Disk drive incorporating read-verify after write method

Details Disk drive incorporating read-verify after write method Disk drive incorporating read-verify after write method

1997-07-25

1999-08-24

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

G06F 1100

Patent

active

059419989

ABSTRACT:
A method for verifying data written to a magnetic disk in a disk drive recording system incorporates a read-verify after write ("RVaW") procedure. For each Write command issued to the disk drive, a disk drive controller will ensure that the written data can be read back and verified successfully, before informing a host computer that the Write command is complete and the drive is ready to receive another command. If a pre-determined number of verification cycles does not result in a successful read-verify, then it is assumed that the physical location of the sector or sectors in error is permanently corrupted, and an attempt is then made to rewrite the data to spare sectors.

REFERENCES:
patent: 4410942 (1983-10-01), Milligan et al.
patent: 4435762 (1984-03-01), Milligan et al.
patent: 5319504 (1994-06-01), Shih

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