Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-04-17
1986-12-09
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, 318561, G11B 2108
Patent
active
046283803
ABSTRACT:
A head positioning system for a magnetic disk memory to position the head over a reference track so that track seeking operations can proceed from a known reference location. A plurality of control tracks are recorded adjacent the reference track with the first control track having a first type of control signal recorded thereon and the remainder having a second type of control signal. Means are provided to move the head a sub-multiple of the track spacing is to establish the head as close as possible to the centerline of the track, and to thereafter move the head integral multiples of the track spacing toward the reference track. The head is moved sequentially over the control tracks until the first type of control signal is detected. One more step then positions the head over the reference track. The sub-multiple movement capability is achieved through the use of a position encoder having a polyphase output, movement between zero crossings of the polyphase outputs being said submultiple. Selection of the optimal phase positions the head as close as possible to tracks centerline, and once chosen, the optimal phase is used in track seeking operations until a disturbing event or shut down and start up.
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IBM TDB vol. 19, No. 4 "Head-to-Track Synchronizing Mechanism for Magnetic Disks" Porter et al., 9/76, pp. 1393-1395.
Cardillo Raymond F.
Computer Memories, Inc.
Garland Steven R.
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