Abstract: A generally rectangular outer housing is sized to fit within the full height five and one quarter inch form factor. A drawer is mounted for sliding motion within the housing along a longitudinal axis thereof from a retracted position in which the drawer is substantially fully contained within the housing to an extended position in which a forward portion of the drawer extends beyond a forward transverse end of the housing. A DAT tape drive is mounted within a rear portion of the drawer and has a forwardly opening cassette insertion slot. A cassette magazine is provided that has a plurality of vertically spaced receptacles for holding a plurality of DAT cassettes in a vertically stacked configuration. A magazine loader is mounted in the forward portion of the drawer for receiving and vertically reciprocating the cassette magazine and for selectively transferring cassettes between the magazine and the cassette insertion slot of the DAT tape drive.

Abstract: A device for reducing the contamination of a disc being coated during an ion beam deposition process. The ion beam deposition process is performed in a chamber having an upper portion and a lower portion with the disc being disposed in the lower portion of the chamber. An ion source is introduced into the lower chamber for generating an ion beam for depositing ions on the disc. In the upper portion of the chamber is a pump for creating negative pressure in the chamber. A portion of the ion beam contacts the pump forming contaminants on the pump which cause the contamination of the disc. A baffle assembly is disposed in the chamber between the pump and the ion source. Said baffle assembly includes a baffle that reduces the portion of the ion beam contacting said pump thereby reducing the forming of contaminants on the pump.

Abstract: Method for removing random scratches formed during the polishing of magnetic recording media, and for disposing on the surface of the media a near-circumferential texture which increases the recording reliability of the media while simultaneously reducing its failure rate. The present invention teaches the application of a low unit load force to a large surface pad and polishing tape combination while in contact with a rotating disk surface that is also moving in a circumferential direction to completely remove the random scratches previously formed by a polishing step. The scratches are removed with the aid of a specially designed, extremely fine alumina slurry composition which prevent producing similar size circumferential scratches at the high surface speeds. The methodology provides for a smoother disk surface than prior known super-polish/texture methodologies.

Abstract: A brushless permanent-magnet direct current motor has a permanent magnet which is magnetized to create an offset angle between detent and mutual torques for providing sufficient starting torque for all relative orientations between the stator and the rotor of the motor. This is accomplished by providing a permanent magnet in which the global magnetization of the magnet has been disrupted by the application of a local magnetic field to a portion of the magnet, thereby to provide a magnetic anomaly in the global magnetization. Also, a method of magnetization of the magnet is described.

Abstract: An method and apparatus for the assembly of motors utilizing curable adhesives. The method includes stations for: treating motor components with adhesive, assembling the motor components piece by piece, holding assembled motor components under compressive tension, overgramming components as needed, and an operational and life testing station. Integral to using the method are multi-position preload/cure fixtures. These fixtures include frame and base pieces. The frame holds assembled and adhesive treated motor components under compressive tension with spring loaded guide shafts during the curing process. The frame rests on the base. The base features nests which align the motor components for engagement with the guide shafts. The base also features a retractor bar to facilitate the insertion and removal of motor components. The base also features an overgramming means which supplies a brief overgramming pressure on the motor components to fully seat motor components.

Abstract: A disk caddy is disclosed which prevents particles generated during the process of securing a disk caddy lid to a disk caddy housing from reaching a stored disk. The disk caddy includes a barrier extension, which extends from the lid in one embodiment of the invention. The barrier extension is located towards the end of the lid and, in one embodiment, inserts into a slot in the housing which is otherwise intended to receive a disk.

Abstract: A disc drive system having at least one hard disc having concentric tracks is supported by a hub positioned in a centrally located aperture. The disc is rotated at a constant speed by a DC motor attached to the hub. A transducer head for communicating information with the hard disc is moved relative to the disc surface by a positioning apparatus. The positioning apparatus includes a voice coil motor for selectably and accurately positioning the transducer head over the tracks on the hard disc. The disc drive system is enclosed in a housing having a base portion and a roof portion. The positioning apparatus includes a shaft about which the transducer head rotates to move the transducer from track to track. In one configuration, permanent magnets are attached to the base and roof, and a moving coil is interposed between them, the housing completing a magnetic circuit in the VCM. In one aspect the disc drive system is designed to be permanently mounted in a portable, lap-top or notebook computer.

Abstract: Translating between physical and logical (or virtual) address spaces occurs autonomously using information decoded by an address mode translator from command bits within a host CPU issued command. The translator communicates with a hard disc controller unit local microprocessor or microcontroller and controller unit task registers. A host CPU issued command interrupts the local microprocessor and activates the address mode translator by writing to an appropriate controller unit task register using indirect addressing. The address mode translator preferably provides four algorithms, with algorithm selection occurring autonomously according to the decoded command bits. The algorithms provide physical block address to physical CHS cylinder-head-sector conversion, logical CHS to logical block address conversion, and also provide divide and multiply functions, useful for disc caching.

Abstract: Lubricated magnetic recording discs are provided by vapor deposition of narrow molecular weight fractions of a terminally functionalized perfluoropolyether. The coatings are found to provide stable lubrication over extended periods of time in CSS cycles.