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| Number | Title | Issue Date |
| 8189286 | Disk drive employing velocity insensitive servo burst pattern A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors that define a plurality of servo tracks. The servo sectors comprise a plurality of servo bursts including a first servo burst, a second servo burst following the... | 05/29/2012 |
| 8116026 | Method and system for head position control in embedded disk drive controllers A track follow controller includes a burst selector selecting at least one burst pair based on burst pair selection data. A linear position calculator calculates a primary head position and a secondary head position based on the at least one burst pair, and calculat... | 02/14/2012 |
| 8098453 | Magnetic storage medium and storage apparatus A magnetic storage medium includes: burst lines each including magnetic bodies placed in a nonmagnetic body in a predetermined repetitive pattern repeated in the radial direction, the burst lines arranged in the circumferential direction at predetermined intervals, ... | 01/17/2012 |
| 8064157 | Burst patterns for magnetic disks and magnetic disk devices A magnetic disk includes: a data recording region having first magnetic parts; the first magnetic parts being arranged in a circumferential direction in the nonmagnetic region and form tracks, and the tracks being arranged in a radial direction at a track pitch Tp; ... | 11/22/2011 |
| 8040631 | Servo processors that alternately control head positioning relative to sequential servo patterns The operational bandwidth of a servo control circuit can be increased using a plurality of servo processors that handoff between them the responsibility for controlling head positioning in response to sequentially occurring servo patterns. ... | 10/18/2011 |
| 8023222 | Information storage device and computer product According to one embodiment, an information storage device includes a recording/reproducing head, a positioning controller, a position detector, a storage module, and a position error detector. The position detector detects the position of the recording/reproducing ... | 09/20/2011 |
| 8023221 | Position gain calibration in disk drives A system including a signal generating module and a position control module. The signal generating module generates position error signals based on servo bursts read from a servo region of a track of a disk drive. The servo bursts are read by a head of the disk driv... | 09/20/2011 |
| 7986488 | Magnetic recording disk and disk drive with alternating single-polarity position error signal (PES) blocks for read/write head positioning A magnetic recording disk drive has a position-error-signal (PES) servo pattern divided into at least two circumferentially adjacent fields that extend radially across the data tracks and include PES blocks that are DC magnetized in one direction, with each PES bloc... | 07/26/2011 |
| 7948708 | Simultaneous bit pattern determination and head positional information detection on patterned media An apparatus, system, and method comprise a magnetoresistive head configured to respond to magnetization states of patterned cells formed on a patterned medium. The magnetoresistive head detects the magnetization states of at least two patterned cells formed on a pa... | 05/24/2011 |
| 7948707 | Magnetic recording medium, method of recording servo pattern on magnetic recording medium, and magnetic head A magnetic recording medium includes a disk substrate and a magnetic recording layer formed on one surface or both surfaces of the disk substrate. The magnetic recording layer includes at least one pattern area forming a plurality of data tracks in which a position ... | 05/24/2011 |
| 7920354 | Phase servo patterns for bit patterned media A recordable medium according to some embodiments includes a servo control field having a bit patterned media (BPM) pattern. The pattern includes a plurality of isolated magnetic islands or dots arranged in a down-track orientation and in a cross-track orientation. ... | 04/05/2011 |
| 7920355 | Method and apparatus for reproducing servo data from a discrete track media in a disk drive According to one embodiment, disclosed herein is a disk drive that has a disk of discrete-track media (DTM) type. The DTM disk has servo regions. Each servo region has dividing grooves and non-servo data parts. Each dividing grooves extends along the centerline of a... | 04/05/2011 |
| 7916422 | Disk drive rotating phase based servo bursts based on radial location of head A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by a plurality of servo sectors, wherein each servo sector comprises a plurality of servo bursts, and each servo burst comprises a predetermined phase. Af... | 03/29/2011 |
| 7898762 | Disk drive excluding servo sub-bursts when computing position error signal A disk drive is disclosed comprising a head actuated over a disk, the disk including a plurality of servo sectors wherein each servo sector comprises at least one servo burst. A read signal emanating from the head is sampled while reading a servo burst in a servo se... | 03/01/2011 |
| 7864486 | Hard disc apparatus and head alignment method According to one embodiment, a hard disc apparatus comprises a disc, wherein areas between neighboring servo areas are allocated to data areas including data sectors, a head module, and a storage module configured to store head alignment data, wherein the head align... | 01/04/2011 |
| 7864485 | Magnetic recording medium, recording and reproducing device, magnetic recording medium-magnetizing method, and magnetic recording medium-magnetizing device A magnetic recording medium enhances the quality of a reproducing signal. The magnetic recording medium has a servo pattern formed in a servo pattern area on at least one surface of a disk-shaped substrate by a concave/convex pattern having convex portions (recordin... | 01/04/2011 |
| 7843661 | Controller with fractional position algorithm One illustrative embodiment of the present invention pertains to a device. The device is configured to evaluate a Gray code value and to provide compensation for error in the Gray code value. Another illustrative embodiment of the present invention pertains to a met... | 11/30/2010 |
| 7830635 | Magnetic recording medium, recording/reproducing apparatus, and stamper On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region. Each burst pattern is formed so as to include two types of burst signal units that have an equal length along a radial dire... | 11/09/2010 |
| 7813076 | Method for estimating position error gain for hard disk drives A hard disk drive with a controller that determines a position error signal gain. The position error signal gain is determined from a total servo loop gain and a function that is defined by a slope of a line of A and B servo bits measured at N off-track positions. T... | 10/12/2010 |
