Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1997-03-05
1999-07-13
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 53, 360 54, G11B 2736
Patent
active
059234857
ABSTRACT:
A time counting device, a cache memory and a copy control circuit are added to a conventional disk drive so that recorded information is copied periodically and automatically. Alternatively, a cache memory, a copy control circuit, a reference control circuit, a first time counting device and a second time counting device are added to the conventional disk drive so that information which remains recorded for a predetermined period of time after its last recording date is automatically copied. According to another embodiment, a reference signal is recorded in advance and a reproduced output is periodically measured. If the reproduced output is lower than a reference value, recorded information is automatically copied. According to yet another embodiment, the temperature in the disk drive is measured by a thermometer 18, and if the temperature is higher than a reference value, information is automatically copied at shorter intervals than when the temperature is less than the reference value. Other embodiments are also disclosed with the aim of ensuring that information recorded on a magnetic media can always be reproduced reliably, even in the case of high density recording.
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Faber Alan
Hitachi , Ltd.
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