| 摘要 |
PURPOSE:To perform the positioning of an address corresponding to a designated sector in a short time, by making a pair of the sector value of a track on a magnetic disk and the address on a cache memory corresponding to the sector value, and storing it at every access. CONSTITUTION:When a set sector command is supplied, its sector value St is stored in the register 41 of a data memory 4. Next, the sector value (m) and a memory address P at a preceding access time are read out from the prefix part of the track corresponding to the St of the cache memory 1, and are set at registers 42 and 43 respectively. And the St is compared with the (m) at an arithmetic circuit 7 and a decision circuit 8, and by setting the P when it is St>=m, and the leading record address of each track when it is St<m, as the start point of address calculation corresponding to the St, and finding the sector value from each record in order, the positioning of the address on the cache memory 1 corresponding to the St is performed.
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