Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1979-07-10
1980-12-02
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
318561, 360 77, G11B 2108, G05B 1300
Patent
active
042375029
ABSTRACT:
A disk drive for one or more spinning disks has a voice coil motor, driving the transducer carriage and controlled by two feedback loops, respectively, for hold and seek modes and enabled by a microcomputer which is additionally inserted into the seek mode feedback loop. The microcomputer receives step pulses from a controller host as well as detent pulses through a path of that seek loop; the pulses serve as interrupts and the microcomputer selects digital speed signals on the basis of step and detect pulse counts. An a/d converter inserts that signal as command into the seek loop. The microcomputer performs basically a continuous loop type of program pursuant to which command (select) lines from the host are interrogated and the hold mode is maintained until, for example, one or more step pulses interrupt this program loop to command the drive to move the carriage to another track; the microcomputer then shifts the drive to the seek mode, which is maintained by the continuous loop until the carriage has arrived at the new position. Special subroutines cause the drive to center on a zero track when externally or internally commanded. A variety of diagnostic tests can be performed.
REFERENCES:
patent: 3699555 (1972-10-01), Duvall
patent: 3838457 (1974-09-01), Palmer
patent: 4031443 (1977-06-01), Droux et al.
patent: 4133011 (1979-01-01), Kurzweil, Jr.
Erickson, Jr. Robert W.
Stevens G. Randall
Eddleman Alfred H.
Per Sci, Inc.
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