JP2623238B2 - Information playback method - Google Patents

Description

The present invention relates to an information reproducing method.

[Prior Art] FIG. 3 shows a conventional information reproducing apparatus, in particular, a control device (hereinafter, referred to as “controller”) in an optical disk device.
FIG.

This controller communicates with the host 27,
The optical disk drive 13 is connected.

 FIG. 4 is a general explanatory diagram of an optical disk.

This optical disc has sectors S0, S1 to Sn, and header sections h0, h1 to h in which address information and the like of these sectors are recorded.
n and data sections d0 and d1 to dn for recording data.

FIG. 5 is a diagram showing a general memory configuration of an optical disk.

In this memory configuration, a protection area 30, a normal sector area 31, a replacement sector area 32, a management table 33, and a protection area 34 are shown.

The management table 33 is an area for recording management information such as defective sector information and replacement sector information of the optical disk. The management information recorded in the management table 33 is reproduced when an optical disk is set in the drive device 13, and the reproduced data is stored in the memory 10.

FIG. 6 is a block diagram showing a drive device in the conventional information reproducing apparatus.

 Next, the operation of the above embodiment will be described.

FIG. 7 is a flowchart showing the operation of the above conventional example.

First, when the CPU 11 receives a data reproduction command, a reproduction data start address, and a reproduction data amount from the host 27 via the host interface 1 (S20), the CP
U11 checks whether or not there is a defective sector in the data area to be reproduced based on the management information stored in the memory 10 (S21). When there is a defective sector in the area to be reproduced (S22), the CPU 11 holds the defective sector information (S23).

After holding the address of the defective sector, the CPU 11
It instructs the drive device 13 to move the optical head 41, read the sector address, and the like (S24). The sector address is reproduced and determined by the address reproducing circuit 8 and the sector recording / reading determining circuit 9 (S25). If the reproduced address corresponds to a desired sector (S26), the data recorded in that sector is reproduced.

If the reproduced data has a defect, that is, if the data is reproduced from a defective sector (S27), a replacement sector is searched based on the held defective sector information (S30, S31). The data is reproduced from the replaced spare sector (S28, S29).

FIG. 5 shows a data area A to be reproduced, a defective sector B, and a replacement sector C corresponding to the defective sector B.
Are shown. In order to reproduce the data recorded in the replacement sector C during the series of reproduction, the optical head 41 accesses the replacement sector C from the defective sector B, and after reproducing the data in the replacement sector C, It is necessary to move the head 41 to the data area A again to continue the data reproduction.

Therefore, in the above conventional example, every time the optical head 41 accesses the defective sector B during a series of data reproduction,
Since the optical head 41 needs to be accessed to the replacement sector C and the optical head 41 needs to be restored, if the plurality of defective sectors B exist in the reproduction data area A, the replacement sector C must be accessed a plurality of times. However, there is a problem that the data reproduction rate is reduced.

[Object of the Invention] The present invention provides an information recording medium which is divided into a plurality of sectors,
The information recording medium has a replacement sector in which information is recorded instead of the defective sector, reads information from the information recording medium according to information indicating a reproduction area specified by the computer, and transfers the read information to the computer. An information reproducing method capable of reducing the capacity of a buffer for storing information recorded in a replacement sector corresponding to a defective sector and reading and transferring the information efficiently. It is intended to do so.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, the same members as those of the conventional device shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. The optical disk shown in FIG. 4, the disk memory configuration shown in FIG. 5, and the drive device shown in FIG. 6 are common to the above embodiments.

In FIG. 1, a track buffer 82, an ECC encoder 83, a digital modulation circuit 84, a digital demodulation circuit 87
, An ECC decoder 88, a replacement sector buffer 89, a sector recording / reading determination circuit 90, an address reproduction circuit 91, a memory 92, a CPU 93, and a hardware error detection circuit 94.

The replacement sector buffer 89 stores information recorded in the replacement sector area 32 (that is, the replacement sector B) shown in FIG.

When the defective sector B exists on the optical disk 48, the information is reproduced from the replacement sector C corresponding to the defective sector B before reproducing the information from the optical disk,
The reproduced information is stored in the replacement sector buffer 89. Further, when the optical head 41 accesses the defective sector B during reproduction of the optical disk 48, the information corresponding to the replacement sector C is read from the replacement sector buffer 89 without accessing the replacement sector C. It was made.

 Next, the operation of the above embodiment will be described.

FIG. 2 is a flowchart showing the operation of the above embodiment.

