A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording...http://www.google.fr/patents/US6452990?utm_source=gb-gplus-shareBrevet US6452990 - Synchronous detection of wide bi-phase coded servo information for disk drive
Synchronous detection of wide bi-phase coded servo information for disk drive
