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| Number | Title | Issue Date |
| 8134796 | Embedded track information for patterned media A bit-patterned magnetic media (BPM) includes with respect to each data track a first sub-track and a second sub-track, each sub-track comprised of a plurality of bit-islands. A transducer head placed over a data track generates a readback signal. Channel response c... | 03/13/2012 |
| 8116025 | Disk drive executing retry operation after adjusting jog value in response to gain control A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors. A head is actuated radially over the disk for generating a read signal. A first read of a data sector is performed while adjusting an ... | 02/14/2012 |
| 8023219 | Storage device, head position detection method and control circuit According to one embodiment, a storage device includes an area demodulator and a head position demodulator. The area demodulator demodulates a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head o... | 09/20/2011 |
| 7532429 | Write-head positioning method and disk drive A write-head positioning method includes steps of positioning a write head on a first track of a storage medium on the basis of a servo signal and writing a signal on the first track, positioning the write head on second and third tracks located adjacent to opposite... | 05/12/2009 |
| 7529058 | Track pitch examination method of storage apparatus, program, and storage apparatus Track pitches of all the tracks of a disk medium provided in a storage apparatus are examined in a manufacturing examination step. First of all, a target position path which varies a target track position so that the position crosses the tracks is generated, and a h... | 05/05/2009 |
| RE40545 | Servo control appartaus and method using absolute value input signals A servo control apparatus and method controls systems at least partially on the basis of an observable variable that has an absolute value functional relationship with the controlled variable and does not change sign for positive and negative variations from a nomin... | 10/21/2008 |
| 7397628 | Two degree of freedom position control method, two degree of freedom position control device, and medium storage device In a position control device based on a current observer control for performing two degree of freedom control, deterioration of the position accuracy caused by the output delay due to computation is prevented. In the two degree of freedom control system for preventi... | 07/08/2008 |
| 7397627 | Method of detecting position of head for recording medium A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each other. A variation is detected in the output supplied from the head b... | 07/08/2008 |
| RE40413 | Method and apparatus for developing a dynamic servo signal from data Apparatus using information about the extent of errors in sensed data for performing as a control function at least one of adjusting the position of a magnetic head to improve alignment relative to a track and selecting from two or more data signals a data signal ha... | 07/01/2008 |
| 7372382 | Voltage regulation using digital voltage control For one disclosed embodiment, error is sensed in a voltage at an output node. One or more analog signals are generated based on the sensed error. One or more generated analog signals are converted into one or more digital signals. The voltage at the output node is c... | 05/13/2008 |
| 7352526 | Offset measurement method for magnetic recording head and magnetic recording/reproducing device A storage device has a separate type magnetic head and a discrete type magnetic recording medium on which recording tracks and recording disabled areas are alternately formed. An accurate offset of the magnetic head with respect to the magnetic recording medium is m... | 04/01/2008 |
| 7333567 | Digital detector utilizable in providing closed-loop gain control in a transmitter A digital detector processes at least one received digital signal to generate a squared signal, encodes the squared signal, applies first and second portions of the encoded signal to a multiplier and a look-up element, respectively, and processes outputs of the mult... | 02/19/2008 |
| 7324295 | Method of detecting position of head in recording medium drive The difference is detected between the outputs from first and second heads in a recording medium drive. The first head is positioned relative to the boundary between a first recording track and a separation track isolating the first recording track and a second reco... | 01/29/2008 |
| 7319652 | Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Mo... | 01/15/2008 |
| 7312946 | Method and apparatus for servo control in a disk drive According to one embodiment, in a disk drive which performs positioning control of a head on the basis of a servo burst pattern recorded on a disk medium, a servo processor generates a tangent-equivalent value by using a burst value obtained from the servo burst pat... | 12/25/2007 |
| 7292401 | System and method for determining head-disk contact in a magnetic recording disk drive by magnetoresistive signal amplitude A system and method for determining head-disk contact (HDC) in a disk drive uses the signal from the magnetoresistive (MR) read head and does not require the presence of magnetic transitions on the disk. The method thus has application in head-disk testers or “spi... | 11/06/2007 |
| 7289857 | Data analysis system and method Data from a monitoring system is analyzed for monitoring characteristics of a dynamic system. Characteristic data in respect of a dynamic system is monitored and provided with at least one known normal state. Characteristic data is received from a monitoring system ... | 10/30/2007 |
| 7286317 | Disk drive that compensates for repeatable runout of a disk based on measured timing between servo information and methods thereof A disk drive includes a rotatable data storage disk, a transducer, an actuator, and a controller. The disk includes information and data tracks that are defined thereon. The transducer is configured to read the information from the disk. The actuator is configured t... | 10/23/2007 |
| 7283320 | Magnetic recording medium including servo and data bands in the magnetic layer A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recor... | 10/16/2007 |
| 7281175 | Readout controlling apparatus, reproducing apparatus, recording apparatus, and readout controlling method A readout controlling apparatus for controlling reading conditions at the time of reading data coded in units of predetermined code blocks from a recording medium capable of performing error correction at a high reliability even when the playback conditions are poor... | 10/09/2007 |
