Mass storage disk drive defective media handling

Details Mass storage disk drive defective media handling Mass storage disk drive defective media handling

1984-06-08

1986-12-23

Atkinson, Charles E.

Excavating

364200, 360 47, G06F 1120

Patent

active

046317236

ABSTRACT:
A disk drive of a mass storage subsystem includes areas on a disk surface wherein a vendor-generated defective sector log, a software-generated defective sector log and an alternate sector log are stored. A random access memory (RAM) stores a copy of the defective sector logs. During a seek operation, firmware tests the defective sector logs in RAM to generate the alternate sector log for that cylinder number. During the read or write operation, the alternate sector log is checked before processing the sector to determine if it is a defective sector. If the sector is defective, the head is positioned to another cylinder at a head and sector address read from the alternate sector log.

REFERENCES:
patent: 3771143 (1973-11-01), Taylor
patent: 4150428 (1979-04-01), Inrig et al.
patent: 4405952 (1983-09-01), Slakmon
patent: 4434487 (1984-02-01), Rubinson et al.

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