Zone miss recovery system for disk drives using a modified const

Details Zone miss recovery system for disk drives using a modified const Zone miss recovery system for disk drives using a modified const

1993-01-04

1993-09-14

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 50, 360 7303, 360 7814, G11B 1924, G11B 2108

Patent

active

052455955

ABSTRACT:
A disk drive zone access method for recovering from a zone miss of a disk drive head(s) is used with media that has a plurality of zones each having different data recording frequencies. Data is read with a variable reference synchronizing frequency that can be set to match any one of the data recording frequencies. The method comprises 1) defining a memory space to stores zone miss history in alternative memory spaces according to the head seek direction at the time of a zone miss; 2) referencing the one zone miss history that corresponds to the present head seek direction; 3) estimating a candidate zone where the head is/are most likely to be, based on the zone miss history; 4) setting the variable reference synchronizing frequency to the data recording frequency of the candidate zone; and 5) updating zone miss history in the memory space with the present zone miss data according to the head seek direction at the time of the zone miss.

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patent: 4530018 (1985-07-01), Hoshino et al.
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patent: 4896311 (1990-01-01), Ishihara
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