A self-servowriting (SSW) method that, with the actuator fully engaged
against a compliant structure (e.g., a crashstop), first writes a
tightly-spaced open-loop sequence of servo bursts in a segmented spiral
path and then continues writing this tightly-spaced sequence under
closed-loop servo control while reading back amplitude information from
the servo bursts written earlier until the tightly-spaced burst pattern
extends over several read-write head (RWH) offset intervals. With the
actuator still engaged against the compliant structure, this
tightly-spaced startup sequence is then read back by the closed servo
control loop to write a number of concentric servo seed tracks, which are
then self-propagated across the remainder of the disk surface to produce
a final servopattern.