Control system for flexible disk file

G - Physics – 11 – B

Patent

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352/21.21

G11B 17/02 (2006.01) G11B 19/12 (2006.01) G11B 19/28 (2006.01) G11B 21/10 (2006.01) G11B 23/36 (2006.01) G11B 23/42 (2006.01) G11B 27/10 (2006.01) G11B 27/32 (2006.01)

Patent

CA 1180443

CONTROL SYSTEM FOR FLEXIBLE DISK FILE Abstract of the Disclosure Control information for a flexible magnetic disk storage assembly is recorded on the periphery of the disk in a region not used for recording data. The control information is read through the protective cover or envelope which encloses the disk by means of a magnetic transducer such as a four track audio cassette head which bears against the envelope. By recording index and sector pulses as part of the control information, hard sectoring can be inexpensively and accurately achieved. A recorded fixed frequency control signal can be read and used as part of the feedback loop in a phase locked oscillator used to control a d.c. motor driving the spindle. The control information can also include servo tracks which assist in registering the data transducer directly over data tracks on media which has changed its dimensions.

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