Patent ID: 8125738

Claim:
In a hard disk drive kHDD) having a base, a disk having a recording surface, and an actuator mounted on the base so as to be rotatable about a first axis of rotation, the actuator including a swing arm having a front end at which a read/write head is supported, and a rear end disposed on an opposite side of the first axis of rotation from the front end, an actuator latch system that locks the actuator in a state in which the read/write head is parked when the HDD is not operating, the actuator latch system comprising: first and second protrusions each projecting from the rear end of the swing arm, the first and second protrusions having first and second engaging surfaces, respectively; and a latch lever mounted to the base so as to be freely rotatable about a second axis of rotation parallel to the first axis of rotation, the latch lever having a leading end, and first and second hooks disposed at upper and lower parts of the leading end, the first and second hooks having first and second engaging surfaces, respectively, and wherein the engaging surfaces of the first hook and first protrusion contact each other along a first interface when the swing arm is in a first relative rotational position, with respect to said first axis of rotation, while the HDD is in the state in which the read/write head is parked, the engaging surfaces of the second hook and second protrusion contact each other along a second interface when the swing arm is in a second relative rotational position, in which the swing arm is rotated about said first axis relative to said first relative rotational position, while the HDD is in the state in which the read/write head is parked, and the first and second interfaces are at different levels, in the HDD, in an orientation of the HDD in which the first and second axes of rotation extend vertically.