JPH03222154A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To effectively reduce the storage capacity by instructing an alternate address in place of a fault sector with distinguishing information and a relative number when the sector is generated on its recording medium. CONSTITUTION:When the fault sector is detected, the residual number of alternate sectors in the same block as the fault sector is checked by a control part 5. When an alternate sector remains in the same block, the relative number of an alternate area 11 in a zone in the same block as the fault sector is calculated. That is, the relative number indicating what ordinal number of the objective alternate sector from the 1st alternate sector is obtained, and an obtained result is registered in a map of the magneto-optical disk 3. Since the alternate sector is used in the same block, a flag is '0', and an address of the fault sector is registered as the address of the original sector before alternation. On the other hand, when no alternate sectors remain, the residual number of alternate sectors in a spare area 9 is checked. If any sector remains, its relative number that is what ordinal number from the 1st alternate sector is obtained, and the obtained result is registered in the map of the magneto-optical disk 3.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an information recording and reproducing apparatus that records and reproduces information using a recording medium such as a magneto-optical disk, and more particularly to a sector management apparatus that performs sector replacement processing. [Prior Art] Conventionally, in this type of device, when a defect occurs in a sector,
A replacement process is performed in which information about a defective sector is transferred to a previously prepared alternative sector. During this replacement process, the address before replacement, that is, the replacement source address that is the address of the defective sector, and the address after replacement, that is, the replacement address that is the address of the replacement sector, are registered in the recording medium as replacement management information. . Therefore, when accessing a certain sector, it is checked in advance whether the sector has been replaced based on replacement management information, and if it has been replaced, the replacement destination address is accessed. [Problem to be solved by the invention] However, in such a device, as the number of defective sectors increases, the number of replacement management information also increases, and the limited memory recording area is used up. In a mass storage device using a disk, the amount of information required to specify a specific address is 3 bytes, and the amount of information required per sector is 6 bytes in total for the replacement source address and replacement address. Therefore, if the amount of replacement management information increases, a situation may occur where it cannot be recorded in the memory, so it has been desired that the amount of replacement management information be as small as possible. The present invention was made with attention to such circumstances, and
The purpose is to provide an information recording and reproducing device that can record sector replacement management information with a small storage capacity. [Means for solving the problem] In order to achieve the above object, the recording area of the recording medium is divided into a plurality of blocks and a spare area for preliminary recording, and
In the information recording and reproducing apparatus, an alternative area is provided for each block, and when a defective sector occurs in the recording medium, replacement processing is performed with an alternative sector in the same block as the defective sector or with an alternative sector in the spare area, The method includes means for registering discrimination information for distinguishing whether a defective sector is replaced with a replacement sector in the same block or a replacement sector in the spare area, and a relative number given to each of the blocks and the spare area. However, there is provided an information recording and reproducing apparatus characterized in that a replacement destination of a defective sector is indicated using the discrimination information and relative number.

[Effect]

