Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1995-07-19
1998-10-27
Le, Dieu-Minh
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
711 4, 711162, 711217, 711218, G06F 1108, G06F 1120, G06F 1202
Patent
active
058288201
ABSTRACT:
There is provided by the present invention a mirror disk device, in which specific numbers identical to those written in disks and name of a drive used as for a master disk are recorded in a set-up memory incorporated therein, this data is compared to a specific number written in a disk to determine a master disk or to transfer data to a slave disk. In the mirror disk according to the present invention, ranges of specific numbers are discretely defined without any conflict according to switching positions of a rotary switch. A first specific number is decided within each of the ranges by a random function and then serial numbers subsequent to the first specific number are assigned as specific numbers. With this feature, it is possible to prevent effective data from being lost due to, for instance, instruction miss because of manual operation.
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Miwa Yuji
Onishi Sakuyuki
Le Dieu-Minh
Mitsubishi Denki & Kabushiki Kaisha
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