Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1994-11-08
1996-03-05
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7302, G11B 1546
Patent
active
054972779
ABSTRACT:
A spindle sync control system for a plurality of magnetic disk drives connected in parallel to a host computer. The system is capable of reducing lost time and preventing a system from going down. The system includes a discriminator (25A) for discriminating the presence or absence of a reference index, a medium index and a Hall index; an offset calculator (25B) for calculating an offset value between the medium, index and Hall index before starting spindle sync control; a memory means (26) for storing the thus calculated offset value; a phase difference calculator means (25C) for calculating a phase difference between the reference index and the medium index; and a determination means (25D) for determining a driving control value for rotating a spindle motor (7) according to the thus calculated phase difference.
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IBM Technical Disclosure Bulletin, vol. 33, No. 4, Sep. 1990, New York US, pp. 356-358, "Method to Synchronize Direct Access Storage Device Spindles Using Off-The-Shelf Hardware and Digital Control Techniques. "
Fujitsu Limited
Habermehl James L.
Psitos Aristotelis
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