A self-synchronizing servo control system and its associated servo data code for use in a high-density disk memory is disclosed. The servo data is formatted into a sync/index zone and a data zone. Sync and index di-bits are written only in the sync/index zone, while only servo data position di-bits are...http://www.google.com/patents/US4987355?utm_source=gb-gplus-sharePatent US4987355 - Self-synchronizing servo control system and servo data code for high density disk drives
