JPH0775109B2 - Data recording method - Google Patents

Description

The present invention relates to a data recording method, and more particularly to an information recording medium having a data recording section and a directory recording section, in which a plurality of data files are stored in the data recording section. The present invention relates to a data recording method of recording a directory corresponding to each data file in the directory recording unit in order to record and manage the recorded data file.

[Prior Art] Conventionally, as an information recording medium, a floppy disk for recording / reproducing by using magnetism, an optical information recording medium for recording / reproducing by using light (hereinafter referred to as an optical card)
Etc. are known.

These information recording media use auxiliary data, so-called directories, which are managed for each data file in order to store a large amount of data. Normally, file information such as a file name, file length, head data track number, etc. is written in the directory to manage the data track file.

The above-mentioned optical card, especially the non-erasable write-once type optical card, has a large recording capacity even if it is about the size of a credit card. The size of a credit card is about 85
mm × 55 mm, when the information track pitch is 20 μm and the 1-bit recording length is 5 μm, the number of tracks is 55 × (1000/20) = 2750 (lines) Bit capacity / track 85 × (1000/5) = 17000 (bit) byte capacity / track 17000/8 ≈ 2000 (bytes). Therefore, the total data capacity is 2750 x 2000 = 5500000 = 5.5 (MB).

In order to manage such a large amount of data, it is necessary to use a directory information management method.

FIG. 5 is a schematic plan view showing an example of an optical card.

As shown in FIG. 5, the optical card 1 has a data section 10 (101, 102, ..., 10n) consisting of data tracks and a directory section.
20 (201, 202, ..., 20n) are provided, and data is written from the upper part of the optical card to the data section 10 in the E direction.
The directory information, which is the data management information, is written in the directory portion 20 from the lower part of the in the direction of D by a write-once method.

Each of the data sections 101 to 10n is divided into a track information section 11 in which track numbers, ECC information, etc. are recorded, and a data recording section 12. That is, for information recording media such as optical cards, which have a high error rate of recorded data, ECC (E
rror Correction-Code) is added to the converted data,
A method of performing error correction for each track unit is used. Although this ECC has a very high error correction capability, it consumes a considerable part of the data part. Therefore, data that does not require high quality data such as image information and music information is recorded as raw data on the information recording medium without adding ECC.

Since the data processing method is different between the data part with ECC added and the data part without raw data added during recording and reproduction, it is necessary to provide information for distinguishing between a data part with ECC and a data part without ECC. This track information section 11 has this EC
Information indicating the presence or absence of C is recorded, and will be recorded in the data section 10 together with the data recording section 12 as described above.

[Problems to be Solved by the Invention] As described above, when files are managed using directories, it may be necessary to record a file that handles data without ECC. However, in the conventional data recording method, the information on the presence or absence of ECC is recorded for each data track, and even if file management is performed using a directory, the data track must be read to check the presence or absence of ECC. It had a problem that it did not become.

An object of the present invention is to provide a data recording method which is preferably used when file management is performed using a directory and file data has an error correction capability.

[Means for Solving the Problems] The above problems are caused by using an information recording medium having a data recording section and a directory recording section, recording a plurality of data files in the data recording section, and recording the recorded data. A data recording method for recording a directory having information such as a file name, an address number, and a file size in the directory recording unit for managing files of files, wherein the data recording unit has an error correction code for each data file. Either data or data having no error correction code is recorded, and information indicating the presence or absence of an error correction code for each data file is recorded in a part of the directory corresponding to each data file. And a data recording method of the present invention.

[Operation] According to the present invention, by recording in the directory recording section information relating to error correction of information recorded in the data recording section,
The error correction of the file is managed by reproducing the directory recording section without reproducing the data recording section.

EXAMPLES Examples of the present invention will be described below in detail with reference to the drawings.
In the following description, an optical card will be taken as an example of the information recording medium.

First, a configuration example of the information recording / reproducing apparatus used in the data recording method of the present invention will be described.

