Patent ID: 7002769

Claim:
A head control method controlling movement of a head on a discoidal recording medium on which position information is stored at radially equal spacing, a plurality of virtual tracks are formed corresponding to said position information, and a plurality of concentric zones are formed each of which includes a predetermined number of said plurality of virtual tracks, said head controlling method comprising the steps of: presetting in each of said plurality of zones a coefficient obtained by dividing a pitch of an actual track with a pitch of a virtual track, a pitch of actual tracks on which data is actually written or read being constant in each of said plurality of zones; obtaining a position of said head for reading or writing data by summing up said coefficients from the outermost or innermost virtual track, to the virtual track on which data is written or read; moving said head to a position of said position information reproducing signal corresponding to said obtained head position; and writing or reading data at the obtained head position.