JPH1131361A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly read out data parts by erasing at least an ID part of a faulty sector after the faulty sector is detected in formatting and shifting to format every addresses of sectors succeeding to it one by one to enable addresses of sectors to be estimated correctly even when the addresses of the sectors are not read out correctly. SOLUTION: Addresses stored in ID parts just after formatting are defined as N, N+1,.... When an ID part 8 is not read out correctly in a verification after the formatting, a sector corresponding to the data part 4 of the ID part 8 is erased to be turned to an erased part 12 and addresses of ID parts 5, 7 are repressively changed from N+2, N+3 to N+1, N+2. Consequently, since a sector readout failure never occurs in the erased part 12 when read and the address of the ID part 10 is determined as N+1 uniquely even when a device fails in reading the ID part 10, the address of the ID part 10 can be estimated correctly and a data part 6 is read out correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus, and more particularly, to an error processing at the time of reading a sector address.

[0002]

2. Description of the Related Art Various types of sector replacement methods have been devised in information recording / reproducing apparatuses. For example, as described in Japanese Patent Application Laid-Open No. Hei 3-22266, when a write error occurs, a defective sector is immediately replaced with a sector immediately after it. Replaced by
The following sectors were shifted one by one. A conventional method will be described with reference to FIG.

FIG. 3A shows the order of an ID part and a data part immediately after formatting. The addresses stored in the ID section are arranged in order of N, N + 1, N + 2, N + 3. (B) shows a state at the time of certification for verifying whether the ID part and the data part can be read correctly after formatting, and the ID part 8 is not correctly read. For this reason, when updating and reformatting the address in (c), the
FF (hex), which is a special data pattern indicating that the sector has been replaced, is written in the D section. By the sector replacement, the addresses stored in the ID portions 5 and 7 in (b) are changed from N + 2 to N + 1 and from N + 3 to N + 2 in (c). As a result, data can be transferred to the host without changing the position of the head and without changing the order of the read sectors, so that there is an advantage that the processing time can be reduced.

[0004] However, after the format processing of (a) to (c), when reading is performed in (d), the ID section 1 holding the address N and the ID section 11 holding the address N + 2, If neither of the two ID portions 9 and 10 can be read correctly, without the replacement sector list, which of the sectors formed by 9 and 4 and the sector formed by 10 and 6 is replaced, and , 9 and 10, it cannot be determined which of the ID sections holds the (N + 1) address, and an ID section reading error occurs.

[0005]

As described above, in the case where the replacement sector list is not provided, if the ID section holding the address of the sector cannot be read correctly due to the deterioration of the characteristics of the recording medium or the like, the sector which has already been replaced can be read. There was a problem that it was not possible to determine whether or not it was a read error.

[0006]

In order to solve the above-mentioned problems, an information recording / reproducing apparatus of the present invention detects at least one defective sector at the time of formatting, and then detects at least one of the defective sectors.
It is characterized in that the D section is erased, and the address of the subsequent sector is shifted one by one for formatting.

According to the present invention, even when the sector address cannot be read correctly, the sector address can be correctly estimated and the data portion can be read correctly, and a highly reliable information recording / reproducing apparatus can be provided. Can be provided.

[0008]

An information recording / reproducing apparatus according to claim 1 of the present invention divides a recording medium area into sectors, and comprises an ID section for recording an address and a data section for recording data on the recording medium. It has means for determining whether the address and data recorded in the sector have been correctly recorded in the sector, and has no sector replacement information list for replacing a sector that has not been correctly recorded with the next sector. The information recording / reproducing apparatus is characterized in that the ID section in which the sector has not been accurately recorded is erased by recording a data pattern not including an address mark. Even when the data cannot be output, it is possible to correctly estimate the address of the ID part that cannot be read from the addresses before and after that and read the data part.

(Embodiment) The first aspect of the present invention will be described below.
The embodiment of the invention described in (1) will be described with reference to FIGS.

In FIG. 1, reference numeral 11 denotes a head for taking out information recorded on a medium. At the time of data reading, a recording signal is taken out from the head, amplified and waveform-shaped by 10 R / W AMPs, separated into a clock component and a data component by a data detector 8, and decoded by a decoder 7. . In this embodiment, (1, 7) RLL code is used. The decoded data is input to the ID part error detector 5, and when the data of the ID part cannot be read correctly, the sequencer 3 is notified. As a method of checking whether or not the data can be read, a method of comparing whether the address written in the ID portion is different from the specified address and a method of checking the content of the CRC added to the content of the address are used together. You. Further, the decoded data is inspected by the ECC detector 4 for an error correction code ECC added in sector units, and it is determined whether or not an error has occurred in the data portion. In the present embodiment, the ECC detection device also serves as a detector as to whether the data portion of the sector has been correctly written after formatting. From the data, only the data portion of the sector is extracted by the sequencer 3 and passed through the buffer controller 2 to the buffer 1.
Is stored once. The data stored in buffer 1 is
Issued to host interface 12 through buffer controller.

