Actuator assembly having dual sensors for detecting the vibration on magnetic disk device

A magnetic disk device comprising:

• a housing that comprises a base that comprises a bottom wall and side walls standing along a circumference of the bottom wall, and a cover facing the bottom wall and closing the base;
• an actuator assembly that is housed inside the housing and is rotatable around a rotation axis;
• a head movably supported by the actuator assembly;
• a control circuit board provided outside of the housing;
• a first sensor disposed on the control circuit board;
• a second sensor disposed inside the housing;
• a voice coil motor configured to control an operation of the actuator assembly;
• a micro actuator configured to finely control operations of the head;
• and
• a controller configured to control the voice coil motor and the micro actuator, wherein
• the first sensor and the second sensor are arranged on a straight line passing through the rotation axis;
• the first sensor is located in an opposite direction to the second sensor with respect to a center of the actuator assembly in a height direction from the bottom wall toward the cover;
• the controller calculates a third acceleration of the head based on a first acceleration detected by the first sensor and a second acceleration detected by the second sensor, and controls the micro actuator based on the third acceleration.