Abstract: A method and apparatus for detecting sector servo information in a disk system, uses sector servo information with at least one auxiliary confirming code pattern provided in addition to conventionally-used sector mark, track address and servo position information. Generation of a group of timing signals to detect a selected portion of the sector servo information, is adjusted by detecting the auxiliary confirming code pattern so that the timing signal is synchronized with the selected portion of the sector servo information In another embodiment, synchronization is performed using a predetermined number which is loaded into a counter circuit when the auxiliary confirming code pattern is detected.

Abstract: An improved track access control system for a magnetic disk apparatus connectable to a variety of host controllers without any change thereto, and capable of an offset correction. A control unit in the disk apparatus controlling a moving unit to access a magnetic head at a desired track on the magnetic disk in response to a seek command from a host controller and using an offset correction value which is previously obtained by accessing the magnetic head at a track storing the fine positioning information, and carrying out an offset correction, includes a timer to which a time to be offset-updated within a predetermined timing is set.