JPH07334936A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute recording and reproducing processing in nearly the same time as the time in the case there are no defects even in the case there is a defect at a recording medium and to enable handling at a large quantity of data. CONSTITUTION:A processor section 22 for control delivers and receives various kinds of instructions or data on the states, etc., of respective sections to and from an interface section 11, an input/output control section 24 and an input/ output buffer memory section 25 while putting the data into and out of a RAM memory section 23 according to the program stored in a program memory section 21. A memory section 27 for replacement sectors consists of a solid-state memory, such as semiconductor memory, and records information in place of the defective sectors. A sector address conversion section 28 stores the correspondence table of the defective sector addresses and the memory addresses of the memory section 27 for the replacement sectors and converts the logic addresses of the defective sectors into the physical addresses of the replacement sectors within the memory section 27 for the replacement sectors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording device for recording / reproducing data on / from a rewritable and exchangeable medium such as a magneto-optical disk.

[0002]

2. Description of the Related Art In a disk device such as a magneto-optical (MO) disk device that records / reproduces data on / from a rewritable disk-shaped recording medium, the following alternatives are provided to make up for a defective portion of the recording medium. A method using sectors is used. One of them is a method called sector slipping. As shown in FIG. 4, a defective sector before or during initialization of the disk 1, a defective sector S here, is used.
When 2 is detected, the next sector S3 is used instead. Another method is a method called linear replacement, in which a special alternative sector area 4 is provided in the disk 1 as shown in FIG.
For example, the sector D1 in the substitute sector area 4 is used instead of the sector 2.

[0003]

However, the above-mentioned method has a problem that the recording / reproducing time becomes considerably longer than that in the case where there is no defective sector. That is, in the sector slipping of FIG. 4, for example, when recording information for 5 sectors, if sector S2 is a defective sector, information will be recorded for a total of 6 sectors from sectors S1 to S6. Now, assuming that the processing time of one sector is t, the processing time T1 of all the sectors S1 to S6 is T1 = 6.
t. Since the processing time T when there is no defect is T = 5t, the processing time for sector slipping is as long as the number of defective sectors.

In the linear replacement, as shown in FIG. 5, when recording information for 5 sectors, if there is a defective sector S2, the recording / reproducing head moves to a specially provided alternative sector D1. Since it must be done, the round trip times t1 and t2 take extra time,
The total processing time T2 is T2 = 5t + (t1 + t2). That is, in the conventional replacement method, the defective sector of the recording medium is replaced by the replacement sector in the same recording medium, so that the recording / reproducing head needs physical access and the processing time becomes long. For example, when an MO disk device is used as a recording / reproducing device for a computer, high-speed processing is required, and it is extremely disadvantageous if the processing time is long.

Further, in the above-mentioned linear replacement, since the replacement sector is provided on the recording medium, the defective sector information peculiar to the recording medium can be grasped at the time of recording / reproducing even if the recording medium is exchanged. The physical access by the minute recording / reproducing head also requires a lot of time, and it is difficult to handle a large amount of data such as video data and audio data while exchanging the recording medium.

The present invention has been made in view of the above circumstances, and even if there is a defect in the recording medium, the recording / reproducing process can be performed in almost the same time as when there is no defect, and a large amount of data can be handled. An object is to provide a data recording / reproducing device.

[0007]

A data recording / reproducing apparatus according to the present invention substitutes a recording / reproducing means for recording or reproducing information on a rewritable and exchangeable recording medium and a defective sector of the recording medium. Alternative sector memory means having an alternative sector for recording information, and conversion processing of the logical address and physical address of the defective sector recorded on the recording medium into the physical address of the alternative sector in the alternative sector memory means. When the recording medium is ejected, the contents of the alternative sector memory means and the sector address conversion means are written in the alternative area of the recording medium, and at the time of inserting the recording medium. The contents written in the alternative area are transferred to the alternative sector memory means and the sector address conversion means. By solving the above-mentioned problems.

In this case, the sector address conversion means uses the logical address and physical address of the defective sector recorded on the recording medium and the physical address of the alternative sector in the alternative sector memory means as an address memory. It is stored in the means and the above conversion processing is performed.

Further, it is preferable that the alternative sector memory means and the address memory means are solid-state memories. The solid-state memory may be a non-volatile solid-state memory.

[0010]

The alternative sector memory means has an alternative sector for recording information in place of the defective sector of the recording medium, and the sector address conversion means records the logical address and physical address of the defective sector recorded on the recording medium. Is converted into the physical address of the alternative sector in the alternative sector memory means, the access to the alternative sector memory means is electrical, the access time is almost zero, and the recording / reproducing time can be greatly shortened.

When the recording medium is ejected, the contents of the alternative sector memory means and the sector address converting means are written in the alternative area of the recording medium, and when the recording medium is inserted, the contents written in the alternative area. Is transferred to the alternative sector memory means and the sector address conversion means, so that a large amount of data such as video data and audio data can be handled.

