Information recording and reproducing apparatus including both d

Details Information recording and reproducing apparatus including both d Information recording and reproducing apparatus including both d

Filed on

1993-02-16

Date issued

1994-05-17

Examiner

Gossage, Glenn

Patent Class

Boots, shoes, and leggings

Other Related Categories

395575, 364DIG1, 365228, 371 81, 371 101, G06F 1216, G06F 1120

Type

Patent

Status

active

Patent number

053136128

Description

ABSTRACT:
An information recording and reproducing apparatus has a plurality of optical disk drives including a data optical disk drive for storing data, a work or backup optical disk drive for temporarily storing the data and, preferably, a disk cache memory. The optical disk drives are coupled to a host device such as a central processing unit (CPU) through an optical disk control unit for controlling recording and reproduction of the data. The optical disk control unit writes commands and data transmitted from the host device into the work optical disk drive and the disk cache memory and, if required, writes the data of the disk cache memory into the data optical disk drive. The optical disk control unit, on activation of the apparatus following a malfunction, restores the data of the data optical disk drive to the most recent state thereof by using the contents of the work optical disk drive, whereby the number of times of writing to an optical disk is decreased by using the disk cache memory so as to prevent the data loss on occurrence of problems in functioning of the apparatus, such as power failure or hardware error.

REFERENCES:
patent: 4077059 (1978-02-01), Cordi et al.
patent: 4837680 (1989-06-01), Crockett et al.
patent: 4862411 (1989-08-01), Dishon et al.
patent: 4870565 (1989-09-01), Yamamoto et al.
patent: 4916605 (1990-04-01), Beardsley et al.
patent: 5051887 (1991-09-01), Berger et al.
Nikkei Electronics Mar. 11, 1985, pp. 159-187.

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