First, when the optical disk 48 is loaded, the CPU 93 instructs the replacement memory management information recorded in the management table 43 on the optical disk 48 to be stored in the memory 92. The replacement sector management information is stored in the memory 92 via the optical head 41, the head amplifier 45, the waveform shaping circuit 46, the drive interfaces 5, 85, the digital demodulation circuit 87, the ECC decoder 88, and the track buffer 82.

When reproducing the data area recorded in the normal sector area 31 of the optical disk 48, first, information about the start address and the data amount of the data area to be reproduced is sent from the host 27 via the host interface 1 (S1). .

Based on the information sent from the host 27 and the replacement sector management information stored in the memory 92, the CPU 93 checks whether a defective sector B exists in the data area A shown in FIG. 5 (S2). ). If there is no defective sector B in the data area A (S3), the CPU 93 immediately instructs data reproduction from the data area A.

If a defective sector B exists in the data area A, the CP
U93 picks up the sector numbers of all the defective sectors B in the data area A, holds the sector numbers (S4), and accesses the replacement sector area 32 by using the optical head 41 (S5). The data recorded in the corresponding replacement sector C is reproduced, and the data is stored in the replacement sector buffer memory 89 (S6, S7).

The data of the replacement sector corresponding to all the defective sectors B existing in the data area A is stored in the replacement sector buffer memory.
After storing the data in the data area 89 (S8), the CPU 93 accesses the optical head 41 to the data reproduction start address in the data area A and starts data reproduction (S9, S10, S11).

During the data reproduction, when the optical head 41 comes over the defective sector B (S12), the data stored in the replacement sector buffer memory 9 and the data reproduced from the replacement sector C corresponding to the defective sector B. The track buffer
Transfer to 82 (S14). On the other hand, when a portion other than the defective sector is being reproduced, the reproduced data is stored in the track buffer as it is (S13). In this way, the data is reproduced up to the last sector (S15).

Therefore, in the above embodiment, when the optical head 41 accesses the defective sector B during the reproduction of the data area A, the optical head 41 does not need to access the replacement sector area 32, and the replacement sector buffer memory 89 Since the stored data is transferred to the track buffer, high-speed processing can be performed. For this reason, even if there are a plurality of defective sectors, the transfer rate of the reproduced data does not decrease.

That is, when a defective sector is accessed during data reproduction, the optical head 41 does not need to access the replacement sector area 32, so that the data transfer time can be reduced.

In the above embodiment, the optical disk drive device has been described as an example. In addition, the above embodiment is applied to other drive devices such as a magnetic disk drive device, a magneto-optical disk drive device, and an optical card drive device. be able to.

According to the present invention, when reading and transferring information in a reproduction area including a defective sector, the capacity of a buffer for storing information recorded in a replacement sector corresponding to the defective sector can be reduced. In addition, there is an effect that reading and transfer can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart showing the operation in the above embodiment. FIG. 3 is a block diagram showing a control device in a conventional information reproducing device. FIG. 4 is a general explanatory diagram of the optical disc in the conventional example and the above embodiment. FIG. 5 is a diagram showing a configuration of an optical disk memory in the conventional example and the above embodiment. FIG. 6 is a diagram showing a drive device of the optical disk device in the conventional example and the above embodiment. FIG. 7 is a flow chart showing the operation of the above conventional device. A: data area, B: defective sector, C: replacement sector, 89: replacement sector buffer, 93: CPU.

Claims (2)

(57) [Claims] An information recording medium is divided into a plurality of sectors,
The information recording medium has a replacement sector in which information is recorded in place of the defective sector among the sectors, and reads information from the information recording medium in accordance with information indicating a reproduction area designated by a computer. In the information reproducing method in the information reproducing apparatus for transferring the obtained information to the computer, it is determined whether there is a defective sector in the designated reproducing area based on the replacement area management information recorded on the information recording medium. Determining a defective sector; if there is the defective sector, before accessing the designated reproduction area in the information recording medium, the defective sector included in the designated reproduction area is accessed. The information is read by accessing the corresponding spare sector and reading the information read from the spare sector. A first buffer storing step of storing the data in the provided buffer; after storing the data in the buffer, even if the reproduction area is accessed and the defective sector is accessed, the spare sector is not accessed and the normal sector is not accessed. Storing the information in the buffer while reading the information. 2. The buffer according to claim 1, wherein the buffer stores a first buffer area for storing information read from the replacement sector and information read from the designated reproduction area. A second buffer area for accessing the reproduction area, reading the information and storing the information in the second buffer area, and accessing the reproduction area to read the information. Reading the information stored in the first buffer area corresponding to the accessed defective sector without accessing the replacement sector, and reading the information read from the first buffer area into the second buffer area. An information reproducing method, wherein the information is stored in a buffer area.