FIG. 4 is a schematic view of a configuration example of an information recording / reproducing apparatus used in the present invention.

An information recording / reproducing device (hereinafter referred to as a drive) 31 is connected to a host control device (hereinafter referred to as a host) 32, and performs data communication, control, etc. between the drive 31 and the host 32. The MPU33 in the drive 31 has built-in ROM and RAM.
The card feed motor 37 and the head feed motor 36 are mainly controlled, and the AT / AF control circuit 34 receives a signal from the photodetector 39 and drives the AF actuator 40 and the AT actuator 41. Further, the modulation / demodulation circuit 35 executes recording by changing the emission intensity of the light source 38 during recording, and demodulates data based on the signal of the photodetector 39 during reproduction. Host 32 is a drive
Data is transmitted / received to / from the optical disc 31 and information is recorded / reproduced on the optical card 1 for each data track. The optical card 1 has a high error rate due to the nature of the medium, and an error correction means is required when highly reliable information is required.

FIG. 3 is an explanatory diagram showing the contents of the directory 20.

As shown in the figure, the file name is normally stored in the directory 20.
21, information about the head track number 22, the file size 23, etc. is recorded. In the present invention, the directory 20
ECC information 24 is added to. This ECC information 24 is in the directory 20
Indicates the presence or absence of ECC in the data track of the file indicated by, and only 1-bit data need be added.

Next, a method of recording information on the optical card in the file management system using the above directory will be described using a flowchart.

FIG. 1 is a flow chart showing a data recording method according to the present invention.

As shown in the figure, it is determined in S1 whether ECC is added to the file data, and if not, the process proceeds to S3. When adding, the raw data for one track is converted into data with ECC in S2, and the data is recorded in the data track of the optical card in S3.

In S4, it is judged whether or not all the data of the file has been recorded, and if there is data to be recorded, the above operation is repeated from S1. After the last data track of the file is recorded, the process goes to S5, the directory data relating to the recorded file is converted into data with ECC, and the data converted in S5 is recorded in the directory part of the optical card in S6.

Next, a method of reproducing the file recorded by the above method will be described.

FIG. 2 is a flow chart showing a file reproducing method.

As shown in the figure, the directory data is read from the directory section of the optical card at T1, and the data with ECC is converted to raw data at T2.

At T3, the target data track is read according to the directory information obtained at T2, and at T4, it is determined whether the data has ECC with the ECC information of the directory. If there is no ECC, the process goes to T6. If ECC is added, the data with ECC is converted to raw data at T5. At T6, it is determined whether the data track has been read to the end of the file, and if not completed, the above operation is repeated from T3.

[Effects of the Invention] As described in detail above, according to the data recording method of the present invention, it is possible to manage the error correction of a file with a small number of data bits by recording the information regarding the error correction of the file in the directory. In addition, it is not necessary to record information relating to error correction in the data section, and as a result, it is not necessary to judge the presence or absence of error correction capability for each data track at the time of reproduction, so the reproduction time can be shortened. .

[Brief description of drawings]

FIG. 1 is a flow chart showing a data recording method according to the present invention. FIG. 2 is a flow chart showing a file reproducing method. FIG. 3 is an explanatory diagram showing the contents of the directory 20. FIG. 4 is a schematic view of a configuration example of an information recording / reproducing apparatus used in the present invention. FIG. 5 is a schematic plan view showing an example of an optical card. 31 …… Drive 32 …… Host 101 to 10n …… Data section 20 …… Directory section

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 20/18 574 A 9074-5D

Claims (1)

[Claims] 1. An information recording medium having a data recording section and a directory recording section is used, a plurality of data files are recorded in the data recording section, and a file name for recording the recorded data files is managed. In a data recording method of recording a directory having information such as an address number and a file size in the directory recording unit, in the data recording unit, data having an error correction code for each data file and data having no error correction code are recorded. A data recording method, characterized in that any one of them is recorded, and information indicating the presence or absence of an error correction code for each data file is recorded in a part of the directory corresponding to each of the data files.