Header verification in a disk drive using sector histories for i

Details Header verification in a disk drive using sector histories for i Header verification in a disk drive using sector histories for i

1994-04-05

1996-10-22

Shah, Alpesh M.

Excavating

371 401, 360 722, 3642362, 3642531, 3642683, 364DIG1, G06F 1200

Patent

active

055686273

ABSTRACT:
A technique for verifying a pre-recorded header in a disk drive uses verification history to protect against errors that can cause verification failure. A head number, sector address, and upper track address (track MSB) are read from the disk and compared with corresponding expected values. The results of the 5 most recent comparisons are saved in three 5-bit memories. During each verification, a programmable selection and comparison circuit selects M of the stored indicators and determines whether at least N of them indicate a match. If so, the corresponding field is declared to be correctly verified, so that subsequent reads or writes to data blocks within the corresponding sector are allowed to proceed.

REFERENCES:
patent: Re34003 (1992-07-01), Weng
patent: 4949200 (1990-08-01), Weng
patent: 5036408 (1991-07-01), Leis et al.
patent: 5241521 (1993-08-01), Shigemori
patent: 5268798 (1993-12-01), Shinn
patent: 5268803 (1993-12-01), Sugita et al.
patent: 5274509 (1993-12-01), Buch
patent: 5432762 (1995-07-01), Kubo et al.

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