Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-07-29
1998-05-26
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7705, 360 51, G11B 5596
Patent
active
057575762
ABSTRACT:
A disk apparatus in which the position of a head is detected using servo information recorded on a recording plane of a disk. A first phase difference detecting section uses a zero-cross signal, a master clock, servo patterns corresponding to N cylinders (N is an integer equal to or greater than 2) so as to discriminate the different polarity information items contained in servo patterns from one another and to output phase difference information. A second phase difference detecting section uses the zero-cross signal, the master clock, half the servo patterns corresponding to the N cylinders so as to output phase difference information without discriminating the different polarity information items contained in the servo patterns from one another. When seek operation is performed, a selecting section outputs the phase difference information delivered from the first phase difference detecting section. When on-track control is performed, the selecting section outputs the phase difference information delivered from the second phase difference detecting section. A phase difference information integrating section integrates the phase difference information selected by the selecting section and outputs a position control signal for controlling the positioning of the head. The position signal can be demodulated accurately during/high speed seek operation of the head, without increasing complexity of the processing for the demodulation of the positional signal. The object is to make it possible to demodulate a position signal accurately during high speed seek operation of a head, without increasing complexity of the processing for the demodulation of the positional signal, thereby increasing the reliability of the disk apparatus.
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Kosugi et al., Disk Device, Patent Abstracts of Japan, Publication No. 07-28794949, Oct. 31, 1995.
Cullen Larry T.
Fujitsu Limited
Psitos Aristotelis M.
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