Automatic disk change detection without causing head movement by

Details Automatic disk change detection without causing head movement by Automatic disk change detection without causing head movement by

1994-06-21

1996-08-20

Kim, Ken S.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 53, 395835, 395836, 395837, 395839, G06F 1130

Patent

active

055487840

ABSTRACT:
A method and apparatus for detecting diskette change is provided. A step pulse signal generated using the CPU is sent to the step pulse line of the disk drive, in addition to the normal step pulse signal which can be issued from the floppy disk controller. Thus, a step pulse can be issued directly by the CPU without using the FDC. By positioning the head in the outmost cylinder and issuing a step pulse, at a time when the direction signal indicates outward direction, the door-open status signal can be updated, without causing movement of the head. By preventing head movement in response to a step pulse, door-open status information is updated without undesirable effects of excessive head movement, drive spinning, head movement noise, constant illumination of the drive light or unnecessarily occupying the CPU or other components.

REFERENCES:
patent: 4086659 (1978-04-01), Cizmic et al.
patent: 4357657 (1982-11-01), Fellinger
patent: 4870613 (1989-09-01), Clinkenbeard et al.
patent: 5239426 (1993-08-01), Sakaegi

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