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| Number | Title | Issue Date |
| 7619844 | Disk drive comprising a mechanical position sensor to prevent a runaway condition A disk drive is disclosed including a disk having a plurality of servo sectors that define a plurality of servo tracks, an actuator arm, a head attached to a distal end of the actuator arm, a mechanical position sensor operable to detect an estimated position of the... | 11/17/2009 |
| 7619845 | Method and apparatus for controlling disc drive using counter-electromotive force A method and an apparatus to control a disc drive, and more particularly, a method and an apparatus to control a disc drive using an indirectly determined counter-electromotive force. The method of controlling the disc drive using a counter-electromotive force inclu... | 11/17/2009 |
| 7619846 | Self-servo writing using staged patterning An apparatus and method for servo writing are disclosed. The method includes writing of first servo data to a medium, detecting a velocity integrated position of the first servo data, and writing second servo data in relation to the detected position of the first se... | 11/17/2009 |
| 7619847 | Head controller, storage device, and head controlling method A level peak-acquiring unit acquires a peak of a signal level during a calibration wherein a heater power is increased from zero to a predetermined power. A sample acquiring unit acquires in a sampling range, a sample of a combination of the heater power and the sig... | 11/17/2009 |
| 7616398 | Fly height adjustment device calibration A method for calibrating a fly height adjustment device comprises flying a magnetic transducer coupled with a head gimbal assembly at a fly height from a magnetic recording data track. The magnetic transducer is coupled with a fly height adjustment device. Read-back... | 11/10/2009 |
| 7616397 | Disk drive and disk drive control method Embodiments in accordance with the present invention improve the head characteristic and avoid collisions between a head element section and a recording disk. A hard disk drive according to an embodiment of the present invention performs TFC (Thermal Fly height Cont... | 11/10/2009 |
| 7609472 | Power and thermal management for a hard drive According to certain embodiments of the present invention, a data storage device is provided. The exemplary data storage device includes actuation mechanism control circuitry configured to selectively operate an actuation mechanism at first and second performance le... | 10/27/2009 |
| 7609473 | Dissipation of liquid droplets in a magnetic disk drive Magnetic disk drives and associated methods are described for an improved process for dissipating liquid droplets that may accumulate on a slider of the magnetic disk drive. For the droplet removal process, the slider having the liquid droplet is unloaded from the m... | 10/27/2009 |
| 7605997 | Head-gap calculating device, storage device, head-gap calculating method, and computer product A harmonic wave obtaining unit performs a fast Fourier transform (FFT) operation on repeatable run out (RRO) correction data in the time domain and transforms the RRO correction data into a higher harmonic signal data in the frequency domain. A selective-output unit... | 10/20/2009 |
| 7605995 | Servo writer, signal output control method and manufacturing method of magnetic tape using the signal output control method A recording current to be supplied to a magnetic head is regulated by a signal output control unit. A peak value (either of positive-going peak value and a negative-going peak value) is detected in each pulse of a digital signal resulting from analog-to-digital conv... | 10/20/2009 |
| 7605996 | Method and system for detecting a change in a rotational velocity of a magnetic disk or a spindle coupled to the magnetic disk A method according to one embodiment comprises detecting a change in a rotational velocity of a magnetic disk or a spindle coupled to the magnetic disk, the change being caused by head-disk contact. A method for detecting head-disk contact according to another embod... | 10/20/2009 |
| 7602571 | Apparatus and method to control flying height of magnetic head in retry mode and disk drive using the same An apparatus and method to retry data read and write while changing a flying height of a magnetic head in a disk drive. The apparatus includes the magnetic head including a magnetic read element to sense a magnetic field on a disk and a magnetic write element to mag... | 10/13/2009 |
| 7602572 | Stability margins and error recovery in servo control systems 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 sens... | 10/13/2009 |
| 7602573 | Device and method for adjusting distance between magnetic head and data storage medium A device and method for adjusting a distance between a magnetic head and a data storage medium are provided. In the device, a microprocessor outputs a control signal for adjusting the distance to a pre-amplifier based on a correlation between a flying height (FH) an... | 10/13/2009 |
| 7602574 | Storage apparatus, storage medium, and control method and program of storage apparatus In a storage medium to which information is recorded by using a write head of an inductive type, in addition to a servo section in which servo information is recorded and a data section to which data is to be written, a write training section on which training write... | 10/13/2009 |
| 7602575 | Disk drive adjusting estimated reader/writer offset to achieve target burst crossing signal amplitude when propagating servo sectors A disk drive is disclosed comprising control circuitry for self servo writing a disk. An estimated reader/writer offset is initialized, servo bursts in a first servo track are read, the head is moved radially using the estimated reader/writer offset, and propagated ... | 10/13/2009 |
| 7599143 | Information recording/reproduction apparatus, head levitation height control method and head levitation control circuit There is provided an information recording/reproduction apparatus, a head levitation height control method, and a head levitation control circuit capable of adequately controlling a head levitation height. An information recording/reproduction apparatus havin... | 10/06/2009 |
| 7595952 | Magnetic head evaluation apparatus and method for manufacturing magnetic disk drive using the same Embodiments in accordance with the present invention provide a low-priced magnetic head evaluation apparatus capable of evaluating characteristics at high speed. According to one embodiment, a magnetic head evaluation apparatus includes a spindle motor, a VCM actuat... | 09/29/2009 |
| 7593178 | Method of reducing abrasion of disk by using dithering process and disk drive using the same Embodiments of the invention reduce abrasion of a disk via a dithering process that spreads a friction area between a magnetic head and the disk when a magnetic head lifts from the surface of the disk. In embodiments of the invention, the dithering process is execut... | 09/22/2009 |
