JPH0327433A - Electronic disk device - Google Patents

Abstract

PURPOSE:To prevent a data change by detecting an uncorrectable error in reading after restoration. CONSTITUTION:In the saving/restoring processing of data with a magnetic disk device 3, an ECC (error correction code) generation correction circuit 24 detects and corrects an ECC error without functioning an error generation circuit 25 and a magnetic disk control circuit 22 writes the data for which the ECC generation/correction circuit 24 corrects into the magnetic disk device 3 with error information. At the time of a restoring processing, ECC generation/ correction circuit 24 generates ECC for the data which the magnetic disk control circuit 22 reads. When an uncorrectable error is detected, the error generation circuit 25 inverts the several bits of ECC, the data where the uncorrectable error occurs is generated and written into a memory circuit 26. When the uncorrectable error is not detected, the data is written into the memory circuit 26 without functioning the error generation circuit 25. Thus, the data alteration can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic disk device, and more particularly to an electronic disk device that saves/restores data on a magnetic disk device.

BACKGROUND OF THE INVENTION Conventionally, electronic disk drives of this type have been provided with means for saving/restoring information identifying data in which an uncorrectable error has occurred in the magnetic disk drive.

Problems to be Solved by the Invention Therefore, in a conventional electronic disk device, if an uncorrectable error is detected during save processing to a magnetic disk device and the save continues, ECC' (error correction) will be applied to erroneous data during restore processing. code>
is generated, and when the data is read out, there is a drawback that incorrect data is read out without causing an error.

The present invention has been made in view of the above-mentioned conventional situation,
Accordingly, an object of the present invention is to provide a novel electronic disk device that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, an electronic disk device according to the present invention is an electronic disk subsystem including an electronic disk processing device, an electronic disk device, and a magnetic disk device, in which the electronic disk device is an electronic disk device. The electronic disk device is connected to a disk processing device and a magnetic disk device, and the electronic disk device includes an electronic disk interface control circuit that controls an interface with the electronic disk processing device, a magnetic disk control circuit that controls the magnetic disk device, and a data and E-disk interface control circuit that controls the interface with the electronic disk processing device.
A memory circuit that stores CC, and an E that generates ECC to be stored in the memory circuit and detects and corrects ECC errors.
a CC generation correction circuit; a memory control circuit that controls reading and writing of the memory circuit; and an error generation circuit that inverts several bits of the ECC generated by the ECC generation correction circuit to generate data in which an uncorrectable error occurs. Normally, during data read/write processing with the electronic disk processing device, the ECC generation correction circuit does not function the error generation circuit.
Generates a CC and detects and corrects ECC errors, and in data save/restore processing with the magnetic disk device, the ECC generation correction circuit detects and corrects ECC errors without causing the error generation circuit to function during save processing. The magnetic disk control circuit detects and corrects the data corrected by the ECC generation correction circuit along with error information indicating whether or not an uncorrectable error is detected by the ECC generation correction circuit. When writing to a disk device and performing a restore process, the ECC generation/correction circuit generates an ECC for data read by the magnetic disk control circuit, the magnetic disk control circuit generates an ECC, and the magnetic disk control circuit generates an ECC. If an uncorrectable error is detected based on the read error information, the error generation circuit inverts several bits of the ECC to create data that causes an uncorrectable error and writes it into the memory circuit;
It is characterized in that if an uncorrectable error is not detected, writing is performed in the memory circuit without making the error generating circuit function.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

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

In FIG. 1, an electronic disk device 2 according to the present invention includes:
It is connected to an electronic disk processing device 1 and a magnetic disk device 3. The electronic disk device 2 includes an electronic disk interface control circuit 21 that controls the interface with the electronic disk processing device 1, a magnetic disk control circuit 22 that controls the magnetic disk device 3, and a data and EC interface control circuit 21 that controls the interface with the electronic disk processing device 1.
a memory circuit 26 that stores C; an ECC generation/correction circuit 24 that generates ECC to be stored in the memory circuit 26 and detects and corrects ECC errors; and a memory control circuit 23 that controls reading/writing 5-6 of the memory circuit 26. and an error generation circuit 25 that inverts several bits of the ECC generated by the ECC generation and correction circuit 24 to create data in which an uncorrectable error occurs.

Normally, in data read/write processing with the electronic disk processing device 1, the error generating circuit 25 is not activated and ECC is executed.
The generation/correction circuit 24 generates ECC and detects and corrects ECC errors.

In data save/restore processing with the magnetic disk device 3, the ECC generation and correction circuit 24 detects and corrects ECC errors without making the error generation circuit 25 function during the save process, and the magnetic disk control circuit 22 detects and corrects ECC errors. , the data corrected by the ECC generation and correction circuit 24 is written to the magnetic disk device 3 along with error information indicating whether an uncorrectable error has been detected or not detected by the ECC generation and correction circuit 24.

During the restore process, the ECC generation/correction circuit 24 generates an ECC for the data read by the magnetic disk control circuit 22, and if an uncorrectable error is detected based on the error information read by the magnetic disk control circuit 22, an error occurs. The circuit 25 inverts several bits of the ECC, creates data that causes an uncorrectable error, and writes it into the memory circuit 26. If an uncorrectable error is not detected, the data is written into the memory circuit 26 without making the error generating circuit 25 function. conduct.

Effects of the Invention As explained above, according to the present invention, even if data is read that causes an uncorrectable error when data is saved to a magnetic disk device, even if the save processing is continued, the readout after restoration is performed. By detecting uncorrectable errors, it is possible to prevent data corruption.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an electronic disk subsystem according to the present invention.

Claims (1)

[Claims] In an electronic disk subsystem including an electronic disk processing device, an electronic disk device, and a magnetic disk device, the electronic disk device is connected to the electronic disk processing device and the magnetic disk device, and the electronic disk device is connected to the electronic disk processing device. an electronic disk interface control circuit that controls an interface with the device; a magnetic disk control circuit that controls the magnetic disk device; a memory circuit that stores data and ECC; and generation of ECC and ECC to be stored in the memory circuit. an ECC generation and correction circuit that detects and corrects errors; a memory control circuit that controls reading and writing of the memory circuit; and an ECC generation and correction circuit that detects and corrects errors;
and an error generation circuit that inverts several bits of the ECC generated by the generation correction circuit to create data in which an uncorrectable error occurs, and the error generation circuit is used in data read/write processing with the electronic disk processing device. ECC generation and ECC error detection and correction are performed in the ECC generation and correction circuit without functioning, and in data save/restore processing with the magnetic disk device,
During save processing, the ECC generation and correction circuit detects and corrects the ECC error without making the error generation circuit function, and the magnetic disk control circuit detects and corrects the ECC error.
The ECC along with error information indicating whether an uncorrectable error is detected or not detected in the generation correction circuit.
The data corrected by the generation correction circuit is written to the magnetic disk device, and during the restore process, the data read by the magnetic disk control circuit is written to the EC.
The C generation correction circuit generates an ECC, and if an uncorrectable error is detected from the error information read by the magnetic disk control circuit, the error generation circuit inverts several bits of the ECC to generate an uncorrectable error. create data and write it into the memory circuit;
An electronic disk device characterized in that if an uncorrectable error is not detected, the error generation circuit is not made to function and data is written in the memory circuit.