Patent ID: 6587293
Filing Date: 2003-07-01
Classification: G11B

Abstract:
A method by steps comprising:(a) spinning a disc at a first selected rotational speed; (b) writing a clock track on the disc at the first selected rotational speed; (c) spinning the disc at a second rotational speed substantially distinct from the first selected rotational speed; (d) producing a clock signal from the written clock track pattern written on the disc while the disc rotates at the second rotational speed; (e) generating a servo pattern with a pattern generator clocked to the clock signal, wherein the pattern generator clocks out the servo pattern for writing the servo pattern to the disc at a correct timing substantially synchronized to the clock signal; and (f) writing the servo pattern to the disc at the correct timing relative to the clock signal while the disc rotates at the second rotational speed substantially distinct from the first selected rotational speed.