External storage apparatus and defective block reassignment proc

Details External storage apparatus and defective block reassignment proc External storage apparatus and defective block reassignment proc

1990-12-19

1994-02-01

Beausoliel, Jr., Robert W.

Excavating

371 81, 395650, 395425, G06F 1100

Patent

active

052837904

ABSTRACT:
An external storage apparatus which includes a recording medium on which a replacing area or defective spare block area is used in place of a defective block. Reassignment processing of the replacing area to the defective block is performed under a command issued by a host system. A managing unit manages the number of blocks remaining unused in the replacing area. Upon reception of the command for assigning the replacing area to the defective block from the host system, the reassignment processing of the defective block from the host system, the reassignment processing of the defective block is performed, and the number of blocks remaining in the replacing area which is managed by the managing unit is supplied to the host system.

REFERENCES:
patent: 4380066 (1983-04-01), Spencer et al.
patent: 4833665 (1989-05-01), Tokumitsu et al.
patent: 5060197 (1991-10-01), Park et al.
patent: 5077736 (1991-12-01), Dunphy, Jr. et al.
patent: 5124987 (1992-06-01), Milligan et al.
patent: 5151990 (1992-09-01), Allen et al.
Section 8.1.3. of "Explanation of Reassign Blocks Command", of Japanese Version of the ANSI Standards X3. 131-1986, by the Japanese Standards Association (No English translation).

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