JPH01243268A - Data recording control system - Google Patents

Abstract

PURPOSE:To efficiently carry out the recording by sharing an alternately recording area to plural tracks, providing a high speed buffer for withdrawing data for the rerecording purpose whenever a defective block is detected and processing the rewrite of the withdrawn data in the lump. CONSTITUTION:After receiving an instruction from a CPU 1, the positioning of a head is performed onto a track. Afterward, written data from the CPU 1 are received by a buffer memory 3 on the side of A. Then, the write process W of the data in the memory 3 on the side of A to a disk 6 and the check of the read-out of the disk 6 are carried out. Meanwhile, written data of the following block are received by the memory 3 on the side of B, thus repeating by changing the memory 3 to the other side. Data are withdrawn into a buffer memory C4 each time when a defective block is detected during said write operation, so as to continue the write operation. Then, the rewrite of the data of the memory C4 is subsequently performed in the lump.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording control system, and particularly to a data recording control system using a rotary recording medium having a data recording area spanning a plurality of information tracks. [Prior Art] Conventionally, data is reproduced (hereinafter also referred to as "reading") from multiple blocks on a rotating recording medium such as a magnetic disk device.
When recording with check, if a recording (also referred to as 1-write) bad block is detected, a replacement area is allocated to another location, a pointer to the replacement area is written in the bad block area, and the bad block is deleted. Data to be recorded is recorded (saved) in a spare area, and when the defective block area is accessed later, the spare area is accessed using the pointer and the necessary data is retrieved. In this case, each time a defective block area is detected, the head is repositioned to a replacement area and access is made for data evacuation recording and reproduction.

When this type of data recording control method is applied to a recording medium with low reliability such as an optical disk, if the spare area is frequently accessed, the head must be repositioned each time, making it difficult to record. must be interrupted, reducing efficiency.

Therefore, in order to improve this decrease in efficiency,
As shown in Japanese Patent No. 1-181163, a spare area is provided at the rear end of each information track, and during the waiting time for disk rotation to access the spare area of any information track, the next information track is A data recording control system for a rotating recording medium such as an optical disk has been proposed, in which a writing or reading check is performed in advance.

[Problem to be solved by the invention]

The prior art disclosed in the above-mentioned publication does not take into account the reduction in efficiency when relief cannot be performed in the replacement area at the end of each information track. That is, in the above-mentioned conventional technology, a spare area of 1 to 3 sectors (blocks) is provided at the end of each track, and a defective block occurring in the front of the track is attempted to be relieved in these spare areas. If more defective blocks occur, it is necessary to access a replacement area on another track, which increases the processing time. On the other hand, it is possible to reduce the processing time by increasing the number of blocks in the spare area of each information track and reducing the frequency of access to the spare area of another track. There is a problem that the information recording area is reduced and the efficiency of use of the medium is reduced. Furthermore, during the period when the head is repositioned to a different track and rewritten, the recording operation to the original data area is interrupted, resulting in an increase in processing time.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to write data across multiple information tracks and rewrite data to a replacement area when a writing failure is detected, without reducing the usage efficiency of the recording medium. To provide a data recording control method that enables operations to be executed quickly and smoothly and to efficiently write data without interrupting original data writing. be.

[Means to solve the problem]

In order to achieve the above object, in the data recording control method of the present invention, the user data recording area includes a plurality of tracks, a replacement recording area for the user data recording area is provided to be shared by the plurality of tracks, and the data recording and When performing a playback check, a high-speed buffer memory is provided to save data for re-recording each time a recording defective block is detected from each track, and after the recording of data to the plurality of tracks is completed, the data is saved in the buffer memory. The data for re-recording, which has been saved in the memory area, is processed all at once, that is, it is taken out all at once and recorded in the shared spare recording area.

[Effect]

The operation based on the above structure will be explained. Data is written to a user data recording area including a plurality of information tracks, and the written data is read and checked. Whenever a writing defect is detected by a read check operation, the data to be rewritten to the alternate recording area is saved in block units (sector units) on the high-speed buffer memory, and at that time, user data The original writing process to the recording area continues without interruption. Then, after the writing process to a series of user data recording areas spanning multiple tracks is completed, the blocks of data saved in the buffer memory are rewritten to the alternate recording area all at once. . As described above, according to the above configuration, by sharing the spare recording area among multiple tracks, the size of the spare area required to repair all the predicted bad blocks can be changed for each track. Compared to the case where a spare area is provided, the space can be narrower, so the usage efficiency of the recording medium is increased.

In addition, each time a bad block is detected, rewrite data is saved in the high-speed buffer memory, and the saved data is rewritten all at once after a series of data has been written. The original user data writing process is not interrupted, and the data is rewritten all at once, resulting in a significant reduction in data processing time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
5 to 5 illustrate the principle of the present invention.