[0012]

Embodiments of the data recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

This embodiment is a magneto-optical (MO) disk device for recording / reproducing data on / from a disk 1 which is a rewritable and replaceable medium, and has a structure as shown in FIG. That is, this MO disk device 10 is
An interface unit 11 connected to an external host computer H, a system control unit 12 for controlling each unit described later, a spindle motor control unit 13 connected to a disk rotation spindle motor 17, and a head carriage 18. A head positioning control section 14 connected to the read / write head 19, a read / write control section 15 connected to a read / write head 19, and a media carriage 20.
And a media / carriage controller 16 connected to the.

The system control unit 12 interprets the command of the host computer H supplied via the interface unit 11 and causes each of the control units 13 to 16 to perform the processing required to execute the command. Further, the results executed by the respective control units 13 to 16 are transmitted to the host computer H via the interface unit 11.

The spindle / motor control unit 13 starts and stops the disk rotation spindle motor 17 and controls the rotation speed according to an instruction from the system control unit 12. By this control, the disk rotating spindle motor 17 operates to rotate the disk 1 (shown in FIG. 3) which is a recording medium.

The head positioning control unit 14 controls the head carriage 18 according to an instruction from the system control unit 12. As a result, the head carriage 18 operates to move the read / write head 19 to a predetermined position.

The read / write control unit 15 finds a sector Sn for recording or reproducing information according to an instruction from the system control unit 12, and reads / writes to the sector Sn.
The write head 19 is instructed to record or reproduce information. In response to this instruction, the read / write head 19 records or reproduces information on the sector Sn of the disk 1.

The media carriage control unit 16 controls the media carriage 20 according to an instruction from the system control unit 12. This allows the media carriage 2
0 ejects / inserts the disc 1.

If the disk 1 has a defective sector, the system control unit 12 performs a correction process using the alternative sector. Hereinafter, the detailed configuration and operation of the system control unit 12 will be described with reference to FIG. 2. Before that, for the convenience of description, a conventional known defective sector correction process will be described.

The conventional alternative sector processing is realized by using a special recording area of a disk which is a recording medium and a RAM memory section. That is, the correspondence table of defective sector addresses and alternative sector addresses recorded in a predetermined area of the disk is read out and expanded in the RAM memory section when the power is turned on. When there is an instruction to access the disk from the host computer, the sector address information in the instruction is converted into a physical sector address, and if there is one that matches the defective sector address, the above correspondence table To replace the alternate sector address. The physical sector address obtained in this way is
It is composed of a cylinder address, a track address, and a sector address on the track, which are surface addresses when there are multiple recording surfaces. By sending these addresses to each control unit, the head and sector are positioned. , Perform the commanded operation.

On the other hand, the system control unit 12 of the MO disk device 10 of this embodiment performs the defective sector correction process as follows. In the system control unit 12, the control processor unit 22 transfers data to and from the RAM memory unit 23 according to a program stored in the program memory unit 21, and the interface unit 1
1. Input / output control unit 24 and input / output buffer / memory unit 2
Various commands and data such as the state of each part are transmitted to and received from the device 5. An ECC encode / decode unit 26 is connected to the input / output buffer / memory unit 25, and this is connected to the read / write control unit 15.

Further, the system control unit 12 is composed of a solid-state memory such as a semiconductor memory or the like and is used as a substitute sector memory unit 27 for recording information by substituting for a defective sector, and is used in the above-mentioned conventional defective sector correction processing. Instead of the correspondence table between the defective sector address and the alternative sector address, a correspondence table between the defective sector address and the memory address of the alternative sector memory unit 27 is stored, and the logical address of the defective sector is replaced in the alternative sector memory unit 27. A sector address conversion unit 28 for converting a physical address of a sector is provided. A solid-state memory such as a semiconductor memory is also used for the sector / address converter 28.

Now, when recording or reproducing information for 5 sectors in the sectors S1 to S5 of the disk 1 as shown in FIG. 3, it is assumed that the sector S2 is a defective sector, for example. In this case, the sector address information regarding the defective sector S2 is stored in the disk 1, and the defective sector address information in the disk 1 is read by the control processor unit 22 during the initialization process of the MO disk device 10. Then, a predetermined sector D1 of the alternative sector memory unit 27 is allocated as an alternative sector corresponding to the defective sector S2, and a correspondence table of the logical address of the defective sector S2 and the physical address of the alternative sector D1 is provided to the sector / address conversion unit 28. Remembered

