JP2550009B2 - Information recording method and device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an external recording device using a recording medium such as a disc or an optical tape that can be reproduced and recorded only once, and cannot be rewritten. The present invention relates to an information recording method of a recording device and a device thereof suitable for additional recording later.

[Background of the Invention]

As a method of recording information using a non-rewritable optical disc, as shown in Japanese Patent Laid-Open No. 56-25278, the disc is divided into an index area and a data recording area, and data is recorded in the data recording area. At the same time, a method of recording search data corresponding to each data in the index area is known. This method has an advantage that any data can be accessed at high speed and randomly using the search data in the index area.

However, if the amount of data to be recorded and the area for search data prepared in the index area do not correspond one-to-one, dividing the data recording area and index area in advance will make the entire area of the disc effective. It is difficult to use. For example, the amount of data is large,
The data recording area occupies a large portion, but if there is a large amount of data that does not require much search data, the index area is left unused. On the contrary, when there is a lot of data that does not occupy the data recording area, the index area is filled first and the data recording area cannot be used.

Further, as a method of apparently rewriting already recorded data, for example, as shown in JP-A-56-22274, the data to be corrected is recorded in a recordable area which has not been used yet. There is known a method of adding information indicating that correction is performed to search data corresponding to the data to be corrected.

However, although this prior art discloses a method of recording search data on a rewritable floppy disk, it does not describe details of a method of recording search data on a non-rewritable optical disk.

[Object of the Invention] An object of the present invention is to apparently correct and add data recorded on a non-rewritable recording medium, and to read these corrected or added data at high speed. A data recording method and an apparatus therefor are provided.

[Outline of Invention]

A feature of the present invention is that a directory portion for data retrieval is provided, which enables high-speed access of data, and records data when it is necessary to correct the directory portion such as correction or addition of data. The directory part can be updated one after another by newly recording the directory part in the area to be recorded and recording the address of the new directory part in the recording unit (usually a sector) next to the old directory part.

Example of Invention

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 is an optical disk for recording data, 2 is an actuator capable of moving an optical pickup for recording and reproducing data in three directions, and 3 is a spindle motor for rotating the disk 1. . The optical pickup is actually a laser oscillator 7.
And a light receiving element 10. Reference numeral 11 denotes a mechanism control circuit, which controls the actuator drive circuit 15 and the motor drive circuit 16 via the focus servo circuit 12, the tracking servo circuit 13, and the motor servo circuit 14 so that the disc 1 and the optical pickup are in a normal relative position. It is controlled to maintain the positional relationship.

Reference numeral 4 is a control circuit, which controls the entire apparatus shown in FIG. Reference numeral 5 is an error correction code (ECC code) encoder circuit, 6 is a laser oscillator drive circuit, 9 is an amplifier circuit, and 8 is an error correction code decoder circuit. When recording data, for example, 288 bytes of ECC code for error correction is added to the original data of 2 Kbytes, and the data is recorded on the disc by the laser drive circuit 6 and the laser oscillator 7. Recording is performed on a sector-by-sector basis. In this case, one sector consists of 2 Kbytes of original data, 288 bytes of ECC code, and several bytes of information for indicating the sector address. When reproducing data, the light receiving element 10 and the amplifier circuit 9 send data for one sector on the disk to the decoder circuit 8. If an error occurs in the data, the decoder circuit corrects the error using the ECC code,
Output the required 2K bytes of information.

FIG. 2 shows the arrangement of data on the disc. On the disk, there are a plurality of concentric tracks or one spiral track, and each track is divided into several sectors. These sectors can be further arranged in a fixed order. The directory section is recorded in the first sector. The structure of the directory section is shown in FIG. At the beginning of the directory, a unique code ID 30 indicating a directory is recorded in 8 bytes, and FN31 indicating the number of files stored in the disc is also recorded in 8 bios. From the 33rd byte, 32 bytes of search data are recorded for each file. The search data consists of an 11-byte FN-132 representing the file name, a 1-byte A33 representing the file attribute, the address SA34 of the first block in which the file is recorded, and a FL35 representing the file size. 4 bytes are stored. As a block, a sector is used as it is or an integral multiple of the sector is used as one block. The size of the directory part is not limited, and may be spread over a plurality of blocks depending on the size of the file. 36 is a code indicating the end of the file, and φφ is recorded.

The next one block 21 of the directory section 20 is left unused and files are sequentially recorded from the next block. In the example of FIG. 2, from F (1) to F (n), n
There are 22 to 26 files recorded. 27 is an unused area. When reading a file, first, the directory portion is read, the directory is searched by the file name, necessary data such as the start address of the data is obtained, and the target data file can be immediately read.

When correcting data or adding files,
First, as shown in FIG. 4, a new data file AF (1) 40 is recorded in an unused area. Next, change the directory part
Modify as necessary (in the case of data correction, change the file start address SA and file size FL to those of the new file AF (1), and in the case of data addition, the number of files. Is incremented by one and new file data is added to the directory by 32 bytes.) This new directory D (1) 41 is recorded in an unused area. Furthermore, the next unused block in the old directory D (0)
At 21, the address of the new directory portion D (1) is recorded. After that, the data is accessed using the new directory portion D (1).