FIG. 3 shows an example of the configuration of a disk system, in which a disk drive device 5 is equipped with a rotating recording medium 6 such as an optical disk, and performs operations such as writing and reading on the disk 6. A CPU (central processing unit) 1 is a host device of the disk drive device 5. Data control device 2
receives and receives commands from the CPU, which is a host device, and controls the disk drive device 5. In this configuration example, the disk controller 2 includes a buffer memory 3 that is a high-speed IC memory.
(A, B) and one buffer memory 4 (C).

FIG. 4 shows the track format on the disk disk 6, with spiral tracks, which may also be formed concentrically.

The trunks N-1, N, N+1 .・・・・・・
..., and each track is further divided into a plurality of sectors each having a unique address (sectors 0, 1......n-2, n
-1). Information is recorded on the disk 6 sector by sector, and this information recording unit is called a block.

FIG. 5 shows an example of allocation of data areas on the disk 6, in which the data areas include a plurality of user block areas (each consisting of a plurality of tracks) 61, a replacement block area for each user block area (
62, each of which is shared by a plurality of tracks, and a common replacement block area 63 that is common to all user block areas. In this embodiment, the number of sectors (blocks) per track is 17, and the value of m is also 1.
7, that is, the replacement block area 62 for the user block area 61 is tracked at maximum for every 17 main tracks.
Each duty is set. If a defective block is detected in the user block area 61 during writing, a replacement block is allocated on the replacement block area 62 for the user block area. Further, when all the spare blocks on the user area have been allocated, the spare blocks are allocated on the common spare block area 63. In this way, in this embodiment, a spare block area 62 for each user block area and a spare block area 63 for all user block areas are provided as spare recording areas shared by a plurality of tracks.

In the above-mentioned disk system, a write operation of multiple tracks will be explained as an example with reference to FIG. In FIG. 1, a write operation W and a read check operation R1 are performed in synchronization with a disk 6 rotating at a period T. Buffers 7 and memories A and B are used.

C1 and tracks m to 2m to be accessed are shown expanded in space and time. In the figure, the boundary line moving from R to W is the end point of the read check. In the operation example, track m
This is writing from track 2m-1 to track 2m-1.

After receiving a command from the host device 1, first the head is positioned on the track m. Thereafter (prior to write processing W), write data is received from the host device to the A side of the buffer memory 3. Thereafter, a write process W of data stored in the A side of the buffer memory 3 to the disk 6 and a read check R from the disk 6 are performed. This process (W
, R), the write data of the subsequent block is received on the B side of the buffer memory 3. By repeating these operations while switching the buffer memory 3, data is written up to the user block area 6 on track 2m-1. If a defective block is detected in the above write operation, after completing the 7-check reading of each block, the data for rewriting to the replacement block area 62 is transferred to the buffer memory of C under the control of the microprocessor in the control device 2. 4 and continue writing to the user block area 61. Writing to the replacement block area 62 for the user block area is as follows:
This is performed using the data saved in the buffer memory 4 following the completion of writing in each user block area.

Similar to FIG. 1, FIG. 2 shows an example of the timing of saving rewrite data to the spare block area. In FIG. 2, it is written that the rewrite data is saved after the read check R is completed, but if no defective block is detected, the data is not saved. Also, in FIG. 1, it is written that the rewriting operation to the replacement block area (part of track 2m-1) for the user area is performed using buffer memory C, but if a defective block is detected in the user block area. When it is not detected, the rewriting operation of the replacement block area is not performed. Furthermore, if the spare blocks for the user block area are exhausted (even if bad blocks remain), rewriting processing to the common spare block area is performed.

FIG. 6 is a flowchart showing the write operation according to the embodiment of the present invention. When the disk control device 1 W2 receives a write command from the host device 1, it performs head positioning (71), then receives one track of write data on the A side of the buffer memory 3, and then starts the write process (72). .

Here, check whether there is a write instruction for the next track (73), and if there is an instruction, switch the buffer side to B and receive the next write data (74),
If there is no instruction, the readout of buffer A is immediately checked (75). If a bad block is detected in the read check <76>, the data is saved in buffer C (77). Here, it is checked whether the final track instructed by the host device has been completed or whether the final track of the user block area 61 (one place before the replacement block area 62) has been completed (78). Returning to the operation of switching the buffer plane and receiving the write data (74), the above operation is repeated. When the last track is completed, the presence or absence of defective data saved in buffer C is checked (79), and the defective data is collectively processed to the replacement area (80), and if there is any unprocessed write instruction ( 81), write data reception (72
) and exit if there are no instructions.

In the embodiments shown in FIGS. 1 and 2, the write operation and the read check operation are performed during different rotation periods of the disk, but the write operation and the read check operation are performed during the same rotation period. You may also do so. Furthermore, although FIG. 2 describes a case in which data is saved after completing a read check of a plurality of public blocks, data may be saved immediately upon detecting a defective block during a read check operation.

