Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1986-10-03
1988-04-12
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 721, G11B 1544, G11B 2722
Patent
active
047378689
ABSTRACT:
A repositioner for a streaming magnetic tape drive apparatus includes control circuitry which, when a repositioning instruction is received from an external device, supplies a drive stop instruction to a tape reel motor and a measurement start instruction to a tape travel distance measuring device when a first data block edge detection signal is reproduced from the tape within a certain time period. A tape stop detection signal is produced when forward movement of the tape ceases, and the control circuitry outputs a reverse drive instruction to the reel motor while supplying a reverse tape travel distance measurement start instruction to the distance measuring device. When the forward and reverse tape travel distances become equal and a data block edge detection signal is reproduced from the tape within a certain time period, a normal operation signal is provided to the external device to signal that a repositioning operation is normally performed. Accordingly, adjacent data blocks on the tape will not be erased, and data read access will not be started midway along an adjacent data block on the tape.
REFERENCES:
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patent: 4418367 (1983-11-01), Nagai et al.
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patent: 4628377 (1986-12-01), Harigaya
Valient, William A., IEEE Transactions on Magnetics, vol. Mag-17, No. 4, Jul., 1981, pp. 1438-1441.
Kimura Kiyosi
Komatsu Yoshikazu
Nakayama Norio
Anritsu Corporation
Cardillo Raymond F.
Robertson David L.
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