An apparatus and method for dynamic head switch timing recalibration are provided.
With the apparatus and method, a determination is made as to whether a difference
in a reference head switch timing and the head switch timing at a later time is
sufficient to meet a certain criteria. If the difference meets the criteria, a
recalibration of the head switch timing is performed. For example, in a preferred
embodiment, the criteria is a number of address mark (AM) misses during a head
switch operation. If this predetermined number of AM misses is detected, then it
is determined that a recalibration is necessary since the predetermined number
of AM misses is an indication that the head switch timing has changed significantly
from the reference head switch timing.