In the embodiment shown in FIG. 5 above, the replacement block area is composed of one for each user block area 61 and one common to all user block areas 63, but in addition to the conventional one dedicated to each track. May be added. For example, in the case of the aforementioned 17 blocks/1 track and 17 tracks/1 user block area, only the last 1 block (sector) of the 11-rack is used as the replacement area, and the remaining 16 blocks are used as the user data area. 16 such tracks (256 blocks for user data area, 16 blocks for replacement area) constitute one user block area,
The entire 17th track can be used as a spare area shared by the 1st to 16th tracks. When the number of bad blocks in each track is 1 or less, a dedicated spare area is allocated to each track, and when the number of bad blocks is 2 or more, a spare block area 62 for the user block area is allocated, and the area 62 becomes full. For example, a common replacement block area 63 having a capacity for multiple tracks is allocated.

FIG. 7 shows a schematic configuration of a controller for an optical disk device as an example of a control device for executing the above-described recording control method.

In the figure, 21 is an interface controller that controls signal reception with a higher-level device 1 such as a channel device or host computer, and 22 is an interface controller that realizes the recording operation described above in response to commands from the higher-level device 1. a microprocessor for operating the control device according to a predetermined procedure; 23;
24 is a memory for storing microinstructions that define control operations by the microprocessor 22; 24 is a write circuit that modulates information taken out from the buffer memory 3 or buffer memory 4 and outputs the modulated information to the optical head circuit 28; 25; shows a reading circuit for demodulating the output signal from the optical head circuit 28 and storing it in the buffer memory 3 or buffer memory 4.

In addition, 27 is a selector for selecting the buffer memory 3 or 40 input/output hash, and the microprocessor 2
2, the interface bus 34, processor bus 32, and R/
W circuit bus 31 is selectively connected to buffer memory 3 or 4.

According to this embodiment, since a plurality of buffer memories are provided, even if a defective block is detected during a write operation, the rewrite data is saved in the buffer memory C, so that the user block area can be saved. Writing operations can be continued without rotation loss. When using three buffer memories A, B, and C2, that is, buffer memory 3 (A, B) for performing alternating and continuous writing, and buffer memory C for saving bad blocks for replacement processing. , the capacity of buffer memories A and B should be at least one track each, and the capacity of memory C should be equal to the maximum number of bad blocks expected to occur in one command, and the capacity of buffer memory can also be small. . Furthermore, since the spare block area is shared by a plurality of tracks, rewriting processing to the spare block area can be efficiently performed for a plurality of tracks at once. In addition, the number of accesses to the common replacement block area can be reduced,
It is also effective in reducing increases in processing time.

As described above, this embodiment takes as an example a case where the spare track area 62 is provided for each user block area as a shared spare recording area, but it is also possible to use a case where only the common spare block area 63 is provided. Applicable.

〔Effect of the invention〕

As explained above, according to the data recording control method of the present invention, a spare recording area is provided to be shared by a plurality of tracks, and data for re-recording is saved every time a defective block is detected. A high-speed buffer memory is provided to store data, and after a series of data recording is completed, the saved data is recorded all at once in a shared spare recording area, so that the original data recording to the user recording area can be interrupted. You can record efficiently without any problems. Furthermore, the size of the spare recording area required to repair all predicted defective blocks can be reduced, increasing the efficiency of use of the recording medium. Furthermore, since the rewriting process to the spare recording area can be executed all at once, the spare recording area can be accessed efficiently, and the number of accesses to the spare recording area can be reduced. play.

[Brief explanation of the drawing]

1 and 2 are timing charts for explaining the data recording operation according to an embodiment of the present invention, FIG. 3 is a configuration diagram of a disk subsystem to which the present invention is applied, and FIG. 4 is a disk recording FIG. 5 is a diagram showing the track format of the medium, FIG. 5 is a diagram showing the track allocation state of the disk recording medium, FIG. 6 is a flowchart showing the operation in FIGS. 1 and 2, and FIG. 7 is an embodiment of the present invention. 1 is a block diagram of an optical disk control device to which the above is applied. 1...CPU, 2...Disk control device, 3...Buffer memory, 4...Alternation Processing buffer memory, 5
......Disk drive device, 6...
...Optical disk recording medium, 61...User block area, 62...Replacement block area for user block area, 63...
...Common replacement block area. Agent: Patent attorney Kenji Takeshi (1 other person) Figure 3 Figure 4

Claims (1)

[Claims] 1. Data is recorded on a recording medium in which each track is divided into a plurality of blocks, and has a user data recording area consisting of a plurality of tracks, and a replacement recording area for relieving a recording defective block in the user data recording area. In the data recording control method, the spare recording area is shared by a plurality of tracks, and data for re-recording is provided each time a recording defective block is detected from each track during data recording and playback inspection. A high-speed buffer memory is provided for saving the data, and after the recording of data on the plurality of tracks is completed, the data for re-recording that has been saved in the buffer memory is retrieved all at once and recorded in the shared spare recording area. A data recording control method characterized by being configured to.