Abstract: A disk drive is usable in a chassis having first and second guide channels mounted on side surfaces of the chassis. The disk drive includes a head disk assembly that includes first and second side walls. The disk drive further includes first and second side rails and a securing system for securing the side rails to the side walls. The first and second side rails engage the first and second guide channels, respectively, for supporting the disk drive within the chassis. The securing system includes an engagement mechanism and a double-sided adhesive resilient mechanism. The engagement mechanism projects between the first and second side rails and the first and second side walls, respectively, of the head disk assembly.

Abstract: A system for balancing devices having motors and rotating masses to be coupled to the motors utilizes a momentum transfer mechanism to shift the rotating mass based on sensed imbalance. In this manner the mass is shifted to a position which accounts for the inherent imbalance in both the motor and the mass. A controller receives imbalance information from a velocity sensor and controls a solenoid to strike a base coupled to the motor to shift a lightly clamped mass relative to the motor. In one embodiment, a disk drive has disks initially biased by the system against a hub, and then shifted during rotation to create a disk drive having concentrically aligned disks offsetting imbalance inherent in a motor used to rotate the disks. In one embodiment, the disks are held to the hub by a clamp having screws. The screws are driven simultaneously through the same angle of rotation to ensure that the axial clamping force of each one is substantially equal.