Dynamic magnetic information storage or retrieval – Record medium – Tape
Patent
1974-03-14
1976-01-13
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Record medium
Tape
360 49, 360 51, 360 52, 360 70, 360 72, 360 84, 360101, G11B 578, G11B 2104, G11B 2336, G11B 2340
Patent
active
039328945
ABSTRACT:
An elongated magnetic tape has a pair of longitudinally extending servo track areas, one of which is closer to the longitudinal center of the tape than the other. The lateral space intermediate the servo areas receives data signals, while the space between said one servo area and one edge contains identification and address signals. The tape is particularly adapted for use with rotating head recorders having two gaps on the rotor, with an intergap distance slightly greater than the lateral extent of the servo areas. A recording or write gap precedes an immediately trailing reading or recovery gap. When the rotor gaps pass the one edge in the one servo area, the write gap senses the servo track; while the read gap senses the identification signals. The arrangement is such that prior to the time the write gap reaches the data recording area, the read gap has sensed the identification signals. In a similar manner, when the gaps are leaving the data signal area, the write gap is sensing the other servo area; while the read gap is still sensing data. The longitudinal extent of the servo areas indicates, respectively, beginning of tape (BOT) and end of tape (EOT). A leader portion includes a magnetic coating for facilitating calibrating magnetic recording apparatus to each particular article.
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patent: 3838453 (1974-04-01), Buslik et al.
Arter Nelson K.
Eichhorn Thomas F.
Kalthoff Clement H.
Cardillo, Jr. Raymond F.
International Business Machines - Corporation
Somermeyer Herbert F.
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