Abstract: A disc assembly in a disc drive includes a hub rotatable about a central axis. Pluralities of disc elements are mounted about outer periphery of the central axis of the hub. An annular shaped disc clamp is located about a first axial end of the hub, the annular shaped clamp holding the outermost disc to the hub by a series of equally spaced fasteners along an inner diameter of the disc clamp. The improvement therein consisting of placing an offset angle on the underside, or disc-to-hub contact area. The offset angle sloping from the inner disc contact point outward to the end of the clamp such that application of pressure during clamping will make a uniform contact area along the clamp surface as the clamp fasteners are tightened to secure the clamp to the hub. This improves flatness, axial run out, reduces repeatable run out and increases reliability.

Abstract: A flexlead circuit assembly is provided for use in a rotary disk storage system and is designed so that the inherent bias force exerted by the flexible circuit on the actuator arm of the disk storage system is negated. The flexlead circuit herein is split into two sets of flexlead conductors: one to supply power and ground to the actuator VCM and other to transmit signals to and from the read/write heads. The end of each of these flexlead conductors opposite to the end mounted to the actuator arm is integrally formed with and provides signal communication with a printed circuit mounted within the housing. The printed circuit is formed on a substrate which is snap-fit to the lower plate of the disk drive housing to thereby not only support the printed circuit within the housing, but also to provide mechanical support for the flexlead circuit.

Abstract: A rotary disk storage system is provided for use with portable or laptop computers which is designed to achieve an overall maximum height ("Z-height") not greater than 17 mm. In attaining this result, the top cover and lower base plate of the housing of this rotary disk storage system are sealed by a pressure sensitive adhesive which permits the top cover to "float" on the lower base plate. Moreover, the reduced overall height is attained by forming the spin motor which rotates the magnetic disks integrally with the lower base plate. Further, IC chips are mounted on the printed circuit board to provide signal processing to a host computer, these IC chips being mounted on one side of the printed circuit board to face the lower base plate of the disk storage system. When the rotary disk storage system of the present invention is assembled, each of these IC chips is accommodated within differentially-sized pockets formed in the bottom surface of the lower base plate.

Abstract: A rotary disk storage system is provided for use with portable or laptop computers which is designed to achieve an overall maximum height ("Z-height") not greater than 17 mm. In attaining this result, the top cover and lower base plate of the housing of this rotary disk storage system are sealed by a pressure sensitive adhesive which permits the top cover to "float" on the lower base plate. Moreover, the reduced overall height is attained by forming the spin motor which rotates the magnetic disks integrally with the lower base plate. Further, IC chips are mounted on the printed circuit board to provide signal processing to a host computer, these IC chips being mounted on one side of the printed circuit board to face the lower base plate of the disk storage system. When the rotary disk storage system of the present invention is assembled, each of these IC chips is accommodated within differentially-sized pockets formed in the bottom surface of the lower base plate.