Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 8107188 | Self servo writing disk controller and methods for use therewith A self servo writing disk controller detects a plurality of spiral sync marks and a plurality of spiral bursts corresponding to one of a plurality of servo spirals from a read signal from the read/write head. A timing reference signal is generated based on timing of... | 01/31/2012 |
| 7843662 | Servoing on concentric servo sectors of a first disk surface to write a spiral servo track to a second disk surface A disk drive is disclosed comprising a first disk surface and a second disk surface, wherein the first disk surface comprises a plurality of concentric servo sectors extending across substantially an entire radius of the first disk surface. The concentric servo sect... | 11/30/2010 |
| 7813077 | Apparatus, system, and method for detecting a periodic sequence of servo signals An apparatus, system, and method are disclosed for detecting a periodic sequence. A value detector module detects a plurality of values of a periodic sequence. In one embodiment, a transformation module transforms the plurality of values into transformed values. A c... | 10/12/2010 |
| 7724467 | Storage device, control circuit for storage device, and servo-write-mode identifying method A servo-mark search control unit detects in a magnetic disk a servo mark matching a servo mark selected by a servo-mark candidate selecting unit. In this case, according to an instruction from a servo-mark search control unit, a non-volatile memory managing unit wri... | 05/25/2010 |
| 7564644 | Adaptive disturbance repressing method and apparatus, and disk drive apparatus using the same A method and apparatus to safely repress disturbances from being applied to a system from the surroundings in which the system is used. The method of adaptively repressing disturbances includes estimating frequency components of a disturbance applied to a system in ... | 07/21/2009 |
| 7468859 | Voice coil motor effective resistance determination A method of determining a correction factor for a voice coil motor of a disk drive device is performed by driving a relatively low current through the voice coil motor during a seek operation. Actuator velocity is then measured. A correction factor is calculated as ... | 12/23/2008 |
| 7463445 | Method of controlling track seek in HDD and a recording medium therefor Provided is a hard disc drive controlling method, and more particularly, a method of controlling track seek in a hard disc drive (HDD) provided against a shift between discs, and a computer readable recording medium having embodied thereon a computer program for the... | 12/09/2008 |
| 7375918 | Method of self-servo writing in a disk drive using multiple timing windows A disk drive includes a head and a disk, spiral patterns are located on the disk, and the disk drive self-writes servo patterns on the disk using the spiral patterns as a reference for servoing the head. In an embodiment, the disk drive uses preliminary servo patter... | 05/20/2008 |
| 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 |
| 7365927 | Eccentricity correction data recording method and recording medium having eccentricity correction data An eccentricity correction data recording method, a disk-shaped recording medium, a head position control method and an information recording and reproducing apparatus are disclosed for effective eccentricity correction on cylinders of a disk-shaped recording medium... | 04/29/2008 |
| 7359141 | Servo control method, apparatus using the same, and recording medium having program for executing the method The sequential seek method includes calculating a seek length by comparing a cylinder number of a current track with a cylinder number of a target track; checking if the seek length corresponding to a cylinder number is equal to or smaller than 2; calculating a seek... | 04/15/2008 |
| 7359133 | Magnetic recording medium and drive apparatus therefor A flexible recording medium, which has a track width in the range of approximately 1-3 μm, capable of facilitating good tracking control. A magnetic pattern bearing servo signals is provided on the guard bands formed on both sides of a data track of a magnetic reco... | 04/15/2008 |
| 7355808 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 04/08/2008 |
| 7339761 | Method for wedge time shift calibration in a disk drive A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in response to a spindle control current generated by a spindle control syste... | 03/04/2008 |
| 7333287 | Head position control method and disk apparatus A head position control method controls a position of a head of a first apparatus with respect to a disk which has been formed with a track and has been recorded with servo information including position information in servo frames by a second apparatus that is diff... | 02/19/2008 |
| 7334081 | System and method for optimizing sequential XOR command performance An RPO algorithm in a HDD coalesces LBA-sequential XOR commands in pipes, and passes the pipes to a lower level execution engine. The execution engine executes XOR reads and write separately to optimize performance using head and/or cylinder skew information to appr... | 02/19/2008 |
| 7333285 | Method of and apparatus for detecting actuator vibration in hard disc drive, and hard disc drive write control method of avoiding effect due to read/write head vibration A method of and an apparatus for detecting an actuator vibration, and a hard disc drive write control method of avoiding an effect due to the actuator vibration. The method of detecting an actuator vibration includes: obtaining a specified number of position error s... | 02/19/2008 |
| 7330331 | Repeatable runout estimation in a noisy position error signal environment A system and method for estimating repeatable runout in a servo control system, such as a disc drive servo loop, is provided. The system includes a Kalman filter that is configured to receive position error signals from the servo control system and to estimate the r... | 02/12/2008 |
| 7330321 | Reference magnetic signal recording device and method of manufacturing the same A method of simultaneously recording multiple reference magnetic signals by using a magnetic head having multiple recording portions is provided. A writing yoke formed of a ferromagnetic material thin film and a back yoke are provided to a side wall of a slider, whi... | 02/12/2008 |
