Dynamic magnetic information storage or retrieval – Miscellaneous
Patent
1991-06-18
1993-06-08
Gensler, Paul
Dynamic magnetic information storage or retrieval
Miscellaneous
360 68, 360 69, G11B 502
Patent
active
052185044
ABSTRACT:
A disc-drive apparatus includes a writing unit responsive to a head select signal fed from a host controller, for selecting one of a plurality of heads to write write data into a medium, a power supply voltage generating unit for generating at least one power supply voltage, a unit for monitoring the power supply voltage fed to the writing unit and, upon detecting an abnormality of the monitored power supply voltage, outputting a reset signal, and a latching unit for retaining the head select signal to be fed to the writing unit. Upon receipt of the reset signal, the latching unit prohibits a latching and switching operation to be carried out by a subsequent head select signal fed from the host controller and maintains an output state of the retained head select signal, while the power supply voltage generating unit stops a supply of the power supply voltage to the writing unit. As a result, it is possible to prevent data in the medium from being destroyed due to a change or re-writing thereof by a malfunction of head selection operation occurring during a transient state of a lowering of the power supply voltage, or the like.
REFERENCES:
patent: 4636905 (1987-01-01), Morimoto et al.
patent: 4689698 (1987-08-01), Ishikawa et al.
Fujitsu Limited
Gensler Paul
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