JPH0235664A - Logic sector write system for magnetic disk controller - Google Patents

Abstract

PURPOSE:To prevent abnormal end in a readout operation for a magnetic disk device from being generated by updating a logic sector in a physical sector read out by the readout operation executed in one preceding step by write data in a write operation when an operation is the write operation on the same logic sector as that executed in one preceding step. CONSTITUTION:As for the indication of the write operation on the logic sector from a host device 1, it is checked whether or not it is the write operation on the same logic sector as that on the logic sector executed in one preceding step. When it is the write operation on the same logic sector, the data of the physical sector read out from the magnetic disk device 5 executed in one preceding step is used without performing the readout operation on the physical sector in which the logic sector exists. In such a way, even in the case of interrupting the write operation on the physical sector of the magnetic disk device 5 due to an unknown cause, it is possible to prevent the abnormal end in the readout operation on the magnetic disk device 5 from being generated even by performing the write operation on the same logic sector successively from the host device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a logical sector writing method for a magnetic disk control device used in an information processing device.

[Conventional technology]

The logical sector writing method of conventional magnetic disk controllers is
When there is a write operation instruction from a host device to a logical sector, a read operation is always performed on the physical sector of the magnetic disk device where this logical sector exists, and the logical sector within the read physical sector is used as the write operation instruction. The existing write data is updated and the updated logical sector is written to the physical sector of the magnetic disk device.

[Problem to be solved by the invention]

The above-mentioned conventional logical sector write method for magnetic disk controllers performs a read operation on the physical sector of the magnetic disk device every time there is a write operation instruction to the logical sector from the host device. If a write operation to the device is interrupted for some reason, an error code is recorded in the physical sector, so if a write operation instruction to the same logical sector is received from the host device in succession, this logical sector will not exist. There is a problem in that a read operation of a physical sector always ends abnormally.

An object of the present invention is to prevent read operations from a magnetic disk device even if a write operation to a physical sector of a magnetic disk device is interrupted for some reason, when a host device continues to perform a write operation to the same logical sector. An object of the present invention is to provide a logical sector writing method for a magnetic disk control device that does not cause abnormal termination of operation.

[Means to solve the problem]

A logical sector write method for a magnetic disk control device according to the present invention is a logical sector write method for a magnetic disk control device that controls a write operation in logical sector units of a magnetic disk device in which a logical sector exists within a physical sector. checking means for checking whether a write operation to a logical sector from a host device is a write operation to the same logical sector as a write operation to a logical sector executed immediately before; If the write operation is to a logical sector different from the previously executed write operation to the logical sector, read means for reading the physical sector of the magnetic disk device in which the logical sector exists; a new updating means for updating a logical sector in a physical sector with write data of a write operation to the logical sector; and a new updating means for updating the physical sector data read by the reading means to a physical sector of a magnetic disk device in which the logical sector exists. If the write operation to the same logical sector as the write operation to the logical sector executed one time ago is performed by the write means to write and the check means, the write operation to the logical sector executed one time ago causes the magnetic and continuous updating means for updating a logical sector in a physical sector read by a read operation to a physical sector of the disk device with write data of a write operation to the logical sector.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an information processing apparatus using the present invention, and the configuration will be explained using this diagram. The host device 1 controls a program, and is connected to a memory 2 for storing the program, a system console 3 for controlling the interface between the operator and the program, and a magnetic disk control device 4 to which the present invention is applied. A magnetic disk device 5 is connected to the magnetic disk control device 4 .

FIG. 2 is a flow diagram of one embodiment of the present invention. Upper device 1
When a write operation is instructed to a logical sector from If the write operation is to a sector, the read means executes a read operation to the physical sector of the magnetic disk device 4 in which the logical sector exists in step S2.

After the reading means, in step S3, the updating means updates the logical sector in the physical sector read by the reading means with the write data of the write operation to the logical sector. after that,
In step S4, the read operation to the physical sector updated by the new writing means writes the read physical sector data to the physical sector of the magnetic disk device 5 where the logical sector exists, and the process ends.

On the other hand, if the write operation of the same logical sector as the write operation of the logical sector executed previously in step S1, step S1
5, the write operation to the logical sector executed previously by the continuation writing means is performed to write the logical sector in the physical sector read by the read operation to the magnetic disk device 5 to the logical sector. Update with data and then fly to Ste-Tsubu S4.

〔Effect of the invention〕

As explained above, the present invention checks whether or not the write operation to the logical sector is the same as the write operation to the logical sector that was previously executed in response to a write operation instruction from the host device to the logical sector. However, if the write operation is to the same logical sector, the read operation to the physical sector where the logical sector exists is not performed, but by using the physical sector data read from the magnetic disk device at the time of the previous execution. Even if a write operation to a physical sector of a magnetic disk device is interrupted for some reason, even if the host device continues to write to the same logical sector, the read operation to the magnetic disk device will end abnormally. It has the effect of never becoming.

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DESCRIPTION OF SYMBOLS 1... Host device, 2... Memory, 3... System console, 4... Magnetic disk control device, 5...
Magnetic disk device.

Claims (1)

[Claims] In the logical sector write method of a magnetic disk control unit that controls write operations in units of logical sectors in a magnetic disk unit in which logical sectors exist within physical sectors, a write operation to a logical sector from a host device is performed immediately before the previous write operation. checking means for checking whether or not the write operation to the logical sector is the same as the write operation to the logical sector executed previously; In the case of a write operation to a sector, a read means for reading a physical sector of a magnetic disk device in which the logical sector exists, and a read means for reading a logical sector in the physical sector read by the read means for a write operation to the logical sector. a new update means for updating with write data; a write means for writing the physical sector data read by the read means into the physical sector of the magnetic disk device where the logical sector exists; and a new update means for updating the data by the check means. If the write operation is to the same logical sector as the write operation to the previously executed logical sector, the data in the physical sector that was read by the read operation to the physical sector of the magnetic disk device due to the write operation to the logical sector executed immediately before is 1. A logical sector write method for a magnetic disk control device, comprising: continuous updating means for updating a logical sector with write data of a write operation to the logical sector.