| Patent Number |
Title Of Patent |
Date Issued |
| RE40034 |
Method and apparatus to reduce serial communications path connection overhead |
January 22, 2008 |
| .[.Control of a loop of a fiber-channel arbitrated-loop serial communications channel is maintained (i.e., the loop connection is held open) as long as a minimum amount of data, which optionally is determined by programming (called a "programmable amount of data"), is available for t |
| RE38360 |
Dual channel readback recovery system |
December 23, 2003 |
| A dual channel readback recovery circuit includes a high resolution channel and a low resolution channel and a data latch. A logical filter in one or both channels rejects signals that are followed by other signals if they are spaced apart less than the rejection time interval allowed by |
| RE38340 |
Multi-point bending of bars during fabrication of magnetic recording heads |
December 2, 2003 |
| A device for lapping a bar of the type which carries a plurality of sliders used in magnetic storage systems includes first, second and third actuators adapted to couple to the bar, and impart a first, second and third controllable force in response to a first, second and third control |
| D599346 |
USB storage device housing |
September 1, 2009 |
|
| D446115 |
Shock protective vacuum-formed package for disc drives |
August 7, 2001 |
|
| 7624189 |
Transferring data between computers for collaboration or remote storage |
November 24, 2009 |
| Remotely communicating data between computers or devices across a wide area network for purposes of redundancy or collaboration. A service brokers the transfer of data between an initiating computer and a destination device, thereby establishing a peer-to-peer architecture by which d |
| 7623427 |
Surface inspection by amplitude modulated specular light detection |
November 24, 2009 |
| An apparatus for detecting defects on a disk surface includes a light source that generates a light beam and a beamsplitter that splits the light beam into a first light beam portion and a second light beam portion. The first light beam portion illuminates the surface of the disk and |
| 7621037 |
Fixturing a head spindle assembly with a retracting collet |
November 24, 2009 |
| An apparatus and associated method is provided for precisely positioning a datum surface of a component. The apparatus has a housing defining a tooling datum surface. A collet is supported by the housing, and is thereby selectively operable between an expanded mode and a retracted mo |
| 7620855 |
Self-defining counters |
November 17, 2009 |
| An apparatus and associated method for deriving an error code value to characterize an error event that occurs during execution of an access command, memorializing the error event in an indexable error table, and logging an association of the error code value and an index in the error |
| 7620772 |
Methods and structure for dynamic data density in a dynamically mapped mass storage device |
November 17, 2009 |
| Methods and structures for dynamic density control to improve reliability of a dynamically mapped storage device. In a dynamically mapped storage device in which all user supplied logical blocks are dynamically mapped by the storage device controller to physical disk blocks, features and |
| 7619852 |
Ground post in data storage device |
November 17, 2009 |
| In general, the invention is directed to apparatus that provides one or more low-impedance paths to ground in a data storage device, such as a disc drive, through one or more conductive posts. When a shield, circuit board and base of the data storage device are fastened to one another, |
| 7618721 |
Master for printing servo patterns |
November 17, 2009 |
| A master is provided for use in a magnetic printing process. Illustratively, the master is used for printing servo patterns on a magnetic recording medium. The master includes a substrate on which a magnetic underlayer material is disposed. A second magnetic material is disposed over |
| 7617358 |
Methods and structure for writing lead-in sequences for head stability in a dynamically mapped m |
November 10, 2009 |
| Methods and structures for writing thermal lead-in sequences to provide head stability in a dynamically mapped storage device. In a dynamically mapped storage device in which all user supplied logical blocks are dynamically mapped by the storage device controller to physical disk blo |
| 7616401 |
Metal injection molded base for a data storage system |
November 10, 2009 |
| The present invention provides a data storage system. The data storage system includes a metal injected molded base. The metal injection molded base includes a metal injection molded platform and at least one metal injection molded three-dimensional feature. The at least one metal in |
| 7613088 |
Method and system for time based file storage |
November 3, 2009 |
| A method and system for interleaving storage of data streams on a rotating storage medium of a data storage device comprise dividing the storage medium into a plurality of logical zones. Each logical zone of the plurality of logical zones extends radially from an inner diameter of the |
| 7609499 |
Active current limiting circuit |
October 27, 2009 |
| A current controller for a device is provided. The current controller includes power and ground inputs for connecting to a source of energization, and power and ground outputs for connecting to the device. A variable impedance is coupled in series between the power input and the powe |
| 7609488 |
Fly height actuator/void region in basecoat |
October 27, 2009 |
| A transducing device responsive to magnetic fields includes a writer, a reader, an actuator, and a void. The actuator is positioned proximate the writer and reader. The void is positioned between at least one of the reader and writer and a substrate of a sensing device. The void is also |
| 7609480 |
Heat-assisted magnetic recording head |
October 27, 2009 |
