Method for substituting replacement tracks for defective tracks

Details Method for substituting replacement tracks for defective tracks Method for substituting replacement tracks for defective tracks

1982-09-30

1990-02-20

Shaw, Gareth D.

Boots, shoes, and leggings

360 47, 371 102, 3642481, 3642453, 3642653, 3642450, 3642670, 3642674, 3642680, 3642683, 3642685, 3642384, G06F 1120

Patent

active

049031988

ABSTRACT:
A magnetic disc unit device controlling system and method are disclosed in which a magnetic disc unit controller for selecting any one of a plurality of magnetic disc units and exchanging information between a computer and a selected disc unit is provided with a memory for storing substitute track tables indicative of substitute track positions corresponding to defective tracks in the disc units. The substitute track table is accessed prior to sending positioning instructions to the selected disc unit. If a substitute track exists, the address of the substitute track is sent to the selected disc unit as a positioning instruction. If there is no substitute track, the received positioning information is passed to the selected disc unit as a positioning instruction.

REFERENCES:
patent: 3689891 (1972-09-01), Kril
patent: 3771143 (1973-11-01), Taylor
patent: 4152695 (1979-05-01), Democrate et al.
patent: 4310901 (1982-01-01), Harding et al.
patent: 4405952 (1983-09-01), Slakmon
patent: 4434487 (1984-02-01), Rubinson et al.
patent: 4498146 (1985-02-01), Martinez
"800 MB/Spindle Magnetic Disk Storage System," Yonosuka Ito, et al., Japan Telecom. Review, Jan. 1980.
"Increased Direct-Access Storage Device Yield Through Defective Track Handling in Hardware," IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981.
"Track Selection in Rotating Medium Stores," C. E. Owens, IBM Technical Disclosure Bulletin, vol. 12, No. 12, May 1970.
"Translator Smooths Integration of Disk Drives and Systems," Electronic Design, vol. 28, Oct. 1980.
Decision by European Patent Office denying the opposition.

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