JPS6396779A - Data recording system - Google Patents

Abstract

PURPOSE:To record and reproduce information with ability to correct a host of errors by recording the information on an information recording medium on a block basis and further recording information regarding the type of the ability of said information. CONSTITUTION:Information regarding a file name 21, a top track number 22, a file size 23 and so on is normally recorded in a directory 20. Here an ECC information 24 is added to the directory 20. For recording, original data of one track is converted into data with ECC in accordance with the type of ECC, and the data is recorded on the data track 10 of an optical card. After the data is recorded on the final track of a file, data converted into the directory part 20 of the optical card is recorded. For reproducing, data with ECC is converted into original data. Data on an object track is read in, and it is judged to be data with ECC. In accordance with the type of ECC, data with ECC is converted into original data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data recording system, and in particular uses an information recording medium capable of recording information having multiple types of error correction capabilities in every m blocks. Regarding data recording methods.

[Prior Art] Conventionally, information recording media include floppy disks that perform recording and reproduction using magnetism, and optical information recording media (hereinafter referred to as optical carts) that perform recording and reproduction using light.
etc. are known.

These information recording media use auxiliary data, so-called directories, for managing data file by file in order to store large amounts of data. Usually, file information such as a file name, file length, and first data track number is written in the directory to manage files in the data section.

The above-mentioned optical cards, especially non-erasable write-once optical cards, have a large storage capacity even though they are about the size of a credit card. The dimensions of the credit cart are approximately 8
The size is 5mm x 55mm, and the track pitch is currently 20.
When the recording length of ILm, 1 bit is set to 5 meters, the number of tracks 55 x (1000 ÷ 20) = 2750 (tracks) bit capacity / track 85 x (1000 ÷ 5) = 17000 (bi
t) Byte capacity/track 17000 ÷ 8 touches 2000 (hide). Therefore, the total data capacity is 2750x2000 = 5500000 = 5.5 (MB).

In order to manage such a large amount of fake information, an information management method using a directory is required.

FIG. 6 is a schematic plan view showing an example of an optical cart.

As shown in FIG. 6, the optical cart l has a data section 10 (101, 102°=, Ion) consisting of data tracks.
and the directory section 20 (201, 202,..., 2
0n) is provided, and a data section 10 is provided from the top of the optical card.
Data is written in the E direction, and directory information, which is data management information, is written in the D direction from the bottom of the optical card 1 into the directory section 20 in a write-once manner.

The data sections 101 to Ion are divided into a track information section 1 in which track numbers, ECC information, etc. are recorded, and a data recording section 12. For information recording media such as optical cards that have a high error rate of recorded data, ECC is used as an error correction method.
A method is used in which the data is converted into data with an (Error-Correction-Code) added and error correction is performed on a track-by-track basis.

There are several types of ECC, such as double correction, triple correction, triple correction, double correction,
As the number of triple corrections increases, the error correction ability increases, but the ratio of the amount of ECC data added to the -correction also increases, and the original file data amount decreases.

[Problems to be Solved by the Invention] In the above directory management method, in order to use files efficiently, it is necessary to decide whether to achieve accuracy or memory efficiency according to the required accuracy of the file to be recorded, and to It is desirable to select the type of error correction for each data.

An object of the present invention is to provide a data recording method used in an information recording medium capable of recording information having multiple types of correction capabilities.

[Means for Solving the Problems] The data recording method of the present invention records information having multiple types of error correction capabilities on an information recording medium in block units, and records information having multiple types of error correction capabilities in blocks. It is characterized by recording information regarding the type of error correction ability.

[Function] The present invention records information on an information recording medium by selecting the type of correction ability according to the reliability and necessity of the recorded data, and records the type of error correction ability. This makes it possible to record and reproduce information with error correction capability.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that in the following description, an optical card will be taken up as an example of an information recording medium.

