A disk drive is disclosed comprising a disk and a head actuated over the disk. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval. A first spiral track comprises a first sync mark from an outer...http://www.google.fr/patents/US7839591?utm_source=gb-gplus-shareBrevet US7839591 - Disk drive comprising index spiral track identified by change in sync mark
Disk drive comprising index spiral track identified by change in sync mark
