JPH06333367A - Disk type recording medium - Google Patents

Abstract

PURPOSE:To speedily record many files on a recording medium by recording information in the unit of cluster and writing TDC information of a file in a linking sector area when the file is recorded. CONSTITUTION:When the file which has data for one cluster is recorded in the data sector area DS1 in the precedent cluster, the data of the file are interleaved and recorded from a first sector 00 of the area DS1 while distributed over at least more than one sector in the linking sector area LS2 of the following cluster. Further, ineffective data, e.g. data having a value of 0 are recorded from a sector FC to a sector FE of the area LS2 as the end of the data of the recorded file. When a new file is recorded successively to the final cluster of the recorded file, the UTOC information of the new file is recorded in the final sector FF of the area LS2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped recording medium capable of recording audio data of digital signals a plurality of times.

[0002]

2. Description of the Related Art When recording audio data on a disc-shaped recording medium, a recording device such as a so-called compact disc (CD) or a so-called mini disc (MD) is used.

For example, when recording audio data on a recordable and reproducible disk-shaped recording medium used for a mini disk, a modulation system EFM for converting an 8-bit unit signal encoded as a modulation system of audio data into 14 bits.
Error correction method CIR that combines (Eight to Fourteen Modulation) with a Reed-Solomon code of an error correction code having a high random error correction ability as an error correction method and a method of converting a burst error into a random error
C (Cross Interleave Reed-solomon Code) is used. When converting a burst error into a random error in this error correction method CIRC, the audio data, which is a digital signal, is rearranged, that is, interleaved, by a predetermined method in order to improve the error correction capability. The interleaved audio data and the error correction code data are distributed and written on a plurality of sectors on the disk-shaped recording medium.

Further, the above-mentioned data are collectively written in each cluster which is a physical recording unit on the disc-shaped recording medium. The cluster is composed of a total of 36 sectors including 4 linking sector areas and 32 data sector areas. 0 in each sector of the data sector area
Identification numbers from 0 to 1F are given, and identification numbers from FC to FF are given to each sector in the linking sector area.

For example, when the audio data for one cluster is written to the disk-shaped recording medium as a sequential file, the interleaved audio data is written from the first sector of a predetermined cluster in the data sector area, and Writing is performed using up to some sectors of the linking sector area of the cluster subsequent to the predetermined cluster.

Further, at the time of writing a file, information about the file, that is, a file name, a file name length, a file attribute, a file start address and a file end address, etc. are recorded as UTOC (User Table Of Contents) information. . The UTOC information is the UTOC area located inside the program area for recording data, that is, near the center of the disk-shaped recording medium from the program area, in the recordable area that can be recorded multiple times on the disk-shaped recording medium. Written in.

When reproducing audio data from the disk-shaped recording medium in which the above data is written, the UTOC
The UTOC information of the file to be read from the area is searched, and the audio data is read from the program area according to the UTOC information.

[0008]

By the way, when recording a file on the disk-shaped recording medium as described above, after writing data in the program area, the recording head for writing data is moved to the UTOC area. It takes time to write one file because the UTOC information is written.

When writing files to the disc-shaped recording medium, the number of UTs corresponding to the number of files is increased.
Write OC information, but write the above UTOC information U
Since the TOC area is a fixed area, the number of UTOC information that can be written is limited, so that the number of files that can be written is also limited. For example, a file in an audio format is a 255 file, a three-layer error correction code ECC (3rd layer Error C
You can write up to about 200 files in the format using the orrecting code), but you cannot write more files.

In view of the above situation, the present invention provides a disc-shaped recording medium in which the number of written files is not limited.

[0011]

DISCLOSURE OF THE INVENTION A disk-shaped recording medium according to the present invention records information in cluster units, has a linking sector area at a position subsequent to an adjacent cluster in the cluster, and when recording a file. Solves the above-mentioned problem by writing the TOC information of the file in the linking sector area.

The cluster is composed of 4 linking sector areas and 32 data sector areas. One sector in the linking sector area is used for writing the TOC information, and the cluster of the last cluster of the file is used. It is characterized in that the EOF information is written in one sector of the linking sector area.

Further, the TOC information of the file is written in the first sector of the data sector area in the cluster.

At this time, the cluster is composed of four linking sector areas and 32 data sector areas, and the first sector in the data sector area is the T sector.
It is used for writing OC information, and is characterized by writing EOF information in the data sector next to the last data sector of the file.

