Patent ID: 6775081
Filing Date: 2004-08-10
Classification: G11B

Abstract:
A rotating magnetic disk drive data storage device, comprising:a disk drive base; a rotatably mounted disk and spindle assembly, said disk and spindle assembly comprising at least one rigid disk for recording magnetically encoded data on at least one surface of said at least one rigid disk; a movable actuator supporting at least one transducer head, said actuator positioning said at least one transducer head to access said magnetically encoded data on said at least one surface of said at least one rotatably mounted disk; a plurality of angularly spaced servo sectors recorded on said at least one surface of said at least one rigid disk, each servo sector of said plurality of servo sector being of a respective type, there being at least one servo sector of each type, wherein a servo sector of a first type contains a track identifying field of a first type, said track identifying field of a first type uniquely identifying a track of a first range of tracks, and a servo sector of a second type contains a track identifying field of a second type, said track identifying field of a second type uniquely identifying a track of a second range of tracks, said second range of tracks being less than said first range of tracks, wherein said track identifying field of said first type is a complete identifier for specifically identifying a track, and wherein said track identifying field of said second type is an incomplete identifier that partially identifies a track, and wherein servo sectors of said first type are recorded in each track at intervals of N servo sectors, wherein N>1, the total number of servo sectors in each track being an integral multiple of N, and wherein each servo sector other than sectors recorded at intervals of N servo sectors is a servo sector of said second type; and a servo system which determines track identity using said plurality of angularly spaced servo sectors.