Defect skipping mechanism for disk drives

Details Defect skipping mechanism for disk drives Defect skipping mechanism for disk drives

1987-07-24

1989-03-07

Faber, Alan

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

369 59, 369 54, G11B 2700, G11B 2012

Patent

active

048111244

ABSTRACT:
A novel technique for skipping defects on a magnetic or writable optical disk is described. The technique includes a sector format comprising a header (24) and data area (28), wherein the data area can include one or more "bad areas" (108, 116) which will be skipped when data is being written to or read from the sector. The bad areas are variable in size and may be located anywhere in the data area, including in an EDAC. The header includes a defect descriptor (48) comprising a defect pointer (70, 72) for each of the bad areas supported. Each defect pointer contains a value (74, 78) indicating the number of bytes in the good data area (106, 114) preceding the bad area pointed to by the defect pointer, and a value (76, 80) indicating the number of bytes in the bad area. The value indicating the number of bytes in a good area is set to a value indicating a number of bytes at least as large as the sector size if there is no subsequent bad area in the data area.

REFERENCES:
patent: 4549295 (1985-10-01), Parvis
patent: 4736352 (1988-04-01), Satoh et al.
Magnetic Peripherals, Inc., "Preliminary Product Specification for 97704 Intelligent Hydra Drive," Document No. 64401500 (Rev. 1, Mar. 1986), pp. 55-63, 73-74.
Published Technolgy No. 81-1680, Tokyo Shibauro Denki K.K., Shigera Satoke, Apr. 20, 1981.

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