Here, the TOC information is information relating to the recorded file such as the file name and address of the recorded file, and the EOF (End Of File).
The information is information indicating the end of the recorded file, for example, a value of 0.

[0016]

According to the present invention, a large number of files can be quickly recorded on the disc-shaped recording medium.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a disc recording / reproducing apparatus using a disc-shaped recording medium according to the present invention.

In FIG. 1, the disk-shaped recording medium according to the present invention is a magneto-optical disk 12. When writing a voice data file to the disk 12, an external file write command is input through the I / F (interface) 1, and the write command is sent to the memory manager 2 and the CPU (central processing unit) 4 Sent to.
The CPU 4 inputs the data to be written by the write command from the I / F 1, and the memory manager 2
To the buffer memory 3 via. The data in the buffer memory 3 is sent to the ECC encoder / decoder 5 to be encoded, and is modulated and error-corrected by the EFM / CIRC encoder / decoder 13.

The CPU 4 also sends a command to the servo circuit 6 to rotate the disk 12. The servo circuit 6 drives the spindle motor 8 to rotate the disk 12, and drives the feed motor 7 to move the optical pickup 9 to a predetermined position. The laser light from the optical pickup 9 is condensed and irradiated onto the disk 12 through the objective lens 10 and, at the same time, the EFM.
The recording signal from the head drive circuit 16 is sent to the recording magnetic head 11 based on the signals from the encoder / decoder 13 of CIRC.

A magnetic field corresponding to the recording signal from the head drive circuit 16 is formed near the laser spot on the disk 12 by the laser light from the optical pickup 9. Then, when the desired recording position on the disk 12 moves from the laser spot and the temperature at the desired recording position drops below the Curie temperature, the data is recorded by being magnetized in the direction of the magnetic field. .

For example, a file having data for one cluster is a data sector area D in the preceding cluster shown in FIG.
When recorded in S ₁ , the data of the file is interleaved and distributed from the first sector 00 of the data sector area DS ₁ to at least one sector or more in the linking sector area LS ₂ of the subsequent cluster, Will be recorded. Further, from the sector FC to the sector FE of the linking sector area LS ₂ , invalid data shown by the horizontal line in FIG. 2 such as data having a value of 0 is recorded as the end of the data of the recorded file,
Prevents adverse effects on data in other sectors.

Next, when a new file is recorded continuously to the last cluster of the recorded file, the last sector FF of the linking sector area LS ₂ in the succeeding cluster shown by the diagonal lines in FIG. 2, That is, the UTOC information of the new file is recorded in the sector FF which is the spare sector in the conventional technique.

The format of this UTOC information is shown in FIG. The sector FF includes a 16-byte header area HA and a 2336-byte data area DA. The header area HA has 12 bytes of synchronization signal data and a header H.
D is recorded. In the data area DA, an 8-byte subheader SHD, a 2-byte file name length LFN indicating the file name length, a 10-byte file name FN indicating the file name, and a file to be recorded are directories. Or is it a file?
Also, an 8-byte file attribute F indicating whether the content of the file is data or a program, etc.
A, a 4-byte file start address FS indicating the start sector of the recorded file and a 4-byte file end address FE indicating the end sector of the recorded file,
A 4-byte next cluster start address FWP indicating the cluster to be recorded next to the cluster recorded in association with one file, and 4 to indicate the cluster previously recorded before the recorded cluster. The previous cluster head address BWP of the byte is recorded.

For example, the next cluster start address FW
If the value of P and the value of the previous cluster start address BWP are both 0, it indicates that the recorded file is completed in the cluster. Further, after the previous cluster head address BWP, a copy protection flag indicating whether copying is prohibited, an error detection code EDC indicating whether an error has occurred, error correction codes ECCP and ECCQ.
Is recorded.

When the UTOC information of the file as described above is written in the last sector FF of the linking sector area, the last sector F of the linking sector area in the cluster in which the last data of the new file is written.
EOF information indicating the end of the file may be written in F.

As a second embodiment when a new file is recorded continuously to the last cluster of the recorded file, the data sector area DS ₂ in the succeeding cluster shown by the diagonal lines in FIG. Of the next file in the first sector 00 of the
You may make it write C information. In this case, the EOF of the file is written in the sector next to the sector of the data sector area in which the last data of the new file is written.
The information should be written.

