Embodiments of the invention provide a data storage apparatus and its control method capable of accurately reading/writing data. A data storage apparatus in an embodiment of the invention comprises: a servo control section which, based on servo data stored on the storage medium, generates servo control data to control the position of the head; a sensor to detect vibration; a compensation data generating section which generates compensation data to compensate for the head's position error caused by vibration; a drive signal generating section which can generate a drive signal to move the head based on the servo control data and the compensation data; an arithmetic processing section which updates a rating value to evaluate the level of vibration given to the data storage apparatus; and a determination processing section which, according to the updated rating value, determines whether to perform the compensation using the compensation data; wherein the drive signal generating section compensates the servo control data using the compensation data in generating the drive signal.