| 7324300 | Head position control method, head position control device and disk device A head position control device controls the position of a head with respect to a disk where post code is assigned to a servo frame. Servo frames of a disk is constituted by a servo frame not having a post code recorded in an inner side zone and a servo frame having ... | 01/29/2008 |
| 7319567 | Servo sector in magnetic disk drive Embodiments of the invention lower the servo sector's share of each track and ensure that servo sector numbers are reliably determined. According to the embodiment, in the servo sector number (SSA) section of each servo sector, servo sector number information whose ... | 01/15/2008 |
| 7307810 | Method of compensating for track address discontinuity across servo track writing boundary in hard disk drives A hard disk drive with a circuit that provides a current to a voice coil motor to move a head over a disk in a seek routine. The disk has track boundaries with discontinuities in track addresses. The circuit includes a state estimator that predicts a next state of t... | 12/11/2007 |
| 7286319 | Disk drive write control by servo gain A method of controlling a disk drive is disclosed that is capable of precise and real-time detection of an abnormal floating height of a magnetic head over an entire area of a magnetic disk. The method of controlling the disk drive includes the steps of: calculating... | 10/23/2007 |
| 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 |
| 7280309 | Access performance adjusting method and storage apparatus An access performance adjusting method is adapted to a storage apparatus having a storage to prestore a skew quantity that is used to shift a data write starting position of each track of a recording medium depending on a head moving time required to move a head fro... | 10/09/2007 |
| RE39831 | Method and apparatus for providing positional information on a disk The present invention is a method and apparatus for providing positional information of a disk. The disk has at least one side with a plurality of tracks, each having a first burst in a first servo field and a second burst in a second servo field. The first burst pr... | 09/11/2007 |
| 7265937 | Positioning of a head array over a data storage medium A data storage system in which multiple readback signals are resolved is provided. The data storage system includes a data storage medium configured to store servo marks and data marks. The data storage medium has tracks that are divided into sectors. An array of he... | 09/04/2007 |
| 7251097 | Written-in error compensation method for coherent repeatable runout The present invention recognizes that induced RRO is coherent, i.e., the RRO has a large degree of repeatability from track to track. The present invention is a zero acceleration profile (compensation) process that targets CRRO (Coherent RRO). A process of the prese... | 07/31/2007 |
| 7248427 | Method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface The present invention is directed to a method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface of a disk drive. In one embodiment, a servo track writer is provided for moving a write head at a controlled velocity. ... | 07/24/2007 |
| 7242546 | Determining a location based on a cyclic bit sequence containing consecutively-placed identical bit-groups A location within a cycle is determined by reading a portion of a cyclic bit sequence, the bit sequence containing several interspersed bit-group sets that each contain a plurality of series that each consist of several consecutively-placed identical bit-groups. On ... | 07/10/2007 |
| 7242551 | Method for inspecting track pitch in a magnetic disk Embodiments of the invention provide techniques to inspect the track pitch of a magnetic disk. In one embodiment, the track pitch is inspected using the servo information that was written onto the magnetic disk. A PES gain is set to be PG0. A head is moved to... | 07/10/2007 |
| 7224548 | Determining contact write current in disk drive using position error signal variance In a disk drive, a contact write current that causes head-disk contact due to pole tip protrusion is detected using a variance of a position error signal (PES). A method of determining the contact write current includes generating PES's in response to the head readi... | 05/29/2007 |
| 7215496 | Disk drive having adaptively-sized sectors to compensate for disk eccentricity A disk drive includes an actuator assembly having a read/write head, a spindle motor, a disk mounted for rotation on the spindle motor, a wedge-to-wedge timer and a sector size selector. The disk includes a recording surface having a plurality of tracks and each tra... | 05/08/2007 |
| 7212374 | Disk drive to characterize misaligned servo wedges Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein th... | 05/01/2007 |
| 7212363 | Magnetic disk apparatus A magnetic disk apparatus formats a single data frame as a single sector. The magnetic disk apparatus includes a read-out control unit that controls to read-out sector data by emulating an existing format (e.g., “512 bytes/sector”), and a write-in control unit t... | 05/01/2007 |
| 7199960 | Disk drive with AC exciter for head/disk interface A disk drive includes a disk for storing information, a head with a transducer that writes data to and reads data from the disk, and an AC power source. The head is suspended adjacent to the disk and a flying height gap exists at the head/disk interface. The AC powe... | 04/03/2007 |
| 7193800 | Data recording medium with servo pattern having pseudo-noise sequences A data recording medium has tracks with pseudo-noise (PN) sequences with good autocorrelation properties as servo information for controlling the position of the recording head. A first set of alternating tracks uses a leading pseudo-random binary sequence (PRBS), w... | 03/20/2007 |
| 7184230 | System and method for processing track identifier errors to mitigate head instability in data storage devices A system and method for processing track identifier errors to mitigate head instability in data storage devices is disclosed. The system and method includes computing a track id differential between an expected track id and a received track id, encoding the expected... | 02/27/2007 |
| 7181294 | Vibration control device A control device for controlling the motion of a movable part in a machine while suppressing vibration generated in the movable part. The control device includes a state-variable estimating section for estimating a state variable of a controlled system in the machin... | 02/20/2007 |
