JPS6134773A - Information recording system - Google Patents

Abstract

PURPOSE:To efficiently add and correct a data file by recording a directory sector changed and added to an area recording the data file and a directory table after changing, when the directory table is intstalled and a directory is necessary to be corrected. CONSTITUTION:When data are recorded, an error correcting code (ECC) to correct an error is added through an encoder circuit 5 to original data and recorded onto a disk 1 by a laser driving circuit 6 and a laser oscillator 7. Recording is executed per sector unit and one sector consists of original data of a 2K byte, an ECC code with a 288 byte and address information of the sector. When the data are reproduced, data for one sector on an optical disk 1 are sent to a decoder circuit 8 by a photodetecting element 10 and an amplifier circuit 9. After a circuit 8 corrects an error by using the ECC code, the circuit outputs necessary information of 2K byte.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is applicable to optical discs, optical tapes, etc.
The present invention relates to an external storage device that uses a storage medium that is recordable and non-rewritable, and particularly relates to a data management method for an external storage device that is suitable for later additional recording of information.

[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 files are recorded in the data recording area. In addition, a method is known in which search data corresponding to each data file is recorded in an index area. This method is characterized in that any data file can be accessed quickly and randomly using the search data in the index area.

However, if there is not a one-to-one correspondence between the negative data file to be recorded and the area for search data prepared in the index area, it is possible to divide the data recording area and index area in advance so that the entire disk area can be saved. It is difficult to make effective use of For example, if the data file size is large and the data recording area occupies a large portion, but there is a lot of data that does not require much search data, the index area will be left unused. Conversely, if there are many data files that do not occupy much of the data recording area, the index area will be filled first and the data recording area will become unavailable.

Furthermore, as a method of apparently rewriting already recorded data, as shown in Japanese Patent Laid-Open No. 56-22274, for example, data to be corrected is recorded in a recordable area that is not yet in use. A method is known in which information indicating that correction is to be performed is added to search data corresponding to data to be corrected.

However, although this prior art discloses a method for recording search data on a rewritable floppy disk, it does not provide details on a method for 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 to a data file recorded on a non-rewritable recording medium, and to efficiently convert the corrected or added data file into a non-rewritable data file. An object of the present invention is to provide a data file recording method for recording on a recording medium.

[Summary of the invention]

The present invention provides a directory table for managing a plurality of data file search directory sectors,
If it becomes necessary to modify the directory, such as adding or correcting data,
By recording the directory sector to be newly changed or added and the changed directory table, it is possible to add or correct data files.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be shown in FIG. 1 and below, and its operation will be explained. In FIG. 1, 1 is an optical disk for recording data; 2 is an actuator that can move an optical pickup in three directions for recording and reproducing data;
3 is a spindle motor for rotating the optical disc 1; The optical pickup actually consists of a laser oscillator 7 and a light receiving element 10. 11 is a mechanism control circuit, which includes a focus servo circuit 12, a tracking servo circuit 13. An actuator drive circuit 15 and a motor drive circuit 16 are controlled via a motor servo circuit 14 to maintain a normal relative positional relationship between the disk 1 and the optical pickup.

Reference numeral 4 denotes a control circuit, which controls the entire apparatus shown in FIG. Reference numeral 5 designates an enhancer circuit for an error correction code (MAA code), 6 a drive circuit for a laser oscillator, 9 an amplifier circuit, and 8 a decoder circuit for an error correction code. When recording data, for example, 288 bytes of 200 code for error correction are added to the original data of 2 bytes, and the laser drive circuit 6. The data is recorded on the disk by the laser oscillator 7. Recording is done in sector units, and one sector currently contains 2 bytes of original data, 288 bytes of EOO code,
and several bytes of information to represent the sector address. When reproducing data, the light receiving element 10. One sector worth of data on the optical disk 1 is sent by the amplifier circuit 9 to the decoder circuit 8. If an error occurs in the data, the decoder circuit 8 corrects the error using the XaO code, and then outputs the necessary 2 bytes of information.

FIG. 2 shows the arrangement of data on the optical disk. An optical disk has a plurality of concentric tracks or one spiral track, and each track is further divided into several sectors. These sectors are arranged in a fixed order, with the directory table 209 being recorded in the first sector and the first directory sector 21 being recorded in the next sector. Thereafter, the second directory sector 22 and the nth directory sector 23 are sequentially recorded. Similarly, regarding the data files managed by the directories, the first data file 24, the second data file 25, . The following data files are recorded in the order of the m-th data file 26. After that, 27 unused areas
It is.

FIG. 3 shows the configuration of one sector. The 12-byte SYh'O section 30 indicates the start of one sector, the 3-byte address section 31 indicates the position information (address) of the sector, and the 1-byte identification section 32 indicates the sector type (directory table sector). , directory sector,
Indicates the sector type (data file sector, etc.).

The second byte of data is recorded in the data section 33, and the 288-byte BOO code thereof is recorded in the EOO section 34.

