Storage device and control circuit

A control circuit in a device comprising a rotary actuator configured to position a head with respect to a storage medium and cause the head to perform reading operation or writing operation, the control circuit comprising:

• a pair of vibration detectors located at positions on the device substantially on both sides of a rotation center of the rotary actuator, the vibration detectors configured to detect rotation vibration component of a one-axis direction and output a vibration detection signal;
• an analog operation circuit configured to calculate a rotation vibration detection signal proportional to rotation vibration disturbance applied to the rotary actuator by differential amplification of the vibration detection signal from the vibration detectors and output the rotation vibration detection signal;
• an analog-to-digital converter configured to convert the rotation vibration detection signal output from the analog operation circuit into a digital signal and output rotation vibration detection data;
• and
• a rotation vibration compensation controller configured to control the rotation vibration disturbance applied to the rotary actuator to be eliminated based on the rotation vibration detection data output from the analog-to-digital converter.