| An apparatus, comprising a slider. The slider includes a substrate with an air bearing surface and a trailing substrate side. The slider includes an optoelectronic heater and a magnetic head being mounted on the trailing substrate side. Thermal insulation is interposed between the op |
| 7609478 |
Magnetic writer pole with a graded magnetic moment |
October 27, 2009 |
| A magnetic writer includes a write pole configured to reduce a skew effect during writing to a magnetic medium. A trailing portion of the write pole has a magnetic moment greater than a leading portion of the write pole. |
| 7609469 |
Alternative sensors for tracking and timing in bit patterned media |
October 27, 2009 |
| An apparatus includes a bit patterned magnetic storage media, a write transducer positioned adjacent to the bit patterned magnetic storage media, a write driver coupled to the write transducer to deliver write pulses to the write transducer, an optical sensor for producing a bit patt |
| 7606364 |
Disk drive with flexible data stream encryption |
October 20, 2009 |
| A cipher engine performs cipher processing (encrypting/decrypting) on logical data streams in a physical data stream in a storage device. As the physical data stream changes from a first logical data stream to a second logical data stream, and the cipher engine switches from cipher p |
| 7603530 |
Methods and structure for dynamic multiple indirections in a dynamically mapped mass storage dev |
October 13, 2009 |
| Methods and structures for dynamic multiple indirections to improve reliability and performance of a dynamically mapped storage devices. In a dynamically mapped storage device in which all user supplied logical blocks are dynamically mapped by the storage device controller to physica |
| 7602863 |
Method and apparatus for providing iterative timing recovery |
October 13, 2009 |
| A method includes the steps of receiving a signal indicative of data bits, and performing per survivor processing-iterative timing recovery (PSP-ITR) on the received signal to generate probabilities of the data bits. To perform PSP-ITR on the received signal, the signal can be proces |
| 7602577 |
Rapid off track detection using in-drive microactuator |
October 13, 2009 |
| A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more piezoelectric elements used for purposes of secondary actuation. Uncontrolled movement of t |
| 7602572 |
Stability margins and error recovery in servo control systems |
October 13, 2009 |
| Adjusting a servo control system includes identifying a gain crossover frequency for the servo control system, generating a sensitivity function for the servo control system, measuring a sensitivity peak in the sensitivity function, comparing a frequency of the sensitivity peak to th |
| 7600359 |
Method of merging two disks concentrically without gap between disks |
October 13, 2009 |
| A disk cassette is provided with opposed side walls having ribs configured to facilitate merging pairs of disks. In most instances, the disks will be single-sided hard memory disks. The final position of the disks in the disk cassette will be in spaced pairs, with the disks forming each |
| 7600136 |
Power management in an information channel |
October 6, 2009 |
| Methods and associated apparatus to reduce electrical power consumption in an information channel may include identifying times at which to restore power to elements in the information channel, and restoring power to the elements at the identified times. Times for each element are identi |
| 7599213 |
Low surface energy coatings in probe recording |
October 6, 2009 |
| An apparatus includes a storage media having a surface coated with a lubricant, and a plurality of probes having tips contacting the lubricant, wherein the probes are coated with one of a fluorocarbon, perfluoropolyether, polytetrafluoroethylene, fluorinated ethylene propylene, polye |
| 7599147 |
Electrical feedthrough assembly with elastic ring interface |
October 6, 2009 |
| Apparatus for providing a low permeable interface in a hermetically sealed housing. The housing includes a substantially planar housing member with an aperture extending therethrough. An electrical feedthrough assembly extends adjacent the aperture to provide one or more electrical signa |
| 7596795 |
Vibration compensation based on identification of vibration frequency |
September 29, 2009 |
| A shock detection circuit housed in an electronic device includes an output shock signal that is indicative of vibration amplitude. To compensate for vibrations that are experienced by the electronic device, the output shock signal is analyzed. The analysis of the output shock signal |
| 7596072 |
Optical recording using a waveguide structure and a phase change medium |
September 29, 2009 |
| An apparatus comprises a slider having an air bearing surface, a first waveguide for directing electromagnetic radiation to a focal point adjacent to the air bearing surface, a storage medium position adjacent to the air bearing surface, a detector for detecting electromagnetic radia |
| 7595959 |
Recording heads including a magnetically damped write pole and recording systems including such |
September 29, 2009 |
| A magnetic recording system is disclosed in which the magnetization dynamics of the write head and recording medium are highly damped. The system may comprise a perpendicular recording head having a write pole, and a recording medium including a hard magnetic recording layer and a so |
| 7595957 |
Servo gain adjustment based on bias force error |
September 29, 2009 |
| Apparatus and related methods are described for adjusting servo gain. In an exemplary apparatus, a circuit determines a bias force error that occurs between an estimated bias force and an actual bias force on an actuator during movement by a servo motor. The circuit adjusts a servo g |
| 7594075 |
Metadata for a grid based data storage system |
September 22, 2009 |