| 7593179 | Control apparatus, storage apparatus, and writing control method A control apparatus detects positional information of a head performing writing processing every predetermined time interval, and computes next-sample projected positional information of the head based on the difference between the positional information detected th... | 09/22/2009 |
| 7589928 | Magnetic recording device including a thermal proximity sensor 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 chang... | 09/15/2009 |
| 7589929 | Servo pattern writing apparatus, servo pattern writing method, servo pattern reading apparatus, and servo pattern reading method There is provided a technique capable of eliminating the need to create data for compensating the displacement of a servo pattern occurring at the time of writing the servo pattern using an amplitude method and thereby of significantly reducing the production time o... | 09/15/2009 |
| 7586710 | Control of transducer to tape spacing A tape drive apparatus for reading and writing data on a magnetic tape includes at least one transducer that interacts with the magnetic tape. A temperature control element is positioned to thermally expand the transducer. A control system controls the amount of cur... | 09/08/2009 |
| 7586711 | Magnetic performance of a magnetic transducer operating within a hard disk drive A method for improving the magnetic performance of at least one magnetic transducer operating within a hard disk drive. The method comprises flying the magnetic transducer at a distance of separation from a magnetic recording media. The magnetic transducer is couple... | 09/08/2009 |
| 7586709 | Read write offset error correction using geometric reference in self servo write process A hard disk drive having a self servo write offset error correction mechanism to improve self servo write process is disclosed. In accordance with certain aspects of the present invention, there is provided a self servo write method that can measure an accurate posi... | 09/08/2009 |
| 7583465 | Disk drive adaptive resonance compensation method and apparatus A method used in a disk drive system for compensating a frequency component affecting servo control performance. The method includes detecting a frequency component affecting a servo control output in a disk drive/head during a manufacturing process and storing the ... | 09/01/2009 |
| 7583467 | Hard disk drive apparatus, method to control flying on demand of hard disk drive apparatus using thermal asperity signal, and recording media for computer program thereof A method to control an FOD (flying on demand) voltage of a hard disk drive apparatus using a TA (thermal asperity) signal includes providing at least one protrusion having a predetermined height on a disk, moving a magnetic head to a position of the protrusion, and ... | 09/01/2009 |
| 7583466 | Disk drive determining operating fly height by detecting head disk contact from disk rotation time A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises a spindle motor for rotating the disk, and a head actuated radially o... | 09/01/2009 |
| 7580216 | Disk servo pattern writing Systems and techniques to write servo patterns on machine-readable media. In general, in one implementation, the technique includes: obtaining timing information from a spiral servo reference track on a machine-readable medium to determine head position, and generat... | 08/25/2009 |
| 7576939 | Discontinuous mode back EMF measurement A terminal voltage of an actuator motor is measured while the actuator motor is in a high impedance state. An internal voltage of the actuator motor is measured, and a back-EMF voltage of the actuator motor is estimated in response to the terminal voltage of the act... | 08/18/2009 |
| 7576937 | Disk drive and control method therefor Embodiments in accordance with the present invention provide a disk drive capable of verifying whether the speed of an actuator is true or not, the speed being detected while the actuator is being moved between a retracted position and a recording surface of a magne... | 08/18/2009 |
| 7576938 | Hard disk drive, method for controlling FOD voltage thereof, and computer readable recording medium recording the method A flying on demand (FOD) voltage of a hard disk drive (HDD) is controlled by detecting a shock occurring to the HDD on which a magnetic head that records data on a disk or reproduces data from the disk is mounted, and if the shock is detected, controlling the FOD vo... | 08/18/2009 |
| 7573669 | Method and apparatus for writing pattern on disk Embodiments in accordance with the present invention ensure that the pitch of a servo write track is accurately controlled. According to one embodiment of the present invention, a Self Servo Write (SSW) uses different methods and sequences to identify read-write off... | 08/11/2009 |
| 7573668 | Method and apparatus for sensing leakage current to estimate and possibly adjust flying height of a read-write head in a hard disk drive A slider, flexure finger, head suspension assembly, head gimbal assembly, main flex circuit, actuator assembly, spindle motor, embedded circuit, and hard disk drive using and/or supporting method of estimating flying height of read-write head near rotating disk surf... | 08/11/2009 |
| 7573670 | Disk drive seeking to OD track and then ramping velocity to implement fast unload A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of embedded servo sectors. A head connected to a distal end of an actuator arm is rotated about a pivot by a voice coil motor (VCM) in order to actuate ... | 08/11/2009 |
| 7570450 | Tape heads for use with multiple tape formats A magnetic head according to one embodiment includes an array of elements, the elements being selected from a group consisting of data readers, data writers, and combinations thereof, wherein a first subset of the elements is operable for reading or writing data in ... | 08/04/2009 |
| 7570449 | Retract control method of HDD and HDD using the same A retract control method of an HDD to prevent a head from landing on a disk due to a retract failure and an HDD using the same. The retract control method includes performing a retract operation of retracting a head on the ramp, determining whether the head is norma... | 08/04/2009 |
| 7570448 | Write-once type storage apparatus, control method and record control circuit In a write-once type storage apparatus, a head having a recording element and a recording element is supported at the leading end of a rotary actuator, and information written once in a disk medium by the head is then reproduced. A write processing unit writes infor... | 08/04/2009 |
| 7567402 | Storage device, control method thereof and program The storage device of the invention has a ramp mechanism which shakes out the head onto the disk medium, and causes the head to evacuate from the medium to hold it. The command queuing processing unit stores input/output commands into the command queue in the order ... | 07/28/2009 |
| 7567403 | Bi-directional servo track writing to minimize sidewall writing at high skew angles An apparatus and associated method of servo writing to a storage media is provided that writes servo information at a first orientation pattern from a first storage extent of the storage media to a medial portion of the storage media, and writes servo information at... | 07/28/2009 |
