Patent ID: 6760184
Filing Date: 2004-07-06
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, the first set of servo bursts including a repeating sequence of bursts comprising transitions recorded at respective first, second, and third frequencies; and a 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 and spaced apart radially from other servo bursts in the second set, the second set of servo bursts including a repeating sequence of bursts comprising transitions recorded at the respective first, second, and third frequencies, the servo bursts of the first and second sets of equal frequency offset from one another by a predefined fraction of the data track pitch, wherein the predefined fraction is one-third of the data track pitch.