High servo sampling disk drive with minimum overhead

A method of more frequent servo sampling to improve shock performance while track following in a disk drive having a transducer and a disk with a plurality of concentric tracks wherein each track has a plurality of sequentially active interspersed first and second servo sectors said first servo sector comprising a plurality of servo bursts and said second servo sector comprising a single servo burst wherein the servo sectors are separated by a data region, the method comprising the steps of:

• reading a track identification field from the first servo sector;
• reading a plurality of burst amplitudes from the first servo sector;
• calculating a position error signal from the track identification field and the plurality of burst amplitudes;
• providing a correction signal from the calculated position error signal;
• reading a single burst amplitude from the second servo sector;
• comparing the single burst amplitude to one of the plurality of burst amplitudes;
• and
• if the single burst amplitude differs by more than a predetermined threshold amount from the one of the plurality of burst amplitudes, aborting a current disk data transfer operation.