the start address and end address of a predetermined segment of the disk (12), and a link pointer indicating the part table number of the part table corresponding to the segment following the segment. And in such a disk repair method,
When there are a plurality of part tables having the same part table number of the link pointer in the part table series serially linked by the link pointer, the link pointer of the first or second part table in the part table series is linked. Rewrite without.

[0006] The "plurality" of "plurality of part tables having the same part table number of the link pointer" means not only two but also three or more.

As a result, the loop in the part table series is removed, so that at least a part of the reproduction is secured. It is better to rewrite the link pointer of the second part table in the part table series without link.
Reproduction can be increased more than rewriting the link pointer of the second part table without a link.

According to the disk repair apparatus (10) of the present invention, each part table of the UTOC recorded on the disk (12) includes a start address and an end address of a predetermined segment of the disk (12), and the segment address. And a link pointer indicating the part table number of the parts table corresponding to the segment following the following. Then, the disk repair apparatus (10) includes the following (a) and (b)
have. (A) Link pointer reading means for reading a link pointer of each part table of the part table series serially connected by the link pointer. (B) In the part table series whose link pointer is read by the link pointer reading means. Link pointer rewriting means for rewriting the link pointer of the first or second part table in the part table series without link when there are a plurality of part tables having the same part table number of the link pointer.

The disk repair apparatus (10) includes not only a disk repair apparatus for both recording and reproduction, but also a recording-only disk repair apparatus and a reproduction-only disk repair apparatus.

As a result, the loop in the parts table series is removed, so that at least a part of the reproduction is secured. It is better to rewrite the link pointer of the second part table in the part table series without link.
Reproduction can be increased more than rewriting the link pointer of the second part table without a link.

According to the disk repair apparatus (10) of the present invention, each part table of the UTOC recorded on the disk (12) includes a start address and an end address of a predetermined segment of the disk (12), and the segment address. And a link pointer indicating the part table number of the parts table corresponding to the segment following the following. The disk repair device (10) has the following (a) and (b). (A) Link pointer reading means for reading the link pointer of each part table. (B) If there is a part table having a link pointer of the same part table number as the already read part table number as a link pointer of the part table, the part table of that part table is displayed. Link pointer rewriting means for rewriting link pointer without link

When a part table having a link pointer of the same part table number as the part table number already read as a link pointer of the part table appears, the link pointer of the part table is rewritten without link, and the part table series is rewritten. Is removed, so that at least a part of the reproduction is secured.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram of the mini disc device 10 for reproducing and recording the mini disc 12. The spindle motor 14 drives the mini disc 12 to rotate. The optical head 16 includes an optical system including a laser diode, a deflection beam splitter, an objective lens 18 and the like, and a detector for detecting reflected light, and irradiates the mini disc 12 with laser light during recording / reproduction. The objective lens 18 is held by a two-axis mechanism 20 so as to be displaceable in the radial direction and the approaching / separating direction of the mini-disc 12.
The whole 16 can be moved in the disk radial direction by a sled mechanism 22. The magnetic head 24 is arranged to face the optical head 16 with the mini-disk 12 interposed therebetween, and applies a magnetic field modulated by the supplied data to the mini-disk 12.

During a reproducing operation, information recorded on the mini disk 12 is detected by the optical head 16 and supplied to the RF amplifier 26. The servo circuit 28 generates various servo drive signals based on a tracking error signal and a focus error signal from the RF amplifier 26, a track jump command, a seek command, rotation speed detection information, and the like from the system controller 30, and generates the two-axis mechanism 20 and the thread. By controlling the mechanism 22, focus and tracking control is performed, and the spindle motor 14 is controlled to a constant angular velocity (CAV) or a constant linear velocity (CL).
V). The EFM / CIRC encoder / decoder 32 receives the reproduced RF signal from the RF amplifier 26,
Decoding processing such as FM demodulation and CIRC is performed, and the data is temporarily written into the buffer RAM 36 by the memory controller 34. The data written in the buffer RAM 36 is read out by the AIRAC encoder / decoder 38 at a predetermined timing, subjected to reproduction signal processing such as decoding processing for audio compression processing, and converted into an analog signal by the D / A converter 40. The audio signal is sent from an audio output terminal 42 to a predetermined amplifier circuit, and is reproduced and output as, for example, L and R audio signals. The address decoder 44 receives address information from the RF amplifier 26, and the address information is output from the address decoder 44 to the system controller 30 via the EFM / CIRC encoder / decoder 32 and used for various control operations.

During the recording operation on the mini-disc 12, an analog audio signal to be input to the audio input terminal 48 and recorded is converted into digital data by the D / A converter 46, and then input to the AIRAC encoder / decoder 38. Then, a voice compression encoding process is performed. AIR
The recording data compressed by the AC encoder / decoder 38 is temporarily written into the buffer RAM 36 by the memory controller 34, read out at a predetermined timing, and
It is input to the M-CIRC encoder / decoder 32. Then, the data is subjected to encoding processing such as CIRC encoding and EFM modulation in the EFM / CIRC encoder / decoder 32 before being sent to the magnetic head driving circuit 56.

