Patent ID: 7580221

Claim:
A magnetic disk drive comprising: a magnetic disk medium; a spindle carrying said magnetic disk medium thereon rotatably; a spindle motor configured to impart a rotational drive force to said spindle; a magnetic head configured to write or read information to or from said magnetic disk medium; a slider carrying said magnetic head thereon; a suspension connected to said slider to support the slider; a carriage connected to said suspension to support the suspension; a coil supported by said carriage; an electronic circuit configured to control said spindle motor, said magnetic head, or said coil; a sensor to detect an acceleration having a component perpendicular to a surface of said magnetic disk medium; and a processor configured to receive outputs of said electronic circuit and said sensor and to provide a compensation signal to the coil based on the outputs of the said electronic circuit and said sensor, wherein a positioning error between the magnetic head and a target position is diminished using the output of said sensor.