Disk File Servo for Rotary Actuator
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Use of a dedicated servo surface within a disk pack runs into limitations as recording track density is increased due to uneven thermal expansion between disks and mechanical tolerances within the stack. As a result, techniques like sector (sampled) servoing and buried layer servos have been used to move the servo information directly to the data disk without using large areas of surface which could be used for data. The present technique provides continuous dedicated servo information with a minimum use of recording area and can use existing dedicated servo circuits for track counting and servo-controlled track following.