The key operation input unit 50 includes a reproduction key, a stop key, an AMS key, a search key, and the like, and is used for user operation. The display unit 52 is configured by, for example, a liquid crystal display. The TOC memory 54 is composed of a RAM for holding the TOC information in the mini disk 12. The system controller 30 drives the spindle motor 14 and the optical head 16 at the time when the mini-disc 12 is loaded or immediately before the recording and reproducing operations, so that the TOC area of the mini-disc 12, for example, which is set on the innermost peripheral side, is The data is extracted via the RF amplifier 26 and the system controller 30 and
Store in the C memory 54. The TOC information stored in the TOC memory 54 is recorded / recorded on the mini disc 12 thereafter.
Used to control the playback operation. A portion of the TOC information that is rewritten in accordance with the recording and erasing of data on the mini-disc 12 by the user is called UTOC.

FIG. 4 is a known structural diagram of the UTOC. The main points will be described. The part table has a part table number of 01h to FFh (h means hexadecimal).
255 in total. Each part table includes a start address and an end address of a segment corresponding to the part table on the mini disk 12, mode information of the segment (for example, prohibition of overwriting and data copying, etc.), and a segment following the segment. (A link pointer = “00h” when there is no segment following the segment; “00h” means no link). What area is the segment corresponding to each part table?
FA to P-TNO255. P-DFA is a defective area on the mini-disc 12, P-EMPTY is an unused area on the mini-disc 12, and P-FRA is a mini-disc 12
Upper data unrecorded area (including erased area), P-TNO
1 to P-TNO 255 indicate tracks (songs) recorded on the mini disc 12. P-DFA, P-
EMPTY, P-FRA, P-TNO1 to P-TNO2
55 is a part table number of a head part table of one or a plurality of part tables corresponding to the corresponding segment if there is a corresponding segment;
0h "is written in each part table. If there is a link pointer in each parts table, and if there is a subsequent segment, the part table number of the next parts table is written in the link pointer and the part pointer exists. Otherwise, "00h" is written in the link pointer, so that P-DFA, P-EMPTY, P-FRA, P-
TNO1 to P-TNO255 only indicate the part table number of the leading parts table, and can detect all of the parts tables connected to it. Also,
First TNO and Last TNO indicate the first and last song numbers, respectively.

FIG. 2 shows a series of parts tables having a defective link pointer. Parts table number "2"
Although the link pointer of "Bh" should originally be "E3h", it is "18h" for some reason, and the part table whose link pointer is "18h" is replaced by the part table number "18h". 03h ”and“ 2Bh ”
And there are two. In this case, "18h", "1F
h "and" 2Bh "constitute a loop, and a track corresponding to this part table series may cause an error and may not be able to be reproduced. Set the link pointer of the parts table with the number “2Bh” to “0”.
Thus, the segment corresponding to “E3h” cannot be reproduced, but “03h” is changed to “0h”.
Reproduction of a segment corresponding to a part table up to 2Bh "is possible.

In FIG. 2, the part table number is "
2Bh ”, that is, the link pointer of the latter part table in the part table series is set to“ 00 ”.
However, even if the link pointer of the earlier part table in the parts table series is rewritten to "00h", the loop can be resolved and some segments can be reproduced.

FIG. 1 is a flowchart of the process of restoring the mini disk 12. In S60, the initial value 1 is substituted for i. In S62, a loop of the parts table series corresponding to the ith song is checked. In S62, as a result of the check in S60, it is determined whether or not there is a part table having the same part table number as the link pointer (= LINK-P), that is, whether or not there is a loop.
If S, proceed to S66; if NO, skip S66 and proceed to S68. In S66, the link pointer is rewritten to "00h" for the second part table in the part table series in the part tables having the same part table number of the link pointer. This allows
The loop is eliminated for the song. In S68, it is determined whether or not the next music piece exists.
The process proceeds to 0, and if NO, the process ends. In S70, i is incremented by 1, and the process returns to S62.

[Brief description of the drawings]

FIG. 1 is a flowchart of a minidisk restoration process.

FIG. 2 is a diagram showing a series of a part table in which a link pointer has a defect.

FIG. 3 is a block diagram of a mini-disc device for reproducing and recording on a mini-disc.

FIG. 4 is a known structural diagram of UTOC.

[Explanation of symbols]

 10 Mini disk device (disk repair device) 12 Mini disk (disk)

Claims (3)

[Claims] 1. A UTOC recorded on a disk (12)
A disk repair method in which each part table includes a start address and an end address of a predetermined segment of the disk (12), and a link pointer indicating a part table number of a part table corresponding to a segment following the segment. In the case where there are a plurality of part tables having the same part table number of the link pointer in the part table series serially linked by the link pointer, the link pointer of the first or second part table in the part table series Wherein the disk is rewritten without a link. 2. UTOC recorded on a disk (12)
Disk repair apparatus in which each part table includes a start address and an end address of a predetermined segment of the disk (12), and a link pointer indicating a part table number of a part table corresponding to a segment following the segment. In (10), (a) a link pointer reading means for reading a link pointer of each part table of a part table series serially connected by a link pointer, and (b) a link pointer by the link pointer reading means. If there are multiple parts tables with the same part table number of the link pointer in the specified parts table series,
A disk repair apparatus comprising: link pointer rewriting means for rewriting a link pointer of a first or second part table in a part table series without a link. 3. UTOC recorded on a disk (12)
Disk repair apparatus in which each part table includes a start address and an end address of a predetermined segment of the disk (12), and a link pointer indicating a part table number of a part table corresponding to a segment following the segment. In (10), (a) link pointer reading means for reading a link pointer of each part table, and (b) a part table having a link pointer of the same part table number as the already read part table number as the link pointer of the part table And a link pointer rewriting means for rewriting the link pointer of the parts table without a link when there is a disk table.