Next, the operation at the time of writing data will be described. The data to be written is input from the host to the host interface 12 and the buffer controller 2
Is temporarily stored in the buffer 1. The data stored in the buffer 1 is sent to a sequencer 3 through a buffer controller 2, and an ECC adder 4 adds an error correction code ECC to the end of the sector. After the sector data is encoded by the encoder 6, it is converted into a bit string and sent to the write circuit 9. Said Wri
The recording signal obtained by current conversion in the te circuit
Through the media.

Next, the sector replacement method at the time of formatting and the processing effect at the time of reading according to the present invention will be described with reference to FIG.

In FIG. 2, (a) shows the order of the ID part and the data part immediately after formatting. The addresses stored in the ID section are arranged in order of N, N + 1, N + 2, N + 3. (B) shows a state at the time of certification for verifying whether the ID part and the data part can be read correctly after formatting. In this example, the ID part 8 is not correctly read. This determination is made by the detector 5 of FIG. Therefore, in (c), the address is updated and reformatting is performed. ID in (b)
The sectors corresponding to the section 8 and the data section 4 are erased in (c) to form 12 erased sections. A defective sector having no ID portion is treated the same as an inter-sector gap, and is ignored in a read operation. Therefore, the sectors are apparently arranged continuously. At the same time, the addresses stored in the ID section 5 and the ID section 7 in (b) are changed from N + 2 to N + 1 and from N + 3 to N + 2 in (c), respectively. By not including the address mark indicating the start of the ID section and the data section in the erasing section 12, failure of reading of the ID section or the data section in the erasing section during reading is prevented.

In this embodiment, the recording method is (1, 7)
When the RLL method is used and the cycle corresponding to the highest recording frequency of the recording / reproducing apparatus is 2T, the address mark uses a repetition of a 12T pattern.
If the 2T pattern is used as the data pattern for erasing the part, the erased ID part will not be erroneously read. Similar effects can be obtained by performing DC erasing (DC erasing) instead of AC erasing (AC erasing) using a 2T pattern. Note that the erasing unit 12 in FIG.
Although the data section following the section is also deleted, it goes without saying that the ID section alone may be deleted.

As described above, at the time of formatting,
By performing the sector replacement processing and the sector erasing of (a) to (c), the erasing unit 1 is read at the time of reading in (d).
No sector read failure occurs in 2 and 10
Even if the reading of the ID section fails, it is uniquely determined that the address of the ID section 10 is N + 1, so that a highly reliable information recording and reproducing apparatus can be realized. To determine the address, a method performed by an embedded program,
There is a method of counting up the address of the ID section by hardware.

[0016]

As described above, according to the present invention, even if the ID part cannot be read correctly, the address of the ID part can be correctly estimated and the data part can be read.

[Brief description of the drawings]

FIG. 1 is a block diagram of an information recording / reproducing apparatus according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams for explaining a sector replacement and read processing procedure at the time of formatting of the information recording / reproducing apparatus according to the embodiment of the present invention. FIG. 2A is a diagram showing a sector structure immediately after formatting. FIG. c) Sector structure diagram after reformatting (d) Sector structure diagram during reading

FIG. 3 is a diagram for explaining a sector replacement and read processing procedure at the time of formatting of the information recording / reproducing apparatus in the conventional embodiment. (A) Sector structure diagram immediately after formatting (b) Sector structure diagram at the time of certification (c) ) Sector structure diagram after reformatting (d) Sector structure diagram at the time of reading

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buffer 2 Buffer controller 3 Sequencer 4 ECC adder / detector 5 ID part error detector 6 Encoder 7 Decoder 8 Data detector 9 Write circuit 10 R / W AMP 11 Head 12 Host interface

Claims (1)

[Claims] 1. A recording medium area is classified into sectors, and an ID part for recording an address and a data part for recording data are provided in a sector of the recording medium, and the address and data recorded in the sector are accurately recorded. An information recording / reproducing apparatus having no sector replacement information list, which has means for judging whether or not the sector has been correctly recorded, and replaces a sector that has not been correctly recorded with the next sector. An information recording / reproducing apparatus characterized in that a part is erased by recording a data pattern not including an address mark.