Servo patterns for bit patterned media with multiple dots per servo period

摘要

A servo control field on a recordable medium includes a bit patterned media (BPM) pattern including a plurality of dots arranged in a down-track orientation and in a cross-track orientation, wherein the dots comprise a plurality of dot composites. Each of the dot composites includes a plurality of dots. A first spacing between adjacent ones of the plurality of dots in a dot composite in the down-track direction on the recordable medium is less than a second spacing between adjacent ones of the plurality of dot composites in the down-track direction. A readback signal generated in response to the BPM patterned may be filtered to attenuate harmonic frequencies in the readback signal.

主权项

1. A recordable medium, comprising:
a servo control field comprising a bit patterned media (BPM) pattern including a plurality of dots arranged in a down-track orientation and in a cross-track orientation, wherein the dots comprise a plurality of dot composites, each of the dot composites including a plurality of dots, and wherein a first spacing between adjacent ones of the plurality of dots in a dot composite in the down-track direction is less than a second spacing between adjacent ones of the plurality of dot composites in the down-track direction.