| Metadata architecture and associated methodology for a data storage system employing a grid-based storage capacity wherein each grid defines a storage unit in terms of a plurality of storage domains along one axis against one or more rows of a plurality of storage stripes along another |
| 7593305 |
Removing spherical aberrations for two photon recording |
September 22, 2009 |
| A system and method is provided for adjusting a depth of focus in a refractive material without introducing spherical aberration as a result of the focal adjustment. The system and method provide a novel optical path in which a ramped prism is situated between an objective lens and a |
| 7593278 |
Memory element with thermoelectric pulse |
September 22, 2009 |
| A memory element comprises an addressable memory cell. A thermoelectric device couples to the memory cell. Electrical conductors provide a current pulse to the thermoelectric device. The current pulse generates a thermoelectric heat flow pulse between the thermoelectric device and the |
| 7593189 |
Head gimbal assembly to reduce slider distortion due to thermal stress |
September 22, 2009 |
| A head gimbal assembly (HGA) is provided. The HGA includes a suspension that has a suspension coefficient of thermal expansion (CTE) and a slider that has a slider CTE. A bonding element attaches the slider to the suspension. A compensation layer, having a compensation CTE, is located |
| 7593184 |
Rotating write field generated by circulating domain walls in a magnetic ring: a DC-driven high- |
September 22, 2009 |
| An apparatus comprises a ring of magnetic material, a source for applying a setting magnetic field to the ring, and first and second electrodes for applying an electric current to the ring. A method of using the apparatus to write to a magnetic storage medium is also provided. |
| 7592079 |
Method to improve remanence-squareness-thickness-product and coercivity profiles in magnetic med |
September 22, 2009 |
| A magnetic disk for information storage that includes a substrate and an information layer for containing information. The information layer includes a upper (e.g., recording) and lower (e.g., stabilizing) layers. The information layer has a remanence-squareness-thickness-product ("M |
| 7590800 |
2D dynamic adaptive data caching |
September 15, 2009 |
| Method and apparatus for caching readback data in a cache memory. Upon a transfer of cached readback data to a host device, a cache manager operates to force a retention of the readback data in the cache memory in relation to a time parameter and a locality parameter associated with |
| 7590799 |
OSD deterministic object fragmentation optimization in a disc drive |
September 15, 2009 |
| An apparatus includes a storage medium, an arm for positioning a recording head adjacent to the storage medium, and a controller for receiving objects and for selecting blocks on the storage medium to be written by the recording head based on information in the objects. A method for |
| 7590679 |
Managing multiple unit attentions |
September 15, 2009 |
| A format is provided for a command signal from a target device comprising a bit field adapted for communicating a unit attention signal from the target device following a status changing event. A method is provided for managing a unit attention signal from a target device in a distribute |
| 7589949 |
Fluid assisted emitter tip and method |
September 15, 2009 |
| An emitter tip for a corona discharge device. The emitter tip comprises an elongated body with a tapered end. The body defines a central passage and the tapered end defines a tip passage in fluid communication with the central passage. A method is provided for controlling electrostatic |
| 7589936 |
Center-tapped write coil |
September 15, 2009 |
| A slider for use in a disk drive system with a read/write head that has a write coil as part of a write transducer. The write coil has a center tap thereon for connection to a conductor in addition to the connection of the ends of the write coil to two other conductors. This allows the w |
| 7589930 |
Zone based repeated runout error compensation |
September 15, 2009 |
| Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is determined for each one |
| 7589928 |
Magnetic recording device including a thermal proximity sensor |
September 15, 2009 |
| A system includes a magnetic device for writing to and reading from a magnetic medium and a sensor disposed adjacent to the magnetic device and proximate to the magnetic medium. The sensor generates signals related to thermal variations in the sensor caused by changes in a distance betwe |
| 7589600 |
Spin oscillator device |
September 15, 2009 |
| A spin oscillator device generates a microwave output in response to an applied DC current. The device includes a spin momentum transfer (SMT) stack including a top electrode, a free layer, a nonmagnetic layer, a pinned magnetic structure, and a bottom electrode. A local magnetic field |
| 7589484 |
Closed loop acceleration control for a data storage device motor |
September 15, 2009 |
| Method and apparatus for accelerating a multi-phase motor having a rotatable rotor are disclosed. A first commutation state in which the rotor resides is identified, after which a Proportional, Integral and Derivative (PID) control routine is executed for closed loop control of an ac |
| 7588138 |
Device handling system |
September 15, 2009 |
| An apparatus and associated method for handling a device in a manner that enhances a self-purging efficiency with which debris in the device is ameliorated. The apparatus and associated method includes rocking the device along a rocker conveyor path defined by opposing rails supporting |
| 7587809 |
Method for forming a MR reader with reduced shield topography and low parasitic resistance |
September 15, 2009 |
| A magnetoresistive reader having a sensor, current contacts with low parasitic resistance and a top shield with substantially planar topology is fabricated by first defining a stripe height back edge of the sensor. Next, a reader width of the sensor is defined. The current contacts are |
