Method and apparatus adopting a data surface servo method in whi

Details Method and apparatus adopting a data surface servo method in whi Method and apparatus adopting a data surface servo method in whi

1997-01-15

1998-09-08

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 48, G11B 509

Patent

active

058053689

ABSTRACT:
In a magnetic disk apparatus adopting a data surface servo method, and an improved data surface servo method for the magnetic disk apparatus, a Gray code sector number is included in a Gray code region, and a servo zone counter is controlled to start its counting operation after the unquestionableness and the continuity of the Gray code sector number are confirmed. Therefore, it becomes possible to detect a rotational position of the disk in real time, and also possible to discriminate which of the fault of the servo zone counter and a misreading of the Gray code sector number is a trouble. Thus, reliability in detection of a rotational position of a magnetic disk is improved. By comparing the Gray code sector number with the servo zone number signal outputted from the servo zone counter, it is possible to detect the fault of the servo zone counter, and therefore, it is possible to prevent the writing operation based on an erroneous detection of the rotational position, thereby to avoid a data destroy.

REFERENCES:
patent: 5438559 (1995-08-01), Best et al.
patent: 5627695 (1997-05-01), Prins et al.
patent: 5666238 (1997-09-01), Igari et al.

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