When data is changed again, new data is recorded in the same manner, the updated new directory portion is recorded, and the address of the new directory portion is recorded in the block next to the old directory portion. A new directory is created each time data is updated, so it is desirable to update the data collectively. FIG. 5 shows such an example. Four files AF (2) to AF (5) are additionally recorded in the example of FIG. 4, and at this time, a new directory portion D (2) and data PD (indicating the address of D (2) are recorded. 2) is recorded. PD (2) is recorded in the block next to the old directory part D (1).

New data, directory sections, and new directory addresses are preferably recorded in this order. This is because there are cases where data cannot be recorded due to defects on the disc. As shown in FIG. 6, a new data AF (m) 52 is recorded and this data is reproduced. At this time, if a serious error occurs due to a defect on the disc and the error correction code cannot be used for decoding, the data AF (m) '53 is recorded again.
When the data AF (m) 'can be reproduced, the directory D (n + 1) 54 updated for the first time is recorded, and the address of AF (m)' is used as the address of the new file. In this way, the file AF that could not be played back
(M) is automatically excluded from the file. Also in the case of recording the directory part, reading is also performed after recording, and if a serious error occurs, the directory part is recorded again. As shown in FIG. 7, if the new directory portion D (n + 1) 61 cannot be reproduced, D (n +)
1) '62 is recorded, and after confirming that D (n + 1) 'can be reproduced, the address of D (n + 1)' is changed to PD (n +
1) Record at 51. Although the substitution block is not prepared in PD (n + 1), only the address of D (n + 1) needs to be recorded in PD (n + 1), so the address is repeatedly recorded in multiplex. Then, even if a serious error that cannot be corrected by the error correction code occurs, the place where the error has occurred can be detected. Therefore, the correct address of the directory part D (n + 1) should be read from the place where no error has occurred. You can

Since a new directory section is recorded each time data is corrected, it is necessary to find the latest directory section, which is the first directory section D.
The latest directory part can be detected by sequentially tracing the addresses from PD (1) of the block next to (0). In the latest directory section, the next block is in an unused state, and in the other directory sections, the address of the next directory section is recorded. Also, the latest directory part is detected only once after the power is turned on, and after that the address is stored in the internal RAM.
Since it is sufficient to record it in, the time required for data access will not increase.

When deleting data or changing the name of data, it is possible to perform the same correction and addition of data by updating only the directory portion.

Although the embodiment of FIG. 1 describes the case where an optical disk is used as a recording medium, any recording medium that cannot be rewritten can be used in exactly the same manner. For example, the present invention is also applied to an optical tape or the like. It is possible to

〔The invention's effect〕

As described above, according to the present invention, it is possible to apparently correct, add, and delete data, even though a non-rewritable recording medium is used. Further, since the latest directory section is always updated in a complete form, the time required to access the data does not increase. Further, it is possible to increase the amount of data by effectively using the area of the recording medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
FIG. 4, FIG. 5, FIG. 5, FIG. 6, and FIG. 7 are explanatory views showing the arrangement of data according to the present invention, and FIG. 3 is an explanatory view of the directory section according to the present invention. 1 ... Optical disc, 2 ... Actuator, 3 ... Spindle motor.

Claims (2)

(57) [Claims] 1. An information recording method using a non-rewritable recording medium, wherein one or more data and a directory portion containing at least address information of the data are recorded on the recording medium. In the case where the data is updated or added, the recording of the updated or added data and the updated directory part that updates the directory part corresponding to the updated or added data such that the respective recording areas are adjacent to each other. An information recording method comprising: recording in an unused area of a medium; and recording information indicating an address of the updated directory section in an unused area of the recording medium adjacent to the directory section before updating. 2. An information recording device using a non-rewritable recording medium, comprising: a rotation driving means for rotationally driving the recording medium; and an optical pickup for irradiating the recording medium with a light beam to record and reproduce data. A focus control means for performing focus control of the optical pickup, a tracking control means for performing tracking control of the optical pickup, a rotation drive means for controlling the rotation drive means, and an encoder for adding an error correction code to recorded data Means, a laser driving means for driving the laser oscillation means of the optical pickup, a decoder means for reading the reflected light from the recording medium by the light receiving means of the optical pickup, and performing an error correction process on the read data, one or more: The data and the directory section containing at least the address information of the data are recorded. If on the recording medium that is, to update or add the data,
The update or additional data and the update directory part that updates the directory part corresponding to the update or additional data are recorded in an unused area of the recording medium so that the respective recording areas are adjacent to each other, and the update directory An information recording apparatus, comprising: a control unit configured to control so as to record information indicating a copy address in an unused area of the recording medium adjacent to the directory section before updating.