Method for high speed positional control of a transducer for rotating

Abstract

A transducer position control method suitable for practice with a magnetic disk of the kind wherein the data tracks are divided into a plurality of groups, each group of tracks being individually identified by the same set of address code characters prerecorded thereon for the simplicity of the address code. As the transducer travels at controlled speed from a departure track to a destination track, reading the address code characters on the successive tracks being traversed, the address code characters are sampled at regular intervals. The transducer may skip over one complete track group during each sampling interval as the seek speed is made higher than heretofore. Therefore, each time an address code sample is obtained, the actual rate of transducer moving during the previous sampling interval is compared with an expected rate of transducer movement for the same sampling interval in order to determine the current transducer position and the remaining number of tracks to the destination track.