Boots – shoes – and leggings
Patent
1982-07-30
1985-02-05
Zache, Raulfe B.
Boots, shoes, and leggings
G06F 1300
Patent
active
044981465
ABSTRACT:
Disclosed is a method and apparatus for avoiding accessing of defective locations in disks and other storage media. A disk file controller uses manufacturer-provided information about the location of defects to construct a sequentially ordered list of addresses of defective storage locations in the disk, and the list is stored in a table in the disk. During use of the disk, the disk file controller reads the table of defects into its memory and uses it to translate virtual addresses into real addresses. The translation process skips over real addresses of defective locations. The virtual address is translated into a real address by being incremented by the number of defects whose addresses are lower than the real address. Subsequent contiguous virtual addresses are translated into real addresses by being incremented by the number of contiguous defective locations that follow the location associated with the preceding virtual address. Addresses of new defects found during use of the disk are stored by the disk file controller in temporary storage on the disk and are incorporated into the defect table when the disk is taken out of service.
REFERENCES:
patent: 3331058 (1967-07-01), Perkins
patent: 3771143 (1973-11-01), Taylor
patent: 3949380 (1976-04-01), Barbour
patent: 3983537 (1976-09-01), Parsons et al.
patent: 4051354 (1977-09-01), Choate
patent: 4051460 (1977-09-01), Yamada et al.
patent: 4310901 (1982-01-01), Harding et al.
patent: 4346459 (1982-08-01), Sud et al.
patent: 4380066 (1983-04-01), Spencer et al.
patent: 4405952 (1983-09-01), Slakmon
patent: 4420807 (1983-12-01), Nolta et al.
IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, New York (US), Sakalay: "Address Skip--A Means for Utilizing Imperfect Storage", pp. 1841-1842.
IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981, New York (US), A. Ganguly and B. Spaeth: "Increased Direct-Access Storage Device Yield through Defective Track Handling in Hardware", pp. 625-627.
IBM Technical Disclosure Bulletin, vol. 12, No. 9, Feb. 1970, New York (US), Smith: "Substitute Memory Location Assignment for Faulty Locations", pp. 1441-1442.
IBM Technical Disclosure Bulletin, vol. 17, No. 10, Mar. 1975, New York (US), R. Abrahamsen: "Dynamic Redundancy and Repair System for Large Mass Storage Unit", pp. 2841-2843.
AT&T Bell Laboratories
Visserman P.
Volejnicek D.
Zache Raulfe B.
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