Magnetic disk unit and method for controlling the same

Details Magnetic disk unit and method for controlling the same Magnetic disk unit and method for controlling the same

1995-04-03

1996-11-26

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, G11B 502

Patent

active

055791867

ABSTRACT:
In an idle state, servo information from all sectors is not used, but the servo information from every other sector or from every three or more sectors is used so that head positioning can be performed with only a minimum amount of servo information. The power to the electric circuitry of a write or read system and a servo system, which is not needed in the idle state, is interrupted, from the arrival of the selected servo information to the arrival of the next selected servo information, by a power control signal generated in accordance with the timing of the sectors. The power consumption can be reduced by the amount corresponding to turning off the circuitry not needed, plus the amount needed for computing for position control.

REFERENCES:
patent: 4737867 (1988-04-01), Ishikawa et al.
patent: 5140571 (1992-08-01), Nishida et al.
patent: 5321560 (1994-06-01), Cowen
patent: 5345347 (1994-09-01), Hopkins et al.
Bob McKnight, "A Track Locating Servo System Utilizing the Data Heads as Absolute Position Transducers," IEEE Transactions on Magnetics, vol. MAG-14, No. 4, Jul. 1978 pp. 182-184.
IBM Technical Disclosure Bulletin, vol. 32, No. 12, May 1990, entitled "Dead-Beat Servo Control By Interleaved Sampling for Hard Disk Drive".

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