Abstract: An actuator fixing apparatus for a disk drive of a computer is disclosed. In a disk drive system having a disk capable of being rotated at a high speed by a spindle motor, a pivotally installed actuator, head gimbals installed on one end of the actuator connecting the actuator to a magnetic head, a voice coil motor and a bobbin positioned on a bottom portion of the actuator, an actuator fixing apparatus includes an automatic locking arm extending from an end portion of the actuator. The automatic locking arm has a locking groove formed on a bottom portion thereof. The apparatus also includes a stopper having first and second locking magnets and a hook-shaped locking unit rotatably installed adjacent to the stopper having first and second metal conducting plates. The hook-shaped locking unit has a locking projection extending from it, whereby the locking projection is inserted into the locking groove to prevent movement of the actuator.