Initial Track Acquisition for a Disk File
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
When a disk file is initially powered up, Track 0 is acquired by using servo position error information written in the guard band firstly to position the head over the nearest track of the same type as Track 0. If this track is not Track 0, controlled steps of a fixed number of tracks at a time are performed until the Track Identifier (ID) of Track 0 is read. Normally, on power up, the read/write head is positioned at a limit of its movement, as defined by the physical abutment of the head actuator with an end stop. For a file employing servo head positioning, this means that the head will be within a guard band, i.e., a region of the disk which is not available for data recording and which is distinguishable from the data area.