When the information recording or reproducing process is started,
First, read / write to sector S1 of disk 1
Information is recorded or reproduced by the head 19. next,
When the read / write head 19 comes to the sector S2, it is determined from the correspondence table stored in the sector address conversion unit 28 that the sector S2 is a defective sector. Then, next, the alternative sector D1 of the alternative sector memory unit 27 is electrically accessed, and information for one sector is recorded or reproduced therein. Next, the sector S3 of the disk 1 is electrically accessed and recorded or reproduced, and then the sectors S4 and S5 are recorded or reproduced. Here, the time T required for recording or reproducing information for 5 sectors is 4 t for the processing time for 4 sectors of the disk 1.
And the time required to access the alternative sector D1 (t3 + t
4) and the total. Here, the sector address conversion unit 2
Since the access of 8 is an electrical process, the time required for this is almost 0. Therefore, the recording or reproducing processing time for 5 sectors is T = 5t + (t3 + t4) ≈5t
Becomes This is the time T1 = 6t due to the conventional sector slipping or the time T due to the linear replacement.
This is significantly shorter than 2 = 5t + (t1 + t2).

Further, in this MO disc device 10, when the disc 1 is ejected / inserted by the medium carriage 20 controlled by the medium carriage control unit 16 as described above, the contents of the alternative sector memory unit 27 and The contents of the correspondence table between the defective sector address and the alternative sector address are written / read at a special location on the disk 1. First, at the time of ejection, the contents of the substitute sector memory unit 27, the contents of the defective sector address and the substitute sector address correspondence table are written in a special place of the disk 1. At the time of insertion, the contents of the alternative sector memory unit 27 and the defective sector
The contents of the address / alternative sector address correspondence table are read. The special place of disk 1 here is
It is a place not used for normal data recording.

Therefore, in this data recording / reproducing apparatus,
Since it is possible to shorten the recording / reproducing processing time while exchanging the exchangeable recording medium, it is possible to handle a large amount of data such as video data and audio data.

If the alternative sector memory unit 27 or the sector address conversion unit 28 is a non-volatile solid-state memory such as an EFPROM or a battery backup RAM, the defective sectors S2 will be read from the disk 1 one by one when the power is turned on / off. It is not necessary to read the correspondence table of physical addresses and logical addresses and set or tabulate the alternative sector D1 corresponding thereto. This makes it possible to start up the MO disk device at high speed when the power is turned on, and since it is not necessary to take measures against power failure, the configuration and control are simplified.

The data recording / reproducing apparatus according to the present invention is not only applied to the MO disk apparatus described above, but also to a hard disk apparatus or a write once disk apparatus using an exchangeable disk-shaped recording medium. It is valid.

[0029]

According to the data recording / reproducing apparatus of the present invention, recording / reproducing means for recording / reproducing information on / from a rewritable and exchangeable recording medium, and information is recorded in place of a defective sector of the recording medium. And a sector address for converting the logical address and physical address of the defective sector recorded in the recording medium into the physical address of the alternative sector in the alternative sector memory means. And a writing means for writing the contents of the alternative sector memory means and the sector address converting means in an alternative area of the recording medium when the recording medium is ejected, and in the alternative area when the recording medium is inserted. Since the written contents are transferred to the alternative sector memory means and the sector address conversion means, Even if there is a Recessed, perform the recording and reproduction processing at almost the same time with the case where there is no defect, and can handle a large amount of data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a data recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a system control unit of the embodiment shown in FIG.

FIG. 3 is a diagram for explaining the operation of the embodiment shown in FIG.

FIG. 4 is a diagram showing an alternative method by sector slipping.

FIG. 5 is a diagram showing an alternative method by linear replacement.

[Explanation of symbols]

 H host computer S sector D alternative sector 1 disk 10 MO disk device 11 interface section 12 system control section 13 spindle motor control section 14 head positioning control section 15 read / write control section 16 media carriage control section 19 read / write control section Head 20 Media carriage 27 Alternate sector memory 28 Sector address converter

Claims (5)

[Claims] 1. An alternative sector memory means having a recording / reproducing means for recording or reproducing information on a rewritable and exchangeable recording medium, and an alternative sector for recording information in place of a defective sector of the recording medium. And a sector for converting the logical address and physical address of the defective sector recorded in the recording medium into the physical address of the alternative sector in the alternative sector memory means.
Address replacement means for writing the contents of the alternative sector memory means and the sector address conversion means in the alternative area of the recording medium when the recording medium is ejected, and the alternative area when inserting the recording medium. A data recording / reproducing apparatus, characterized in that the contents written in (1) are transferred to the alternative sector memory means and the sector / address converting means. 2. The sector address conversion means stores the logical address and physical address of the defective sector recorded in the recording medium and the physical address of the alternative sector in the alternative sector memory means as the address memory means. 2. The conversion process is performed by storing the data in a memory.
The described data recording / reproducing apparatus. 3. The data recording / reproducing apparatus according to claim 1, wherein the alternative sector memory means is a solid-state memory. 4. The data recording / reproducing apparatus according to claim 1, wherein the address memory means is a solid-state memory. 5. The data recording / reproducing apparatus according to claim 3, wherein the solid-state memory is a non-volatile solid-state memory.