FIG. 4 shows the structure of the directory table. The directory table contains the addresses of each directory sector A D(i) 40 , A D(2) 41 , . . .
・.

A D (rL) 42 is recorded in 4 bytes each, and finally 4 bytes of hexadecimal number φF IP H45 is recorded. This 4-byte φ1? 'FH43 allows the end of a directory sector to be recognized.

Figure 5 shows the configuration of the Buileff IJ. Each data file records 32 bytes of search data. The search data includes 11 bytes of FN50. which represents the name of the data file. 1 byte As2. representing the attributes of the data file. A 4-byte address 5A52° of the first sector in which the data file is recorded contains a 4-byte yL53 indicating the size of the data file. Since one sector has two bytes, one directory sector can manage 64 data files. A code φφH54 indicating the end of the search data is recorded next to the last search data.

When reading a data file, first the directory table is read, and the addresses of the directory sectors recorded there are sequentially read to search for the data file name. If the data file name can be searched, necessary data such as the start address of the data file can be found, and the target data file can be read immediately.

FIG. 6 is an example of the arrangement of data when a data file is added or corrected.

The recording procedure is as follows: (1) New data file F (771+I,) 6φ is recorded in an unused area.

■Correct the directory sector to which the data file corresponds as necessary (in the case of data file correction, change the start address SA and data file size PL of the data file to the new data file (m+1
) 60, and in the case of adding a data file, add 32 bytes of search data of the new data file F(7m+1). ) this new directory D
(yL') 61 is recorded in an unused area.

(2) Modify the directory table T(1) 20 and record the modified new directory table T(2) 62 at the address of the new directory D(W') 61 in an unused area. ■Old directory table T (1)
Dummy data is written to 20 to make that sector unreadable.

Thereafter, the new directory table T(2) 62 is used to search for data files.

FIG. 7 shows another example of data arrangement when data files are added or corrected. The recording procedure is the same as in the case of FIG. FIG. 6 shows a case where the number of directory sectors remains unchanged, and FIG. 7 shows a case where the number of directory sectors increases by one. After recording the corrected directory sector D (FL') 61 and the increased directory sector D (fL+1) 70, a new directory table T (2 )62 is recorded.

As can be seen from the examples shown in Figures 6 and 7, the number of sectors that increases each time a data file is added or corrected is only 2 to 3 sectors, excluding the data file, making effective use of the recording area of the optical disc. can do.

It is desirable that new data files, directory sectors, and directory tables be recorded in this order. This is because there may be a case where there is a defect on the disk and data cannot be recorded. New data file I
F (77L+1) is recorded and this data file is played back. At this time, if a serious error occurs due to a defect on the optical disk and cannot be decoded even with the error correction code, the data file F (
m+1). After confirming that data file F(ya+1) can be completely reproduced, the start address of data file Ir(m+1) is determined. Regarding the updated directory sector D(rL') to be recorded next, as in the case of the data file, the address of the directory sector ]) (-') is determined after confirming that it can be completely reproduced. New directory table T(2
) records to the unused area until it is confirmed that it can be completely reproduced.

Each time a data file is added or corrected, a new directory sector and directory table are recorded, making it necessary to find the latest directory table. The directory table that can be exported is the latest directory table. This process may be performed only once after the power is turned on, and the contents of the directory table may be recorded in the RAM within the main body.

When deleting a data file or changing the name of a data file, it is only necessary to record the directory sector to be changed and the directory table after the change.

Although the embodiment shown in FIG. 1 describes the case where an optical disk is used as a recording medium, the present invention can also be applied to an optical tape or the like as long as the recording medium is not rewritable.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to apparently add, correct, and delete data files even though a non-rewritable recording medium is used. Additionally, data files are easy to search because the latest directory sectors and directory tables are always completely updated. There is no limit to the number of data files, and the number of data files can be increased until the entire recording medium is used up. When adding or correcting a data file, the number of sectors increased is 2 to 2, excluding the data file.
It only requires 6 sectors and has almost no effect on the recording area of the recording medium.

There are effects such as

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2, 6, and 7 are explanatory diagrams showing data arrangement according to the present invention, and FIG. 3 shows the configuration of one sector. Configuration diagram shown, No. 4
The figure is an explanatory diagram of a directory according to the invention. DESCRIPTION OF SYMBOLS 1... Optical disk, 2... Actuator, 3... Spindle motor, 20, 62... Directory table, 21.22
,2!1,61.70...Directory sector, 24
, 25, 26.60...data file. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In a storage device using a recording medium that is not reversibly rewritable, a plurality of data files, a plurality of directory sectors that manage the plurality of data files, and a directory that records sector address information of the plurality of directory sectors. a new directory sector for recording, changing or adding a new data file in an unused area of the recording medium as necessary when adding, correcting or erasing the data file;
An information recording method characterized in that a new directory table including address information of the new directory sector is recorded in an unused area of the recording medium.