Patent ID: 7023637
Filing Date: 2006-04-04
Classification: G11B

Abstract:
1. A disk drive having a sampled servo system controller, a head including a read transducer and a write transducer and a disk having a plurality of servo burst fields, the plurality of servo burst fields comprising: a first normal burst field; a first quadrature burst field, a portion of the first quadrature burst field being circumferentially contiguous with the first normal burst field and spanning a portion of a radial extent of the first normal burst field; a second normal burst field, the second normal burst field being radially aligned with and away from the first normal burst field, the second normal burst field spanning a portion of a radial extent of the first quadrature burst field; a second quadrature burst field, the second quadrature burst field being radially aligned with and away from the first quadrature burst field, the second quadrature burst field spanning a portion of a radial extent of the second normal burst field, the first normal burst field and the first quadrature burst field having a same first phase, the second normal burst field and the second quadrature burst field having a same second phase, the first phase being different than the second phase; wherein when the disk drive positions the head in a track following mode for writing, the read transducer is disposed over an about equal and non-zero amount of the first normal burst field and first quadrature field or over an about equal and non-zero amount of the second normal burst field and second quadrature field.