Processing System for Position Error Signal From Quadrature Servo Pattern in Disk Files
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
In magnetic recording disk files, the read/write head attached to the actuator is positioned to the desired data track and maintained over the track through the use of a servo control system. The servo information for positioning the head is obtained from a dedicated servo disk located among the stack of disks in the disk file or from sectors of servo data interspersed around the surface of the data disk. The specific pattern of servo information located in the servo tracks on the servo disk or in the servo track sectors of the data disk can be a conventional type of quadrature pattern, such as is described in the IBM Technical Disclosure Bulletin 21, 804-805 (July 1978).