| 7271970 | Composite magnetic head arranged so the reproducing elements do not overlap a pole of a recording element A conventional magnetic head has a structure, in which a MR element and a recording element are stacked. The influence of a recording magnetic field on the magnetically sensitive portion of a reproduction element is lessened and the performance of the MR element is ... | 09/18/2007 |
| 7268968 | Vibration suppression for servo control Embodiments of the present invention provide a way to modify the controller of a HDD head actuator to increase the error rejection capability and suppress the wideband vibration that affects the head motion. In one embodiment, a system to suppress influence of an ex... | 09/11/2007 |
| 7265921 | Method to increase the amount of customer data on a hard disk drive Format efficiency of a hard disk of a hard disk drive having a rotary actuator and a read/write head having a read element that is offset from a write element is improved by writing a data track having a length that is based on an arc of the rotary actuator, the rad... | 09/04/2007 |
| 7265933 | Disk drive computing repeatable run out while actuator arm is pressed against crash stop A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centr... | 09/04/2007 |
| 7256558 | Brushless motor and disk drive device using the same A brushless motor according to the present invention provided with a recording disk in a rotational member and serving to rotate the recording disk together with the rotational member comprises a first position detecting means for detecting a rotational position of ... | 08/14/2007 |
| 7251109 | Magnetoresistive head A magnetoresistive head includes a first magnetic shield, a first electrode terminal arranged on the first magnetic shield at an entry side of a magnetic field from a carrier, a third electrode terminal that is spaced from the first electrode terminal, and arranged ... | 07/31/2007 |
| 7248429 | Adaptive settling control method and apparatus in track seek mode of disc drive A settling control method and apparatus perform an improved settling control regardless of a seek distance when a disc drive track seek control operation is performed. An adaptive settling control method used in controlling the track seek mode of the disc drive incl... | 07/24/2007 |
| 7227708 | System and method for determining long-range erasure of adjacent tracks in hard disk drive A method for identifying victim tracks distanced from an aggressor track in a hard disk drive that are deleteriously affected by long range fringe effects causing adjacent track interference (ATI) when the aggressor track is written includes writing first and second... | 06/05/2007 |
| 7211982 | Variable-structure diagnostics approach achieving optimized low-frequency data sampling for EMA motoring subsystem The present invention provides a diagnostics methodology and embedded electronic system that allows optimized low-frequency data sampling for EMA motoring subsystems in an operating vehicle. Each of the EMA motoring subsystems includes: an EMA; at least one motor fo... | 05/01/2007 |
| 7209312 | Self-servo-write using ramp-tracks Systems and techniques relating to writing servo information on a machine-readable medium. A technique includes forming servo information using a band of ramp-tracks generated based on a mechanical characteristic of a storage device. This can involve writing the ban... | 04/24/2007 |
| 7209311 | Data storage device and control method therefor to prevent off-track writing Embodiments of the invention provide control of a disk data storage device to prevent off-track writing. In one embodiment, the SA acquires the CYLIDs and ADC Values generated from the SERVO SIGNALs acquired previously, and generates DACOUT which defines a driving c... | 04/24/2007 |
| 7203023 | Magnetic recording unit and magnetic recording medium The present invention provides a magnetic recording unit, including: a magnetic head; a magnetic recording medium having a servo pattern for adjusting a position of the magnetic head; a frequency detecting element for detecting a frequency in the servo pattern on a ... | 04/10/2007 |
| 7196859 | Processing techniques for time-based servo patterns Techniques are described for accurately processing playback signals of time-based servo patterns recorded on a data storage medium. In particular, techniques are described for determining values for signal peaks within a playback signal of a time-based servo pattern... | 03/27/2007 |
| 7196861 | Method of evaluating positioning accuracy of a magnetic head tester A method of evaluating the positioning accuracy of a magnetic head tester can accurately test magnetic heads and so can reliably provide non-defective goods. In a method of evaluating the positioning accuracy of a magnetic head tester that tests the performance of a... | 03/27/2007 |
| 7193807 | Method and apparatus for reducing effective track width through highly skewed head angles A disk drive provides increased read and write element widths and tolerances, and also provides reduced track widths. The head with the read and write elements has a large skew angle relative to the tracks on the disk. The skew angle reduces the effective width of t... | 03/20/2007 |
| 7177110 | Systems and rotatable media for increasing the usable position error signal (PES) region Systems for writing preferred servo patterns, and rotatable storage media including preferred servo patterns, are provided. Systems for controlling write currents to produce servo bursts having a desired width are also provided. In accordance with specific embodimen... | 02/13/2007 |
| 7177109 | Methods for increasing the usable position error signal (PES) region Methods are provided for selecting write elements, that can be used in a media-writer, for writing servo burst patterns that have a desired width. Methods for writing preferred servo patterns are also provided. Methods for controlling a write current to produce serv... | 02/13/2007 |
| 7161753 | Modulation of sidewalls of servo sectors of a magnetic disk and the resultant disk A discrete-track-recording (DTR) disk (also called “patterned” disk) has a sectored servo formed by modulation of its sidewalls in a predetermined manner, whereas sidewalls of data sectors are not modulated in this manner. Each servo sector has two side walls th... | 01/09/2007 |
| 7160146 | Connector insulating boot for different sized conductors and associated methods An electrical connector may include a conductive body having a conductor receiving passageway therein to receive the conductor of a cable end. The conductive body may also have a fastener receiving passageway intersecting the conductor receiving passageway, and a fa... | 01/09/2007 |
| 7158338 | Servo track having periodic frames of tone field and embedded synchronization marks Methods and systems for sensing a position of a transducer head with respect to a storage medium. One method includes generating a read signal from a servo track stored on a magnetic storage medium. The servo track includes servo frames of magnetic flux transitions ... | 01/02/2007 |
