A disk drive is disclosed comprising a disk, and a head actuated radially
over the disk. A first linear acceleration signal is generated
representing a first acceleration disturbance, a second linear
acceleration signal is generated representing a second acceleration
disturbance, and a third linear acceleration signal is generated
representing a thermal popping disturbance. The first linear acceleration
signal is combined with the third linear acceleration signal to generate
a fourth linear acceleration signal representing a combined physical
shock disturbance and thermal popping disturbance.