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

FIG. 4 is a schematic diagram of an example of the configuration 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 higher-level control device (hereinafter referred to as a host) 32, and performs data communication, control, etc. between the drive 31 and the host 32. The MPU 33 in the drive 31 is ROM, RAM
The AT/AF control circuit 34 receives the signal from the photodetector 39 and drives the AF actuator 40 and AT actuator 41. Further, the modulation circuit 35 is
Recording is performed by changing the emission intensity of the light source 38 during recording, and data is demodulated based on the signal from the photodetector 39 during reproduction. The host 32 transmits and receives data to and from the drive 31, and records and reproduces information for each data track on the optical card 1. This optical card 1 has a high error rate due to the nature of the medium, and if highly reliable information is required, an error correction means is required. Further, some of the information to be recorded does not require high quality, such as image information and music information, and it is necessary to select the error correction capability according to the degree of necessity. The Reed-Solomon method will be described below as an example of an error correction method.

FIG. 5 is an explanatory diagram showing additional data for error correction using the sort-Solomon method for 2 bytes of data (D□, D2).

The range indicated by A in the figure indicates the range of triple correction, and the total number of data is generally expressed as (m+4)X (n+4), so in the example of the 5th UfjJ, m=2゜n=1. Therefore, (2+4)X (1+4)=30 (bytes).

In addition, the range indicated by B in the figure indicates the range of triple correction, and the total number of data is generally expressed as (m+8)X (n+8), so in the example of FIG.
(1+8)=90 (bytes). In this way, the total number of data differs greatly between double correction and triple correction.

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

As shown in the figure, information regarding a file name 21, a first track number 22, a file size 23, etc. is usually recorded in the directory 20. In this embodiment, ECC information 24 is added to the directory 20. This ECC information 24 indicates whether the data track of the file indicated by the directory 20 has ECC.
Information indicating the type of CC is also included.

Next, a method for recording information on the optical cart in the file management system using the above directory will be explained using a flowchart.

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

As shown in the figure, it is determined in S1 whether ECC is to be added to the file data, and if ECC is not to be added, the process goes to S3. When adding, select l according to the type of ECC in S2.
Convert the original data of 92 minutes of tiger to data with ECC,
3. Record data on the data track of the optical card.

In S4, it is determined whether all data of the file has been recorded or not, and if there is still data to be recorded, the process is repeated from St. After recording the last track of the file, go to S5 and check the ECC of directory data related to the recorded file.
At S6, the data converted at 85 is recorded in the directory section of the optical cart.

Next, a method for reproducing files recorded using the above method will be explained.

FIG. 2 is a flowchart showing a file playback method.

As shown in the figure, directory data is read from the directory section of the information recording medium at T1.

At T2, data with ECC is converted to original data.

At T3, the target data track is read using the directory information obtained at T2, and at T4 it is determined whether the data has ECC or not based on the ECC information of the directory. If there is no ECC, the process goes to T6. T5 if with ECC
The data with ECC is converted into original data according to the type of ECC based on the ECC information. At T6, it is determined whether the data track has been read to the end of the file, and if the data track has not been read yet, the process repeats from T3.

In the above embodiment, ECC information is added to the directory, but the type of ECC may be distinguished by adding ECC information to each data track information section. In this case, the error correction method for the track information section is It is an essential condition that it remains constant regardless of the error correction method of the data section.

[Effects of the Invention] As explained above in detail, according to the data recording method of the present invention, it is possible to record and reproduce information with multiple types of error correction capabilities, and to It becomes possible to select reliability and memory efficiency, and select the type of error correction.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a data recording method according to the present invention. FIG. 2 is a flowchart showing a file playback method. FIG. 3 is an explanatory diagram showing the contents of the directory. FIG. 4 is a schematic diagram of an example of the configuration of an information recording/reproducing apparatus used in the present invention. FIG. 5 is an explanatory diagram showing additional data for error correction using the Reed-Solomon method. FIG. 6 is a schematic plan view showing an example of an optical card. 31...Drive 32...Host 10...Data section 20...Directory section Agent Patent attorney Jo Taira Yamashita Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A data recording method characterized in that information having multiple types of error correction capabilities is recorded in block units on an information recording medium, and information regarding the types of error correction capabilities of the information having the error correction capabilities is recorded. .