Disk drive control unit having sets of operating command and operation length information and generating end signal based upon operation length information

摘要

A disk control unit for writing data on or reading the same from a disk in a disk apparatus in response to an instruction from a host computer. The disk control unit has a plurality of command buffers for storing a group of operation information and operation length information corresponding to individual fields in the disk format of the disk apparatus. Prior to processing the length information is set in a counter and then is counted decrementally with progress of the processing steps, whereby an operation end signal is produced to control an address generator for the command buffers. The disk control unit also has a pointer register for storing a jump point address in response to indication of the operation information and outputting the stored address in response to indication of the other operation information to change the address of the address generator. The disk control unit further has a plurality of ID field registers for indiscriminately storing the ID field registers forindiscriminately storing the ID field address marks and the ID information in the disk format of the disk apparatus.