Patent ID: 7333282

Claim:
A data storage device comprising: a recording disk; an actuator configured to move a head over said recording disk; a controller configured to prohibit said head from writing onto said recording disk for a first period when a detected impact is found to be greater than a first reference level and not greater than a second reference level, and prohibiting said head from writing onto said recording disk for a period longer than said first period when said detected impact is found to be greater than said second reference level; and a shock sensor, wherein, when a seek operation is performed in a write sequence, said controller judges, in accordance with an evaluation value derived from the output of said shock sensor, whether said detected impact is greater than said second reference level, and wherein, when a track following operation is performed in said write sequence, said controller judges, in accordance with an evaluation value derived from a servo signal read by said head, whether said detected impact is greater than said second reference level.