Disc File Controlled by Multiplexed Servo Samples
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
In a multiple-head disc file, the actuator arm is controlled by a sampled servo system. Servo bursts are recorded on each track in positions that allow them to be read in sequence by switching between the heads. This reduces total space occupied by servo information and increases data recording space and format flexibility. The servo information assists the following tasks: a) Counting tracks crossed during arm motion (Seeks). b) Maintaining position on track while the arm is 'stationary' despite various deviations of the spindle and disk motion. c) Making adjustment to the mean track position to compensate for differences between heads. d) Giving a timing reference from which the approximate start of data can be recognized.