Abstract: A disc drive top cover incorporates an acoustic damper having alternating constraining layer material and damping layer material. Each constraining material layer is a sheet material having a high mechanical stiffness. Each damping material layer is a visco-damping adhesive having a pre-selected maximum damping efficiency for a particular disc drive operating condition. The acoustic damper may also include a carrier layer between damping layers so that multiple layers of damping material can be incorporated between any two constraining layers.

Abstract: An actuator assembly suitable for a disc drive with at least one rotating disc for storing information. The actuator assembly has an actuator body having a mounting opening with at least a portion of the mounting opening being threaded and a bearing cartridge having an outer surface with at least a portion of the outer surface being threaded. The bearing cartridge is threadably received within the mounting opening of the actuator body so that the actuator body is releasably secured to the bearing cartridge. A method for securing an actuator body to a bearing cartridge in an actuator assembly of a disc drive is also provided.