CONTROL SYSTEM FOR DISK SYSTEM WITH MIXED SECTOR LENGTH

PURPOSE:To make the correcting manday of software and an application program unnecessary by absorbing the different in a sector length with a disk cache memory. CONSTITUTION:When a disk cache control device 3 recognizes a magnetic disk device a magnetic disk having a different sector length based on the instruction of an instructing means 13 and writes a data block for a magnetic disk device having a large sector length, since the block is rewritten to the magnetic disk device after only a part needed by the said data block is rewritten on a disk cache memory 4, the erasing of the data due to the partial writing is prevented. Even in a virtual memory system, since the data block is transferred to the buffer area of a main memory 2 from the disk cache memory 4, it is not necessary to change the software and correct, etc., an application program prepared by a user regardless of the input output action of a magnetic disk device side.