| 摘要 |
PURPOSE:To perform read and write efficiently in a high speed by constituting a disc cache memory with respective disc areas of a semiconductor and a cache and setting both areas dynamically in accordance with the indication from a CPU. CONSTITUTION:A disc controller 2 is connected to plural CPUs 1 and plural magnetic disc drives 3 through ports 6 and 5, and the controller 2 is provided with memory areas 7 and 8 for a cache disc and a semiconductor disc. The controller 2 starts the operation in the cache disc mode in the initial state, and thereafter, teach CPU1 indicates a magnetic disc drive number, its logical address, and the use size to the controller 2 and divides the memory area into a semiconductor disc area and a cache disc area and transfers contents in a designated area in the drive 3 to the semiconductor disc area.
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