Patent ID: 6057977
Filing Date: 2000-05-02
Classification: G11B

Abstract:
A magnetic disk for a direct access storage device, the magnetic disk having a servo pattern recorded on a surface thereof for positioning a transducer head relative to data tracks of the magnetic disk, the servo pattern comprising:a first set of servo bursts that extend generally radially across the surface of the magnetic disk, each servo burst in the first set having a width equal to that of data recorded in the data tracks and spaced apart radially from other servo bursts in the first set by a pitch equal to that of the data tracks, each servo burst in the first set having a centerline that is offset from the centerline of one of the data tracks by a first predetermined fraction of the pitch of the data tracks, the first set of servo bursts including bursts comprising transitions recorded at a first frequency radially alternating with bursts comprising transitions recorded at a second frequency; anda second set of servo bursts extending generally radially across the surface of the magnetic disk angularly offset from the first set of servo bursts, each servo burst in the second set having a width equal to that of data recorded in the data tracks, each servo burst of the second set of servo bursts spaced apart radially from other servo bursts in the second set by a pitch equal to that of the data tracks, each servo burst in the second set having a centerline that is offset from the centerline of one of the data tracks by a second predetermined fraction of the pitch of the data tracks, the second set of servo bursts including bursts comprising transitions recorded at the first frequency radially alternating with bursts comprising transitions recorded at the second frequency, the servo bursts recorded at the first frequency in the first set of servo bursts offset from the servo bursts recorded at the second frequency in the second set of servo bursts by one-half the data track pitch, and the servo bursts recorded at the second frequency in the first set of servo bursts offset from the servo bursts recorded at the first frequency in the second set of servo bursts by one-half the data track pitch.