JP2539417B2 - Information recording method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an information recording method, and more particularly, to an information recording method and an information recording method effective for an optical disk control device having a replacement area for a defective recording area on a recording medium. Recording / reproducing method.

[Conventional technology]

The conventional device makes a decision to rewrite in the replacement area,
It was performed from the number of errors by the error check code (ECC). However, no consideration was given to the processing time. As a technique of this kind, Japanese Patent Laid-Open No. 59-94243 can be cited.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the ECC is used for the determination to rewrite the original information in the replacement area, and the check processing time is not taken into consideration. In the above case, it takes a long time for the defective area to be determined by the ECC correction circuit, and the defective area is determined to be one sector after the read sector.

An object of the present invention is to determine a defective writing area at the same time as a data reading operation on a medium.

[Means for solving problems]

The above object is achieved by comparing the information before writing with the reading operation.

[Action]

The check according to the present invention operates to perform a read check at the time of read, after, and write, while reading information from the optical disc, and performing a compare check with the information before writing. As a result, the check time is almost the same as the reading end time, and the check time can be shortened.

〔Example〕

FIG. 1 shows the recording format in one track. Each track is composed of m blocks S _{o to} S _m -1 corresponding to a sector, and an original sector OS and an ortho (alternating) sector AS are included in this block. Each sector is composed of an ID section and a data section. ID
The part mainly records information indicating the physical position of the sector (track number, sector number), and the data part includes the user data part and error recovery (ECC) and error check (CR).
The accompanying information such as C) is recorded.

FIG. 2 is a block diagram of an optical disk control device for controlling writing and reproduction of information in the original sector OS and the ortho sector AS described above. In FIG. 2, reference numeral 1 is an interface controller for controlling signal exchange with a host device (host interface), and 2 is operation of each component of the optical disk control device according to instructions from the host device in a predetermined procedure. A microprocessor, 3 is a memory for storing microinstructions that define the control operation by the microprocessor 2, 4 is a data buffer having a user data recording capacity of at least one track of the optical disc, and 5 is a data buffer 4 A writing circuit 6 for modulating the data taken out from the optical driving device 8 and outputting it to the optical driving device 8 is a reading circuit for demodulating the data reproduction signal 1OR from the optical driving device 8 and transferring it to the data buffer 4. Reference numeral 7 is a selector for selecting the input / output bus of the data buffer 4, which corresponds to the interface bus 20 and the processor bus 2 according to the microinstruction 23 given from the microprocessor 2.
1 and write / read circuit bus 22 are selected and connected to data buffer 4.

FIG. 3 shows a configuration example of the write circuit 5 and the read circuit 6 in FIG. The reference numeral 52 stores the bus 22 output from the data buffer 4 and adds the ECC created by the ECC generation circuit 51 after the user data as additional information for error recovery, and this is added as a 1-sector data section. Store. 53 modulates the information for one sector stored in the WR sector buffer 52 and sends it to the optical drive device 8. 61 inputs the read information 1OR sent from the light driving device 8. 62 demodulates the output signal of VFO circuit 61. 63 stores the demodulated signal for one sector. The 64 takes out the information stored in the RD sector buffer 63, performs ECC syndrome generation, and determines whether or not there is an error. 65 is an ECC syndrome generation circuit 6
If the error can be corrected by 4, correct the data,
Store in the data buffer 4. Reference numeral 11 is a circuit for comparing the information in the WR sector buffer 52 and the information in the RD sector buffer 63 according to the present invention. Next, the present invention will be specifically described.

According to the present invention, at the time of read, after, and write, the optical drive unit 8 is provided while passing the write data for one track through the write circuit 5.
Then, in the next rotation, the information is stored in the RD sector buffer 63 from the optical drive device 8 in order from the 0 sector of the track by the above method. On the other hand, WR sector buffer 52
Once again, information corresponding to the information of the read sector is stored from the data buffer 4. While being stored in the respective buffers, the information 14 and 15 to be compared with the data compare circuit 11 are taken out by the instruction signals 16 and 17 and compared. This compare is performed in 1-byte units to check the write data before modulation and the read data after demodulation. The conditions for rewriting the replacement area according to the result of the above compare check will be described with reference to FIG.

