Magnetic media containing a half-checkered reference track for referencing the magnetic head position.

摘要

A magnetic disk having a plurality of optical servo tracks and an indelible reference track used for determining the offset distance between a magnetic read/write transducer and an optical servo head. The indelible reference track has a pitted half-checkered configuration comprised of a plurlity of units separated by spacer areas and positioned about a reference circle. Each unit comprises a first region and a second region positioned on opposite sides of said reference circle with said first region diagonally disposed to said second region. Said first and second regions are formed by embossing a plurality of pits into the magnetic layer of the floppy disk to a depth of about one micron. <IMAGE>