Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1989-07-31
1991-09-17
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4428, 369 54, 360 7806, G11B 7085
Patent
active
050501461
ABSTRACT:
At the conclusion of a track seek operation, handoff to track following servo control is delayed for a short time period during which the drive microprocessor determines if the head has failed to stop at the target track by sensing the occurrence of a predetermined number of track crossing pulses, the detection of which causes iterative generation and application of braking current pulses to the head actuator motor. The amplitude and duration of each braking current pulse is chosen to cause forward motion of the head to be retarded to a predetermined percent of its pre-existing velocity. The microprocessor routine includes provision for iteratively determining when the head has slowed to a velocity which allows the track following servo to acquire control of the head. Once stopped on a track, a short seek is executed to return the head to the desired target track. Provision is also made in the microprocessor routine to iteratively determine direction of head movement to complement the polarity of the braking current pulse in the event a previous pulse has reversed the direction of head movement thus assuring that the braking current pulses always result in retarding forward motion of the head.
REFERENCES:
patent: 4544968 (1985-10-01), Anderson et al.
patent: 4547822 (1985-10-01), Brown
patent: 4592035 (1986-05-01), Miyasho
patent: 4931889 (1990-06-01), Osafune
patent: 4955011 (1990-09-01), Baba
Kuklewicz John C.
Richgels Jerome F.
Envall Jr. Roy N.
Literal Corporation
Young W. R.
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