Magnetic disk-control track read through envelope

Details Magnetic disk-control track read through envelope Magnetic disk-control track read through envelope

1981-12-23

1984-01-03

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360133, G11B 5012, G11B 582

Patent

active

044245394

ABSTRACT:
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.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 23 No. 9, Feb. 1981, pp. 4032-4033, Diskette Marking, Fletcher et al.

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