Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-04-06
1991-08-13
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7707, 360 7813, 318696, G11B 5596
Patent
active
050400843
ABSTRACT:
Method and apparatus is provided for writing and reading data from a rotatable disk. Utilizing the apparatus of the present invention, the method includes the steps of formatting the disk with a plurality of spaced apart generally circular servo tracks with data tracks disposed therebetween. A servo signal is recorded on the servo tracks and one embodiment of the invention the position of adjacent data tracks is determined from the position of the servo track on an open loop basis. No embedded servo tracks are utilized in the present invention, nor is there a need for closed loop servo system. The apparatus includes a stepper motor for causing movement of an electromagnetic head relative to the rotatable disk and circuit means for generating three phased voltage pulses for driving the stepper motor with a second of the three phased voltage pulses being of an opposite phase than a first and third of said three pulses.
REFERENCES:
patent: 4241434 (1980-12-01), Shida et al.
patent: 4530020 (1985-07-01), Sutton
patent: 4675756 (1987-06-01), Saitoh et al.
IBM TDB, vol. 19, No. 6, "Self Calibrating Disk Storage Apparatus", Griffiths et al., 11/76, pp. 1991-1992.
Canney Vincent P.
Digisys Corporation
Garland Steven R.
Hackler Walter A.
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