provided are a data storage device and a method of tracking data stored in the data storage device . the device includes a data storage medium on which data can be recorded and erased , a plurality of probes for scanning the data storage medium to detect data , a scanner for driving the data storage medium or the probes , and a controller for applying a control signal to the scanner . the method includes oscillating the probe or the data storage medium ; detecting an off - track error of the probe on the data storage medium by the oscillation ; and adjusting a scanning position of the probe on the data storage medium to compensate for the off - track error .