Automated, fault tolerant, zone sector mark generation method

Details Automated, fault tolerant, zone sector mark generation method Automated, fault tolerant, zone sector mark generation method

1993-08-17

1995-04-11

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

054064260

ABSTRACT:
The present invention includes a method, apparatus and disk format for implementation of the same to provide fault tolerant detection of ID fields for data sectors in order to eliminate errors caused by mis-alignment and mis-detection of hard sector marks. Logic is provided to initiate a time-out count at the completion of a hard sector count. The time-out count is specified to be a period of time within which a hard sector mark should be detected. If the time out count counts down and a hard sector mark is not detected, then a possible error situation arises and the fault tolerant process is initiated to compensate for the lack of detection of a hard sector mark. Thus, at the end of the time-out count, a small burst count is started. This small burst count is of a shorter duration than the original burst count utilized, but is long enough to bring the head assembly to the location in the sector at the beginning of the user data at which time the hard sector count is initiated to count down the user data locations for that hard sector. Thus, the beginning of the user data area will always be determined and errors due to ill-defined user data areas caused by mis-detection of an hard sector mark are avoided.

REFERENCES:
patent: 5276564 (1994-01-01), Hessing et al.
patent: 5278703 (1994-01-01), Rub et al.
patent: 5311376 (1994-05-01), Joan et al.
patent: 5313340 (1994-05-01), Takayama et al.

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