Write protect control circuit for computer hard disc systems

Details Write protect control circuit for computer hard disc systems Write protect control circuit for computer hard disc systems

1989-02-02

1990-09-11

Clark, David L.

Boots, shoes, and leggings

360 60, 360 69, G06F 1312

Patent

active

RE0333280

ABSTRACT:
A write protect system prevents inadvertent attempts to write data into a permanent memory storage device (such as a disc drive) containing valuable data that might be destroyed by such a write attempt. The write protect system includes a controller coupled to at least one memory storage device via information transfer busses and a control data bus. The controller sends signals for writing data into selected ones of memory devices. A circuit is coupled into the control data bus for monitoring signals transmitted thereover. Responsive to the monitoring circuit, access is barred to preclude writing into a specific one of the memory devices whereby data may not be accidentially written into the specific memory. The barring is cancelled if a specific action is taken whereby data may be deliberately written into a specific memory.

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Hardware Maintenance Manual, vol. 2, published by Control Data Corporation, in Jan., 1984, in the U.S., pp. i, ii, 1-1, 1-2, 1-22 through 1-30.

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