Magnetic disc unit with range of gap between disc and shroud

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record

Reexamination Certificate

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Reexamination Certificate

active

07072141

ABSTRACT:
A magnetic disc unit having a rotating disc type magnetic disc, a head for recording and reproducing data to and from the magnetic disc, and a shroud surrounding an end surface of an outer periphery of the magnetic disc, except a part where a carriage arm is inserted, wherein a gap between the outer peripheral end surface of the magnetic disc and the shroud is set in a range which is greater than 0.1 mm but not greater than 0.6 mm.

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“Shrouded Flexible-Disk Pack”, F. E. Talke, IBM Technical Disclosure Bulletin, vol. 19, No. 5, Oct. 1976.
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Aerodynamic Aspects of Disk Files, Lennemann, Nov. 1974, pp. 480-488.

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