Magnetic disk apparatus comprising means for changing a sector p

Details Magnetic disk apparatus comprising means for changing a sector p Magnetic disk apparatus comprising means for changing a sector p

1993-12-23

1995-12-26

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 27, 360 7705, G11B 502, G11B 509, G11B 5596

Patent

active

054793017

ABSTRACT:
A magnetic disk apparatus including a head disk assembly, a servo control circuit, a head positioning microprocessor, a sector pulse generating circuit, a head selection circuit, and a main controller. The head selection circuit selects any one of disk media in a data read/write operation. The servo control circuit controls an operation of a head positioning motor. The head positioning microprocessor controls an operation of the servo control circuit based on an external command. The sector pulse generating circuit has a plurality of sector counters for counting a clock signal and generating sector pulses having different periods, selects one of the sector pulses from the sector counters based on an input selection signal, and outputs the selected sector pulse always with a predetermined separation or longer. The main controller controls an information write/read operation through the head selection circuit based on the sector pulse output from the sector pulse generating circuit, and outputs a selection signal to the sector pulse generating circuit, thereby performing switching control of the sector pulse.

REFERENCES:
patent: 5068755 (1991-11-01), Hamilton et al.
patent: 5270885 (1993-12-01), Satoh et al.
patent: 5276564 (1994-01-01), Hessing et al.
patent: 5307218 (1994-04-01), Kitamura et al.

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