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| Number | Title | Issue Date |
| 8184393 | Self-servo-write using ramp-tracks Systems and techniques relating to writing servo information on a machine-readable medium. An apparatus can include a self-servo-write controller configured to direct writing of at least two bands of ramp-tracks to different surfaces of at least one machine-readable... | 05/22/2012 |
| 8085492 | Helicoid group switching The present disclosure includes systems and techniques relating to magnetic recording devices, such as disk drives. A recording medium of a magnetic recording device can include multiple helicoid patterns arranged in multiple helicoid groups. A described technique i... | 12/27/2011 |
| 8023220 | Method for writing servo data to a disk and disk drive configured to write servo data utilizing the method A method for writing servo sector sets that include a plurality of separate servo sectors on a disk so that servo sectors are present at same circumferential positions but different radial positions. The method includes reading a first servo sector set in a track wi... | 09/20/2011 |
| 7933092 | Method and apparatus for estimating a position of a head in a disk drive In a method for providing an estimate of a head position for a disk drive, a readback signal is filtered. The readback signal includes a first position signal component corresponding to a first position pattern on a disk, and includes a second position signal compon... | 04/26/2011 |
| 7876523 | Disk drive initializing position feedforward compensation with velocity feedforward compensation A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval. The head is positioned over the disk and used to... | 01/25/2011 |
| 7869158 | Helicoid group switching A recording medium can include multiple helicoid patterns arranged in multiple helicoid groups, e.g., first and second helicoid groups. Operating a disk drive can include switching between helicoid groups to maintain the alignment of the head with respect to a targe... | 01/11/2011 |
| 7852598 | Self-servo-write using sloped tracks written using a calibrated current profile Systems and techniques relating to writing servo information on a machine-readable medium. A method of performing post-assembly operations in a recording apparatus, including a rotating recording medium, includes writing sloped tracks to the recording medium using a... | 12/14/2010 |
| 7813075 | System, method and apparatus for performing metrology on patterned media disks with test pattern areas Techniques for performing metrology on magnetic media disk formations that are arranged in curvilinear patterns are disclosed. Small integrated test patterns having rectangular or hexagonal periodicity are integrated among the concentric circles of patterned media f... | 10/12/2010 |
| 7751144 | Self-servo-write using ramp-tracks Systems and techniques relating to writing servo information on a machine-readable medium. A method includes writing a band of ramp-tracks, including an embedded timing reference, to a machine-readable medium such that each ramp track in the band of ramp-tracks span... | 07/06/2010 |
| 7719788 | Servo information correcting method A operation of storing a post code, which is read from each servo frame on a target track of a disk recording medium, in a memory if an on-track condition for determining that a head is controlled to be positioned on the target track is satisfied is executed. Next, ... | 05/18/2010 |
| 7646561 | Method of writing pattern in disk, method of following track on disk, and apparatus for writing pattern in disk Embodiments of the present invention efficiently perform servo correction for prevention of propagation of a position error in a radial direction in self servo write (SSW). According to one embodiment, in SSW, a target position of a reference track TO in writing a s... | 01/12/2010 |
| 7538967 | Method and apparatus for estimating a position of a head in a disk drive In a method for providing an estimate of a head position for a disk drive, a readback signal is filtered. The readback signal includes a first position signal component corresponding to a first position pattern on a disk, and includes a second position signal compon... | 05/26/2009 |
| 7522370 | 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... | 04/21/2009 |
| 7471484 | Patterned medium and recording head A magnetic recording system includes a patterned medium comprised of land areas and trough areas, a write element which writes the data to the patterned medium, and a read element which reads the data from the patterned medium and servo information from the troughs.... | 12/30/2008 |
| 7440210 | Servo writing a disk drive by writing multi-bit sync marks in spiral tracks for improved servo writing A method of writing spiral tracks on a disk of a disk drive is disclosed. The disk drive comprises control circuitry and a head disk assembly (HDA) comprising the disk, an actuator arm, a head coupled to a distal end of the actuator arm, and a voice coil motor for r... | 10/21/2008 |
| 7433143 | Adjusting track density by changing slope of spiral tracks used to servo write a disk drive A method and apparatus is disclosed for adjusting the track density by changing the slope of spiral tracks used to servo write a disk drive. A target track density is established for a disk surface, and a plurality of spiral tracks are written to the disk surface in... | 10/07/2008 |
| 7430092 | Control apparatus, storage apparatus, and computer product Offtrack amounts corresponding to every servo in which data writing has been completed is stored in a storage unit. Offtrack amount corresponding to a next servo frame, which is a servo frame present next to a servo frame for which data has been written, is calculat... | 09/30/2008 |
| 7420763 | Disk drive control circuit and method A servo control circuit provides seamless transition between seek and track modes while enabling both rapid seek mode operation and accurate tracking. The control circuit includes an analog-to-digital converter having a non-linear characteristic. The non-linear char... | 09/02/2008 |
| 7411758 | Disk drive servo control using spirals A servo control system includes a peak detection module that detects peak times of spiral signals generated by reading spirals prewritten on a magnetic medium. The servo control system includes a control module that determines positions of the spirals based on the p... | 08/12/2008 |