In the present invention, as sector replacement management information, a relative number is assigned to each block's replacement area and spare area instead of the replacement address, and these numbers are used to indicate the replacement address. This relative number may be determined, for example, based on the start address of the alternative area, and a number may be given to each sector based on the position of each alternative sector. Further, the discrimination information indicates whether the replacement destination of a defective sector is an alternative area within the same block or an alternative sector within a spare area. The discrimination information may be, for example, a 1-bit flag "1" or "O". Therefore, the replacement destination address can be recorded with a small storage capacity, so it is possible to limit the storage capacity of replacement management information accordingly. . [Examples] Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the information recording/reproducing apparatus of the present invention. In FIG. 1, an information recording/reproducing device 1 is a device that receives commands and various data transmitted from a host computer 2, and records or reproduces information according to the instructions. The information recording and reproducing apparatus 1 includes a magneto-optical disk 3 as a recording medium, and information is recorded and reproduced optically. Also, an interface section 4 that exchanges data with the host computer 2, and a control section 5 that controls each section of the device.
, a memory 6 for temporarily storing data sent from the host computer 2. Further, an R/W section 7 records information on the magneto-optical disk 3 or reproduces information recorded on the magneto-optical disk 3 according to instructions from the control section 5.
It is equipped with In addition to normal control operations, the control unit 5 controls replacement processing when a defective sector occurs, and as described later,
Controls replacement management information recording during replacement processing. As shown in FIG. 2, the magneto-optical disk 3 has a recording area divided into a plurality of blocks 8 and a spare area 9 for preliminary recording, and is managed in units of blocks. Each block 8 is composed of a user area 10 in which various information is written and an in-zone alternative area 11 used as an alternative sector. Furthermore, the spare area 9 is also used as an alternative sector. When a defective sector occurs, a substitute sector in the intra-zone substitute area 11 in the same block as the defective sector is first used, and when this is used up, a substitute sector in the spare area 9 is used. Therefore, the replacement destination for the defective sector is the replacement sector within the same block and the spare area 9.
There are two types of alternative sectors. Therefore, as will be described later, a replacement destination for a defective sector is distinguished by a flag recorded as replacement management information. FIG. 3 shows a specific example of the replacement management information. In the figure, 12 is the aforementioned flag (F), 13 is the replacement source address recorded in the upper 3 bytes, and 14 is a relative number recorded in the lower 1 byte. In this embodiment, the flag 2 is set to "O" when the replacement destination of the defective sector is an alternative sector in the same block, and is set to "1" when it is an alternative sector in the spare area 9. The replacement source address 13 is the address before replacement processing is performed, that is, the address of the defective sector, and the replacement source address is recorded in the same manner as before.The relative number 14 is recorded in place of the replacement destination address. , the intra-zone alternative area 11 of each block 8 and the alternative area of the spare area 9 are numbered, respectively, so that the alternative sectors can be indicated.For example, the intra-zone alternative area 11 and the spare area 9 of each block 8 A number is assigned to each alternative area based on the first address of , and this number is used instead of the replacement destination address. Therefore, when a defective sector occurs, flag 12 first indicates that the replacement area is in the same block. The address of the alternative area can be specified by a relative number.The operation of the above embodiment will be explained next.
The replacement management information registration process will be explained with reference to the drawings. S (step) 1 is the detection of a defective sector, and when a defective sector is detected here, the control unit 5 checks the remaining number of alternative sectors in the same block as the defective sector in S2. If a replacement sector remains in the same block in S2, the relative number of the intra-zone replacement area 11 in the same block as the defective sector is calculated in S3. That is, a relative number indicating the position of the target alternative sector from the beginning is determined, and the obtained result is registered in the map of the magneto-optical disk 3 in S4 as shown in FIG. Note that here we used alternative sectors within the same block, so
The flag is "0" and the address of the defective sector is registered as the replacement source address. On the other hand, if no alternative sectors remain in the same block in S2, the remaining number of alternative sectors in the spare area 9 is checked in S5. Here, if an alternative sector remains, the relative number of the alternative sector from the beginning is determined in S6 in the same way as above, and the obtained result is determined in S4 as shown in FIG. It is registered in the map of the magnetic disk 3. In this case, since the alternative sector in the spare area 9 is used, the flag is set to "1" and the replacement source address is also registered in the same way. After that, in S8, the replacement management information of the replacement sector is updated. Note that if no alternative sector remains in the spare area 9 in S5, error processing is performed in S7. Next, the operation of the host computer 2 when accessing a certain sector will be explained with reference to FIG. First, host computer 2 specifies a sector in SL,
When the address is specified, the control unit 5 checks whether the specified sector is mapped on the magneto-optical disk 3 in S2. Here, if the replacement management information for the designated sector is not on the map, replacement processing for that sector is not being performed, so the designated sector is accessed in S3. On the other hand, if the replacement management information for the sector specified in S2 is found in the map, the replacement process for the specified sector is being performed, so the flag is first checked in S4. As described above, this flag distinguishes whether the replacement destination is in the same block as the defective sector or in the spare area, and is registered as replacement management information during replacement processing. If the flag is "O" in S4, it has been replaced with an alternative sector in the same block, so proceed to S5, where the address of the alternative sector of the block is calculated from the relative number registered in the map, and the address is obtained. access the specified address. On the other hand, if the flag is "1" in S4, the alternative sector in the spare area 9 is being used, so proceed to S6 and find the address of the alternative sector in the spare area 9 from the relative number in the same way as above. , access that address. [Effects of the Invention] As explained above, according to the present invention, the replacement destination address of a defective sector is indicated by distinction information and a relative number, so the amount of information is the same as before, but the storage capacity is reduced. can be effectively reduced. Specifically, in the past, 6 bytes were required for the replacement address and replacement address, but in the present invention, the replacement address requires only 1 byte for the relative number and distinction information, reducing the total to 4 bytes. Therefore, there is an effect that the storage capacity of replacement management information can be saved by one-third compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the information recording/reproducing device of the present invention, FIG. 2 is an explanatory diagram schematically showing the recording area of a magneto-optical disk, and FIG. 3 shows a specific example of replacement management information. An explanatory diagram, FIG. 4 is a flowchart showing the registration process of sector replacement management information, FIG. 5 is an explanatory diagram showing replacement management information when the alternative sector is a sector in the same block as the defective sector, and FIG. 7 is an explanatory diagram showing replacement management information when the replacement sector is a sector in a spare area, and FIG. 7 is a flowchart showing the operation when accessing a sector. 1... Information recording and reproducing device 2... Host computer 3... Magneto-optical disk 5... Control unit 8... Block 9... Spare area 11... Alternative area in zone 12... Flag 13...Replacement source address 14...Relative number 2 Figure Figure Figure

Claims (1)

[Scope of Claims] A recording area of a recording medium is divided into a plurality of blocks and a spare area for preliminary recording, and an alternative area is provided for each block, and when a defective sector occurs in the recording medium,
In an information recording/reproducing device that performs replacement processing with a replacement sector in the same block as this defective sector or with a replacement sector in the spare area, it is determined whether the defective sector is replaced with a replacement sector in the same block or with a replacement sector in the spare area. It is characterized by having means for registering discrimination information for distinguishing whether the sector has been replaced and a relative number given to each of the blocks and the spare area, and using the discrimination information and the relative number to indicate a replacement destination of the defective sector. Information recording and reproducing device.