JPH01235075A - Disk memory controller - Google Patents

Abstract

PURPOSE:To surely assure the data by providing the substitute sectors to a part of the sector groups forming a unit memory area of a disk memory and writing the data into a selected substitute sector. CONSTITUTION:A disk memory 6 provides a substitute sector part 60 at a part of a group of many sectors and a substitute sector control sector 61 which stores the logical address of the sector used as a substitute sector. Then a sector if includes a write error is regarded as a defective one and one of those substitute sectors prepared at the part 60 is selected. Thus the data to be written into the defective sector are written into the selected substitute sector. In such a way, the data written into the memory 6 are surely assured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a disk memory used as an external storage device of a computer system.

(Prior Art) Disk memories are frequently used as external storage devices in combination systems because of their large storage capacity ω and their ability to be randomly accessed.

Such disk memory is usually connected to a computer via a disk memory control device, and the disk control device controls data writing or reading according to data write or read commands from the computer. It is configured to send and receive data between the two.

In such systems, in order to transmit and receive data to and from the disk memory at high speed, there is a system in which a cache type system buffer door is disposed between the computer main body and the disk memory control device.

In a system using this cache method, data that should be stored in disk memory is transferred to the system buffer, and the transferred data is saved when the system buffer runs out of space or when an instruction to start the system buffer is issued. When issued, actually disk memory control′! ! Written to disk memory by the A location.

[Problem that the defense is trying to solve] However, in a system using the Gear Fushi 1 method as described above, even if a write error occurs on the disk memory side, the computer itself cannot transfer the next new data to the system buffer. Until then, another 91! Since the IL method is being executed, it is not possible to immediately know that the error was caused by the benshi.

For this reason, a problem has arisen in that it is not possible to guarantee whether the data stored in the disk memory is normal.

An object of the present invention is to provide a disk memory system AGA that can reliably guarantee the data stored in the disk memory.

[Means for Solving the Problems] In the present invention, an alternative sector is provided in a part of a sector group constituting a unit storage area of a disk memory, and a disk driver is configured to select this alternative sector and damage data. It is something.

(Operation) Data for the sector in which a write error occurred is written to an alternative sector. This ensures that the data is guaranteed.

(Embodiment) FIG. 1 is a system block diagram showing an embodiment of the present invention, in which a disk control device 1 is connected to a central processing unit (CPU) 3 via a system buffer 2, and a user program 4 of CPtJ3 is The operating system 5 responds to the generated data read or write command.
is activated and is configured to send and receive data via the system buffer 2.

A disk memory 6 is connected to the disk memory control device 1, and reads and writes data therefrom.

FIG. 2 is a block diagram showing the detailed configuration of the disk control device 1, which is composed of a disk driver 10 and a disk controller 11, and the disk driver 10 has an alternative sector that stores the logical address of a sector set as an alternative sector. A management section 12 is provided. On the other hand, the disk memory 6 is provided with an alternative sector section 60 as part of a sector group consisting of a large number of sectors, and an alternative sector management sector 61 that stores the logical address of the sector used as an alternative sector. It is provided.

FIG. 3 is a flowchart showing the operation when writing data, in which the disk driver 10 receives a data write request from the operating system 5, analyzes this request, and then writes data to the disk controller 11. The disk controller 11 sends various commands for the system buffer 2.
Writes data stored in . When the writing is completed, a completion status signal is sent back to the disk driver 10.

The disk driver 10 monitors whether a trouble error signal is included in the completion status signal, but if a rewrite error has occurred, it considers the sector to be a bad sector and replaces it. One of the alternative sectors prepared in the sector section 60 is selected, and data for the defective sector is written into this alternative sector. After this, the logical address of the replacement sector is set to 1. of the bad sector. a31 address and stored in the alternative sector management unit 12 and the alternative sector management sector 61.

Therefore, the alternative sector management unit 12 and the alternative sector management sector 61 store information as to which alternative sector has replaced the bad sector in which the write error has occurred. In this case, when the power is partially turned off, the contents of the alternative sector management section 12 are erased, so the contents of the management sector 61 must be transferred to the management section 12 when the power is turned on.

Note that since the number of sectors prepared in the alternative sector 60 is limited, a write abnormality is reported when all the alternative sectors are used.

[Effect of excuse]

As described above, in the present invention, an alternative sector is provided and data to the sector where a write error has occurred is written to this alternative sector, so that data written to the disk memory can be reliably preserved. It has the effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing an embodiment of the present invention;
FIG. 2 is a block diagram showing the detailed configuration of the disk memory system, and FIG. 3 is a flowchart showing the data write operation. 1... Disk memory system device, 2... System buffer, 3... CPU, 6... Disk memory,
DESCRIPTION OF SYMBOLS 10... Disk driver, 11... Disk controller, 12... Alternative sector management part, 60... Alternative sector part, 61... Sector for alternative sector management. Figure 1 Figure 2

Claims (1)

[Claims] In a disk memory control device that sends and receives data via a cache-type system buffer, an alternative sector is provided in a part of a sector group constituting a unit storage area of the disk memory, and data is written in the disk memory control device. A disk memory control device comprising: a disk driver that selects the alternative sector when an error occurs and writes data to the sector in which a write error has occurred.