Patent ID: 7848048

Claim:
A magnetic recording disk drive comprising: a rotatable magnetic recording disk having a plurality of generally circular data tracks, a plurality of angularly spaced synchronization marks extending generally radially across the data tracks, and a plurality of angularly spaced servo sectors extending generally radially across the data tracks, each data track patterned into discrete magnetizable data islands; a read head for sensing the synchronization marks and the servo sectors; a write head for writing data to the data tracks by generating a magnetic write field to magnetize the data islands in the data tracks; a head carrier supporting the read head and write head; a rotary actuator connected to the head carrier for moving the read head and write head generally radially across the data tracks; a controller for selecting a data track where data is to be written by the write head; a write clock coupled to the write head for controlling reversals of the magnetic write field to the data islands in the selected data track; servo electronics coupled to the read head for generating a head position error signal (PES) in response to servo sectors detected by the read head, the PES representing track misregistration (TMR) of the write head from the centerline of the selected data track; synchronization mark detection circuitry coupled to the read head for controlling the write clock in response to synchronization marks detected by the read head; and phase adjustment circuitry for adjusting the phase of the write clock in response to the PES to thereby correct for TMR of the write head.