Floppy disk control apparatus

Details Floppy disk control apparatus Floppy disk control apparatus

1984-06-14

1987-02-17

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

360 48, G11B 509

Patent

active

046444181

ABSTRACT:
When a FORMAT COMMAND is executed, a track density data indicating a track density of 96 TPI or 48 TPI is written into a discrimination area of a disk. When the disk is set into the FDD and is used, a CPU reads out track density data from the disk and produces a flag byte data, including the track density data, and stores it into a main memory. When SEEK COMMAND is executed, a track density of the disk is checked to see if it is 96 TPI or 48 TPI on the basis of the flag byte data. If it is determined that the disk of 48 TPI is set into the FDD for use in driving a disk of 96 TPI according to this discrimination, an FDC outputs a STEP signal for allowing the traveling distance of the head to be doubled as compared to an ordinary distance, thereby controlling the seeking operation by the FDD so as to assuredly move the head to a predetermined desired track.

REFERENCES:
patent: 4272793 (1981-06-01), Van Landingham
patent: 4298897 (1981-11-01), Arter et al.

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