| 摘要 |
<p>Servo information is located within one of the data sectors of a record disk and is in the form of a pattern of radially spaced-apart segments (51, 52, 53, 61, 62, 63) , each segment overlapping a number of data tracks and comprising magnetic transitions which increase in frequency with distance from the centre of the disk to provide a digital head position error signal (PES). A similar segment (31, 32, 33) is located in each of the other data sectors around the perimeter of the disk to provide track profile information so that a head positioning system can compensate for disk runout and distortion. The disk drive can include means for eliminating the effect of the amplitude of the readback signal from the servo and profile segments on the head positioning system, thus ensuring a reliable PES at all radial locations on the disk and allowing interchangeability of disks among disk drives. </p> |
