A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. On spin up of the disk, the processor detects a spin-up wedge associated with one of the servo wedges and then detects the servo...http://www.google.com/patents/US7206149?utm_source=gb-gplus-sharePatent US7206149 - Circuit and method for detecting a spin-up wedge and a corresponding servo wedge on spin up of a data-storage disk
