Actuator block having dual sensors for detecting the vibration on magnetic disk drive

A magnetic disk device comprising:

• an actuator assembly including an actuator block including a rotatable bearing unit;
• a plurality of heads movably supported in a first direction by the actuator assembly and aligned at intervals in a second direction intersecting the first direction;
• a board fixed to a first side surface in the first direction of the actuator block;
• a first sensor provided on the board;
• a second sensor provided on the board at a position different from the first sensor;
• and
• a voice coil connected to a second side surface intersecting the first side surface of the actuator block, wherein
• a first region of the board is fixed to the actuator block by a first screw and a second region apart from the first region in the second direction of the board is fixed to the actuator block by a second screw,
• the heads extend from the actuator block on an opposite side to the second side surface in a third direction intersecting the first direction and the second direction,
• the first sensor is provided in the first region and is located between the voice coil and the first screw in the third direction, and
• the second sensor is provided at a position apart from the first sensor in the second direction, is provided in the second region, and is located between the voice coil and the second screw in the third direction.