A method of making a disc for a computer disc drive and a disc made in
accordance with the same. The disc includes a deposited magnetic layer of
a thin film medium over a disc-shaped substrate. A master pattern having
a plurality of tracks is recorded on the disc. Each track on the disc
includes a plurality of magnetic islands, each having a size and magnetic
properties. The size and/or magnetic properties of one or more of the
magnetic islands of each track are modulated such that each track has a
modulation frequency, so as to imprint a magnetic topology on the disc.
The modulation frequency of each track is either a fundamental frequency
or an overtone of the fundamental frequency.