Therefore, when continuously writing data of a plurality of files to the disk-shaped recording medium according to the present invention, after writing the data in the program area, the recording magnetic head 11 is used to write the UTOC information of the files. Files can be continuously written on the disk 12 without moving from the program area to the UTOC area.

When the audio data file is read from the disk 12, a data read command from the I / F 1 is issued to the CPU via the memory manager 2.
Sent to 4. As in the case of writing the above-mentioned data, the CPU 4 causes the servo circuit 6 to operate the disk 1
Send a command to rotate 2. The servo circuit 6 drives the spindle motor 8 to rotate the disk 12, and drives the feed motor 7 to move the optical pickup 9 to a predetermined position.

The laser light from the optical pickup 9 is condensed and irradiated onto the disk 12 through the objective lens 10, and the amount of reflected light is read. The amount of light is detected as an electric signal and is transmitted via the RF amplifier 14 to the EFM.
And the CIRC encoder / decoder 13, and the position where the read data is recorded is sent from the address decoder 15 to the EFM and CIRC encoder / decoder 13.

The above-mentioned embodiment is an example of the present invention.
For example, when the UTOC information of the file is written in the last sector FF in the linking sector area, the EOF information of the file is written in the sector next to the sector in the data sector area in which the last data is written. That is, when the UTOC information of the file is written in the first sector 00 in the data sector area, the EOF information of the file is written in the last sector FF of the linking sector area in the cluster in which the last data is written. It is also possible to In addition, it goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0031]

As is apparent from the above description, in the disc-shaped recording medium according to the present invention, information is recorded in cluster units, and a linking sector area is provided in the cluster at a position following an adjacent cluster. When recording a file, the TO of the file is written in the linking sector area.
By writing the C information or writing the TOC information of the file in the first sector of the data sector area in the cluster, the number of files of the recorded file is not limited.

Further, when a plurality of files are continuously written, the recording head can be moved to a position where data is recorded before writing and the file can be waited.
Files can be rapidly and continuously written without moving a recording head or the like to the UTOC area to write OC information.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic recording / reproducing apparatus using a disc-shaped recording medium according to the present invention.

FIG. 2 is a diagram showing a format of a disc-shaped recording medium according to the present invention.

FIG. 3 is a diagram showing a format of UTOC information written in a linking sector area of a disc-shaped recording medium according to the present invention.

FIG. 4 is a diagram showing a second format of a disc-shaped recording medium according to the present invention.

[Explanation of symbols]

1 ・ ・ ・ ・ ・ ・ ・ ・ I / F section 2 ・ ・ ・ ・ ・ ・ ・ ・ Memory manager 3 ・ ・ ・ ・ ・ ・ ・ ・ Buffer memory 4 ... CPU 5 ... ECC encoder / decoder 6 ... Servo circuit 7 Feed motor 8 Spindle motor 9 Optical pickup 10・ ・ ・ ・ ・ ・ ・ ・ Objective lens 11 ・ ・ ・ ・ ・ ・ ・ ・ Recording magnetic head 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Disk 13 ・ ・ ・・ ・ ・ EFM and CIRC encoder / decoder 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ RF amplifier 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Address decoder 16 ・ ・ ・ ・ ・... head drive circuit

Claims (6)

[Claims] 1. A disc-shaped recording medium for recording information in cluster units, wherein a linking sector area is provided in a position following an adjacent cluster in the cluster, and the file is recorded in the linking sector area when recording a file. A disk-shaped recording medium, characterized in that the TOC information of the above is written. 2. The cluster comprises four linking sector areas and 32 data sector areas, and one sector in the linking sector area is used for writing the TOC information. Item 2. The disk-shaped recording medium according to item 1. 3. The disk-shaped recording medium according to claim 1, wherein the EOF information is written in one sector of the linking sector area of the last cluster of the file. 4. A disc-shaped recording medium for recording information in cluster units, wherein TOC information of a file is written in a head sector of a data sector area in the cluster. 5. The cluster comprises four linking sector areas and 32 data sector areas, and the first sector in the data sector area is used for writing the TOC information. The disc-shaped recording medium according to claim 4. 6. The disk-shaped recording medium according to claim 4, wherein the EOF information is written in the data sector next to the last data sector of the file.