Apparatus for recording and reading binary information on a magn

Details Apparatus for recording and reading binary information on a magn Apparatus for recording and reading binary information on a magn

1986-01-07

1987-07-28

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 555

Patent

active

046835040

ABSTRACT:
The apparatus is for recording and reading binary information on a magnetic disc (14) of rigid type, with a plurality of concentric recording tracks. Each track comprises a useful zone for storing binary information and a function zone in which information which is used for correct positioning of the head with respect to the central axis of the track is pre-recorded. Moreover, in the function zone of a predetermined track, information identifying this track as a reference track is also pre-recorded. A stepping motor (22) is adapted to position the magnetic recording and reading heads with respect to the tracks of the disc and is driven by a circuit which comprises a voltage source (51) and a voltage boosting circuit (53) which supplies the stepping motor (22) with a voltage (PA) higher than that (PW) supplied by the voltage source (51) during the presence of a command signal (RC) which is emitted by a control unit (15) during the time required to shift the heads from an existing position to a new position.

REFERENCES:
patent: 4390912 (1983-06-01), Hertrich et al.
patent: 4482851 (1984-11-01), Cantello
IBM Technical Disclosure Bulletin, vol. 22, No. 8A, Jan. 1980, pp. 3127-3130, Recording Position Signals on Record Disks, Brock et al.

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