Patent ID: 6867950

Claim:
A disk drive, comprising: a disk; a head stack assembly for reading and writing to the disk, the head stack assembly comprising: a body portion defining a through bore that defines a pivot axis; an actuator arm cantilevered from the body portion; a head gimbal assembly coupled to the actuator arm; a coil portion cantilevered from the body portion in an opposite direction from the actuator arm, the coil portion defining first and second actuator fork members and including a wound coil supported by the first and second actuator fork members; a bobbin configured to stiffen the wound coil, the bobbin including a first surface that faces the wound coil and that defines a thickness of the bobbin, the first surface defining a plurality of cleating features configured to increase a surface area of the first surface, a largest dimension of each of the plurality of cleating features in a direction parallel to the pivot axis being less than the thickness of the bobbin, and an adhesive disposed between the first surface of the bobbin and the wound coil.