Maxtor Corporation

Digital Equipment Corporation

Quantum Corporation

Patrick L Hearn

Kumaraswamy Kasetty

Thomas George Andrikowich

Charles M Riggle

William D Lewis

Fernando A Zayas

Antonios E Prentakis

Kenneth F Veseskis

Shyam C Parikh

Hain-Ling Liu

Edward Courtney, Jr

Kannimangalam V Viswanathan

A drive housing ( ) including a housing cover wall ( ), a housing base wall ( ) having at least one wall aperture ( ), and one or more housing side walls ( ) that secure the housing base wall ( ) to the housing cover wall ( ). The drive housing ( ) also includes at least one connector ( ) that carries electrical signals through the drive housing ( ). Each connector ( ) extends through a corresponding wall aperture ( ). The drive housing ( ) also includes a sealer ( ) that seals each connector ( ) to the housing base wall ( ). The housing base wall ( ) has a wall coefficient of thermal expansion, and the sealer ( ) has a sealer coefficient of thermal expansion. Preferably, the wall coefficient of thermal expansion is substantially similar to the sealer coefficient of thermal expansion. As a consequence, leakage of gas through the drive housing ( ) of the disk drive ( ) is significantly reduced.

Drive housing with integrated electrical connectors

Hermetic seals that maintain a data storage device atmosphere enable the use of alternate atmospheres to reduce the aerodynamic drag and turbulent excitation within the head/disk assembly (HDA). A metallic seal having a base layer and a plating layer is compressed between the data storage device cover and base such that the plating layer fills surface asperities of the cover and base to create a hermetic seal therein between. Alternatively, the data storage device is encased inside a metallic can formed by seam sealing two housings together. Alternatively, an epoxy seam is dispensed around the periphery of the data storage device base to seal the cover thereon. An O-ring acts as a barrier to isolate the epoxy from the HDA atmosphere.

Hermetically sealed data storage device with double seam seal

Hermetic seals that maintain a data storage device atmosphere enable the use to alternate atmospheres to reduce the aerodynamic drag and turbulent excitation within the head disk assembly (HDA). A metallic seal having a base layer and a plating layer is compressed between the data storage device cover and base such that the plating layer fills surface asperities of the cover and base to create a hermetic seal therein between. Alternatively, the data storage device is encased inside a metallic can formed by seam sealing two housings together. Alternatively, an epoxy seam is dispensed around the periphery of the data storage device base to seal the cover thereon. An O-ring acts as a barrier to isolate the epoxy from the HDA atmosphere.

Hermetically sealed data storage device with adhesive seal

Hermetically sealed data storage device

A device and method for storing magnetically readable data are provided, the device including a disk having a substantially rigid, non-magnetizable substrate having a substantially planar surface and a magnetizable film having a substantially uniform thickness formed over the substantially planar surface. The disk has an outer surface having a nominal surface plane, and the outer surface includes a plurality of marks, each having a bump height above the nominal surface plane, a crater depth below the nominal surface plane, a mark radius, a bump radius of curvature, a crater radius of curvature and a separation from a consecutive mark, and at least one of the bump height, the crater depth, the mark radius, the bump radius of curvature, the crater radius of curvature and the separation is substantially randomly distributed according to any distribution of random variables such as, for example, a Gaussian normal, uniform, Poisson-like or Bernoulli-like binomial-like distribution.

Randomly laser-textured magnetic recording media

In the manufacture of a high capacity data storage device having multiple surfaces for recording information, the yield of the manufacturing process is improved by providing the storage device with a spare surface. If a recording surface is found to be totally defective, or, substantially worse than the other surfaces, as determined by the manufacturing testing procedures, that surface is, by means of a remapping table, logically retired and the information intended for the defective surface is stored on the logically reallocated spare surface.

Method and apparatus for surface reallocation for improved manufacturing

A magnetic tachometer for generating a signal as a function of the velocity of a transducer positioning arm in a disk drive. The tachometer is formed by a pair of fixed parallel coils separated by a distance sufficient to allow a magnet, attached to a counterbalance portion of the rotary positioning arm, to move therebetween and thus to generate a voltage as a function of the velocity of the magnet. The coils are each wound over a thin armature member which is saturated by the magnet's magnetic field and they are differentially coupled to produce common mode rejection.

Magnetic tachometer for disk drives

A method of manufacturing a magnetic tachometer used to generate a signal as a function of the velocity of a transducer positioning arm in a disk drive. The tachometer is formed over a one piece plastic insert having a first and second portion separated by a central breakaway region. An armature member is disposed over each of said first and second insert portion and a flexible connector is placed on a groove cut on a surface of said plastic insert. Two coils are simultaneously wound over said first and second insert portion, respectively, and connected to the flex connection. The insert is then bent to snap the breakaway region, and the resulting two coil subassemblies are folded and fastened to spacers to form a pair of fixed parallel coils. The separation between the coil is maintained at a predetermined value by the spacers to allow a magnet, attached to a counterbalance portion of a rotary positioning arm, to move therebetween and thus to generate a voltage as a function of the velocity of the magnet.

Growing community of inventors

Acton, MA, United States of America

Patrick L Hearn