FIG. 4 shows an example of the structure of the data section of one sector. The data part is user data UD, UB _{oo to} UB _on -2 and ECC data ED, 4
One word consists of bytes, and it consists of W _{o to} W _m words. In the above configuration, ECC data ED for each word
Since it is 4 bytes, the error of up to 2 bytes can be corrected by ECC syndrome generation. In such a condition, the number of error areas EN
And the number of consecutive bytes EB is counted for each error number. When the data compare for one sector is completed, the number of error areas EN is 2 or more, or the number of error bytes.
When EB is 2 or more, a replacement process is performed in which the data stored in the WR sector buffer shown in FIG. 3 is rewritten in the replacement area. The reason why the replacement process is performed under the condition of the number of error areas EN ≧ 2 or the number of error bytes EB ≧ 2 is that if the number of error areas EN ≧ 2, each error position has a high probability of being close to each other. If the read operation is repeated, there is a possibility that the correction operation due to the generation of the ECC syndrome will make the correction impossible. Also, when the number of error bytes EB ≧ 2, similarly, since there is an error of at least 2 bytes, a 3-byte error occurs while the read operation is repeated, and there is a possibility that the correction cannot be made in the ECC syndrome generation. Therefore, the rewriting operation is performed by the replacement process.

In the above case, the number of error areas EN and the number of error bytes EB in one sector are used. However, as another count method of the number of error areas EN / error byte number EB, the code word W _o
Each error area number EN / error byte number EB for each W _m
The number of error areas per word EN ≧ 2 or the number of error bytes EB ≧ 2, and the number of error areas
When EB = 1 has 2 or more words, the replacement process is performed at each time. According to this method, even if the check range is not compared for one sector, the check is performed in units of one codeword, so that it is possible to determine the write failure more quickly.

〔The invention's effect〕

According to the present invention, the data compare can be checked while reading the information during the read operation after the write operation in the read, after, and write operations, so that the processing time can be shortened. Further, since the condition for performing the replacement process is taken into consideration in comparison with the correction capability of the ECC, there is an effect that the reliability of the conventional device can be maintained.

[Brief description of drawings]

FIG. 1 is a recording format diagram of one track of an embodiment of the present invention, FIG. 2 is a configuration diagram of an optical disk control device, FIG. 3 is a configuration diagram of a writing / reading circuit, and FIG. 4 is data of one sector. It is a block diagram. 1 ... Interface controller, 2 ... Microprocessor, 3 ... Memory, 4 ... Data buffer, 5 ... Write circuit, 6 ... Read circuit, 7 ... Selector, 8 ... Optical drive device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Izawa 3-9-11 Midoricho, Musashino City Nippon Telegraph and Telephone Corporation, Institute of Electronics and Mechanical Engineers (56) References JP-A-61-158070 (JP, A) JP-A-60-59540 (JP, A) JP-A-59-154651 (JP, A)

Claims (1)

(57) [Claims] 1. An optical drive device for recording / reproducing data, a modulation circuit for modulating write data, a demodulation circuit for demodulating read data, and data for comparing read data after demodulation and write data before modulation. An information recording system of an optical disc control device having a compare circuit, wherein write data with ECC added is modulated by the modulation circuit, recorded on the optical disc by the optical drive device, and used for the recording. Reading the recorded data by an optical driving device, demodulating the read data by a demodulation circuit,
The read data after demodulation and the write data before modulation are compared by the compare circuit to determine the recording defect, and the result of the defect determination is the write data which is equal to or more than the condition defined in the range recoverable by the ECC, An information recording system characterized by re-recording in a replacement sector on the same track as the sector in which the defective data is recorded.