JPH06124173A - Disk controller - Google Patents

Abstract

PURPOSE:To shorten the processing time of data when a reading error is generated on a count part. CONSTITUTION:This device is equipped with a count part storage buffer which houses the content of a count part. At that time, when the reading error is detected at a count part 530 of a block N, the content of the count part 530 is read, and stored in the count part storage buffer. Next, a microprocessor corrects the error of the content stored in the count part storage buffer, writes the corrected content of the count part storage buffer in the count part 530, and operates the processing of a data part 540.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk controller for correcting errors in the contents of a count section when writing data.

[0002]

2. Description of the Related Art The structure of a conventional disk controller is shown in FIG. A conventional disk controller 2 is a host interface 3 that receives data from the host processor 1 and transfers data to the host processor 1, and a host processor that controls data transfer between the host processor 1 and the disk device 7. 4 and.

The tracks of the disk device 7 are generally shown in FIG.
It is as shown in (a). The track is divided into units called sectors, and the sector is further divided into a count section and a data section. The data instructed to be written by the host processor is written on the data section 520. In addition, the count section 510 has written therein information for managing the data section. Here, when reading / writing the sector N, first, the count units are compared, it is checked whether or not it is the target sector, and if it is the target sector, the reading / writing is performed on the subsequent data unit.

Next, the processing when an error occurs in the reading of the counting section 530 of the sector N will be described with reference to FIGS. 5 (a) to 5 (d).

When the count portion 530 of the sector N has error data, the microprocessor 4 detects a read error (see FIG. 5A). Next, the microprocessor 4 reads the contents of the data part after the count part 530 in which the error is detected and stores it (see FIG. 5B). Further, the microprocessor 4 rewrites the count unit 530 that has detected the error and erases the subsequent sectors (see FIG. 5C). Finally, the microprocessor 4 writes the stored data and the counting unit after the 530th counting unit in which the error occurred (see FIG. 5D). When the above operation is completed, the data is processed again.

[0006]

The above-mentioned conventional disk control device has a drawback that it takes time to process the data of the sector when the content of the count section causes a read error.

[0007]

In a disk controller of the present invention, a host interface for receiving data from a host processor and transferring data to the host processor, and a count for storing the contents of a count section on the disk device. Part storage buffer, host processor,
A data transfer means for transferring data between the disk device and the count part storage buffer, and when a read error occurs in the count part of the disk device when writing data from the host processor to the disk device,
Storing the contents of the count part where the read error occurred in the count part storage buffer, performing error correction, writing the contents of the count part to the disk device again, and then writing the data part. And a microprocessor for performing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and the same parts as those in the conventional example of FIG. 4 are designated by the same reference numerals. The present embodiment is different from the conventional example in that a count unit storage buffer 6 for storing the contents of the count unit on the disk device is provided.

Next, an image of a track when a read error occurs in the count portion of the sector N will be described with reference to FIGS. 2A to 2C.

When there is an error in the count unit 530 of the sector N, the microprocessor 4 causes the count unit 5 to perform the first cycle.
A reading error of 30 is detected (see FIG. 2A).
Next, when a read error is detected, the microprocessor 4 reads the contents of the count unit 530 of the sector N in the second round, and issues an instruction to store it in the count unit storage buffer 6 to the data transfer means 5 (see FIG. 2B). ). Further, the microprocessor 4 error-corrects the contents of the count unit 530 of the sector N stored in the count-unit storage buffer 6, writes the error-corrected contents in the count unit 530 of the sector N in the third round, and then the data unit 540. Process (Fig. 2
(See (c)).

Next, the processing of the count section and the data section of the target sector N on the disk device will be described with reference to FIG.

First, the microprocessor 4 confirms with respect to the counting section of the target sector N whether the sector is really the target sector (step 100). Next, the microprocessor 4 checks whether or not a read error has occurred in the count portion of the sector N (step 110). Then, if there is no read error in step 110, the microprocessor instructs the data transfer means to read / write the data portion of the sector N of the disk device 7, and the data processing of the sector N ends (step 120). .

When a read error occurs in step 100, the microprocessor 4 issues an instruction to the data transfer means 5 to read the contents of the count part of the sector N and store the contents in the count part storage buffer 6 (step 130). ).

Next, the microprocessor 4 performs error correction on the contents of the count part of the sector N stored in the count part storage buffer (steps 140 and 150).

When the error correction of the count part cannot be performed in step 150, the microprocessor 4 compares the count parts for the purpose of the sector N-1 (step 160). At this time, the microprocessor 4 determines that the sector N
It is checked whether a reading error has occurred in the count unit of -1 (step 170).

When no read error occurs in step 170, the microprocessor 4 issues an instruction to the data transfer means 5 to skip the data part of the sector N-1 and the count part of the sector N, and the process proceeds to step 120 (step 120). Step 180). And step 170
If a read error occurs in, the microprocessor 4 reports an error to the host processor 1 via the host interface 3 and ends a series of operations (step 190).

If it is possible to correct the error in the count portion in step 150, the contents of the count portion in the sector N in which the error has been corrected are written in the disk device.
The process proceeds to 0 (step 200).

[0019]

As described above, in the disk control device of the present invention, the host interface for receiving data from the host processor and transferring the data to the host processor and the contents of the count section on the disk device are stored. A count unit storage buffer, a data transfer unit that transfers data between the host processor, the disk device, and the count unit storage buffer, and a count unit of the disk device when writing data from the host processor to the disk device. When a read error occurs, the contents of the count part in which the read error occurred are stored in the count part storage buffer, after correction, the contents of the count part are written again to the disk device, and then the data part is written. With a microprocessor that controls a series of operations Even if a write error occurs when writing the contents of the count section, the contents of the count section are corrected and rewritten when the next same sector is processed. There is an effect that it can be shortened.

[Brief description of drawings]

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

FIG. 2 is an image diagram of a track when a reading error occurs in a count section of a sector N in this embodiment.

FIG. 3 is a flow chart showing processing of a count part and a data part of a sector N in this embodiment.

FIG. 4 is a block diagram showing a conventional example.

FIG. 5 is an image diagram of a track when a reading error occurs in a count section of a sector N in a conventional example.

[Explanation of symbols]

 1 Host Processor 2 Disk Control Device 3 Host Interface 4 Microprocessor 5 Data Transfer Means 6 Counting Unit Storage Buffer 7 Disk Device

Claims (1)

[Claims] 1. A disk controller connected to a host processor and a disk device for recording a plurality of files; a host interface for receiving data from the host processor and transferring data to the host processor; A count unit storage buffer that stores the contents of a count unit on the disk device, a data transfer unit that transfers data between the host processor, the disk device, and the count unit storage buffer, and the host processor to the disk device. When a read error occurs in the count unit of the disk device when writing data to, the content of the count unit in which the read error occurs is stored in the count unit storage buffer, and after error correction, Again for the disk device A disk control device comprising: a microprocessor for controlling a series of operations for writing the contents of the count portion and subsequently writing the data portion.