Seek control apparatus and method for preventing head in a flopp

Details Seek control apparatus and method for preventing head in a flopp Seek control apparatus and method for preventing head in a flopp

1988-08-30

1990-05-08

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7811, G11B 2102

Patent

active

049243330

ABSTRACT:
A seek control device for use in a floppy disk apparatus, for performing a reverse seek operation to detect the zero track position on a magnetic disk as a reference for moving the magnetic head to a destination track on the magnetic disk. The device includes a driving section for seeking the zero track position in response to an input reverse seek instruction and for seeking a destination track position in response to an input forward seek instruction, a track zero signal generating section for generating a track zero signal when the magnetic head is on the zero track, and a seek control section. The seek control section determines if a seek error has occurred, and in response, temporarily interrupts the input seek operation, generates forward drive instructions until the track zero detection signal has been turned off, generates a reverse drive instruction to the driving section in order to seek the zero track position, and then continues with the input seek operation.

REFERENCES:
patent: 4563712 (1986-01-01), Nishio et al.
patent: 4599659 (1986-07-01), Saito et al.
patent: 4686590 (1987-08-01), Kunii et al.
Toshiba's Technical Material on Integrated Circuit FDMC-III TC8601F (JC-TC8601F-01).

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