| 7408735 | Data tracking method and apparatus for disk-based data storage A method and apparatus for dealing with undesired deviations of servo burst component magnitudes, as compared with nominal magnitudes, is provided. Inaccurate servo burst magnitudes can arise from components which are misplaced, often from an inaccuracy in a trimmin... | 08/05/2008 |
| 7405898 | System and method for generating a position error signal (PES) reference curve in a data storage device System and method for generating a Position Error Signal (PES) reference curve in data storage devices are provided. The method includes scanning a distance of at least one Track Pitch (TP) in a cross-track direction in each servo-burst along a predefined path. One ... | 07/29/2008 |
| 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 |
| 7372659 | Head position control method, head position control device and disk device In a head position control device having a disturbance suppression function and eccentricity correction function, the interference between the eccentricity correction function and the disturbance suppression function is prevented. An eccentricity correction function... | 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 |
| 7365932 | Disk drive comprising an optical sensor for vibration mode compensation A disk drive is disclosed comprising an actuator arm, a head attached to a distal end of the actuator arm, a voice coil motor for rotating the actuator arm about a pivot, and an optical sensor operable to generate a first position signal representing a position of t... | 04/29/2008 |
| 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 |
| 7349172 | Certifying concentric data in eccentric servo data tracks of pre-formatted media Apparatus and method for rotating a data storage media having pre-formatted servo data tracks adjacent a data transfer member, and retrieving readback data with the data transfer member along a path that is non-concentric in relation to the servo data tracks. The da... | 03/25/2008 |
| 7330327 | Servo writing a disk drive by writing discontinuous spiral tracks to prevent overheating A method of servo writing a disk for use in a disk drive is disclosed by writing discontinuous spiral tracks on the disk to protect against overheating the head and/or preamp circuitry. A write clock is synchronized to the rotation of the disk, and a plurality of di... | 02/12/2008 |
| 7319570 | Random vibration and shock compensator using a disturbance observer A data storage device adapted to compensate for physical disturbances has a storage medium, a read-write mechanism positionable relative to the storage medium, and a disturbance observer. The read-write mechanism is adapted to read and write data. The disturbance ob... | 01/15/2008 |
| 7315431 | Method to correct radial misposition of data tracks using stitched correction fields A disk drive measures the radial misposition of tracks and repositions the tracks at regularly spaced intervals. Written in runout (WRO) in servo bursts is determined to calculate track spacing and squeeze among adjacent tracks. Tracks with improper spacing are repo... | 01/01/2008 |
| 7292403 | Low frequency disturbance compensation control device and disk drive using the same A servo control device for a disk drive capable of effectively compensating for a low frequency disturbance incoming to the disk drive is provided. The servo control device includes: a state variable estimator calculating a position estimation error based on a contr... | 11/06/2007 |
| 7286318 | Optimization of position mode seeking of a disk drive head based on measured open loop actuator response A disk drive and related methods are provided for tuning the control of an actuator for position mode seeking of a head between tracks on a disk based on a measured open loop response of the actuator. The disk drive includes a rotatable data storage disk, a head, an... | 10/23/2007 |
| 7259927 | Method and apparatus for improving signal-to-noise ratio for hard disk drives A hard disk drive comprising a plurality of read/write heads oriented to serially read data from the magnetic media of the disk drive. The head output signals are delayed and combined to provide a time aligned composite signal for determining the value of the data b... | 08/21/2007 |
| 7253982 | Dynamic shock detection in disk drive using hair trigger timer Dynamically detecting off-track errors in a disk drive by adjusting transducer head position control parameters in response to shock events. In an embodiment, shock events with large magnitude trigger a severe shock timer which lengthens the write fault before write... | 08/07/2007 |
| 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 |
| 7248426 | Servo writing a disk drive from spiral tracks by shifting a demodulation window an integer number of sync mark intervals A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval. The sync marks in the s... | 07/24/2007 |
| 7239481 | Magnetic head having multilayer heater for thermally assisted write head and method of fabrication thereof A magnetic head including a media heating device that is preferably fabricated within the magnetic head structure. The heating device preferably includes an electrical heating element and electrical leads, where an insulation layer disposed above the heating element... | 07/03/2007 |
| 7230786 | Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon The present invention is directed to a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon. A read head is provided for reading the spiral servo information and gener... | 06/12/2007 |
| 7224544 | Method and device for recording data and erasing servo data After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a magnetic field in the direction opposite to that of the DC erasing. ... | 05/29/2007 |
| 7212364 | Servo writing a disk drive by synchronizing a servo write clock in response to a sync mark reliability metric A method of writing product servo sectors to a disk of a disk drive is disclosed. A plurality of spiral tracks are written to the disk, wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. During the pro... | 05/01/2007 |