| 7777983 | Apparatus and method for generating a servo pattern A method of writing a servo pattern to a disk, wherein a servo pattern is generated in a processor. The generated servo pattern is then written to a disk. The servo pattern for a servo sector is preferably generated in a single routine. ... | 08/17/2010 |
| 7746595 | Disk drive comprising slanted line servo bursts having reverse polarity segments A disk drive is disclosed comprising a disk having servo data defining a plurality of servo tracks. The servo data comprises a preamble, and a plurality of slanted line servo bursts recorded at a tilt angle with respect to the preamble. At least one of the slanted l... | 06/29/2010 |
| 7719789 | Controlling device, magnetic storage medium, storage device, and method for determining offset amount A magnetic storage medium has tracks and guard bands magnetically separating adjacent tracks. The tracks and the guard bands are alternately and concentrically disposed. The tracks includes a plurality of data tracks in which data can be written and from which data ... | 05/18/2010 |
| 7672075 | Magnetic recording medium, recording/reproducing apparatus, and stamper In a magnetic recording medium including a servo pattern region having a servo pattern formed of a concave/convex pattern having convex portions and concave portions and a data recording region, the region having a data track pattern, the convex portions are formed ... | 03/02/2010 |
| 7656606 | Magnetic recording medium, recording/reproducing apparatus, and stamper A rotary-type magnetic recording medium has servo patterns formed in servo pattern regions on a substrate by patterns including recording regions and non-recording regions. Burst signal units composed of the recording regions or the non-recording regions are formed ... | 02/02/2010 |
| 7616399 | Disk drive servo control techniques to preserve PES continuity A disk drive comprising a moveable head, a disk, and a servo controller that implements servo control techniques to preserve PES continuity during track following operations is disclosed. The disk includes a plurality of tracks in which a substantial majority of the... | 11/10/2009 |
| RE40955 | Method and apparatus for storing position offset information on a hard drive assembly cylinder A method and apparatus for storing position offset information not used for aligning the read element of an MR head with the centerline of written data, during a read operation. The skew or offset between the read and the write elements on a read head is first calib... | 11/10/2009 |
| 7595954 | Disk drive to estimate repeatable runout (RRO) based upon on an optimal mean square estimation (MSE) learning method Disclosed is a method of estimating repeatable runout (RRO) for a disk drive. The method includes: determining a plurality of position error signal (PES) values for a plurality of servo wedges of a track of a disk; and estimating repeatable runout (RRO) in the PES v... | 09/29/2009 |
| 7595955 | Disk drive device and method for error recovery procedure therefor Embodiments of the present invention help to achieve a read error recovery, and suppress decreases in the capacity of the disk drive device and degradation in performance. In one embodiment, a hard disk drive (HDD) performs following control without use of repeatabl... | 09/29/2009 |
| 7576942 | Servo sector format with large lithographic tolerances A method and system determines the position of a transducer head based on permanent servo marks in which the width of the permanent servo marks is greater than the width of the data tracks they are used to identify. The method includes receiving readback signals in ... | 08/18/2009 |
| 7567406 | Method of writing pattern on magnetic disk and device therefor Embodiments of the present invention provide accurate pitch control of a servo write track. A Self-Servo-Write (SSW) according to an embodiment of the present invention determines a reference APC by reading a mark formed on the recording surface corresponding to the... | 07/28/2009 |
| 7561371 | Magnetic disk device, servo-information writing device, magnetic disk, and magnetic disk device manufacturing method A magnetic disk incorporated into a magnetic disk device is divided radially into a plurality of areas. An inner-circumference area has servo information written thereon at a low frequency. An outer-circumference area has servo information written thereon at a high ... | 07/14/2009 |
| 7548394 | Magnetic recording medium and magnetic recording/reproducing apparatus A magnetic recording medium includes a servo area where servo data used for detecting a position of a magnetic head on a magnetic recording medium is recorded; and a writable data area, arranged side by side with the servo area in a track direction, on which user da... | 06/16/2009 |
| 7538968 | Magnetic recording medium and magnetic recording/reproducing apparatus A magnetic recording medium includes a servo area where servo data used for detecting a position of a magnetic head on a magnetic recording medium is recorded; and a writable data area, arranged side by side with the servo area in a track direction, on which user da... | 05/26/2009 |
| 7532430 | Magnetic recording medium and magnetic recording/reproducing apparatus A magnetic recording medium includes a servo area where servo data used for detecting a position of a magnetic head on a magnetic recording medium is recorded; and a writable data area, arranged side by side with the servo area in a track direction, on which user da... | 05/12/2009 |
| 7529059 | Method for determining read/write head position based on phase detection of a servo pattern A method determines RW head radial position relative to tracks within a magnetic data disc. This involves sensing both a S-burst signal and a P-burst signal with the RW head. The S-burst signal and P-burst signal are associated with a two-burst servo pattern on the ... | 05/05/2009 |
| 7525755 | Magnetic recording medium and magnetic recording/reproducing apparatus A magnetic recording medium includes a servo area where servo data used for detecting a position of a magnetic head on a magnetic recording medium is recorded; and a writable data area, arranged side by side with the servo area in a track direction, on which user da... | 04/28/2009 |
| 7502197 | Disk drive demodulating a time-based servo pattern A disk drive is disclosed including a disk having a first and second set of time-based servo patterns. The first set of time-based servo patterns comprises a first cyclical pattern that repeats radially over the disk, and the second set of time-based servo patterns ... | 03/10/2009 |
| 7483235 | Position detecting circuit, information recording apparatus, and magnetic disk device The delay time from the rotation start of a magnetic disk medium (M) to a servo pattern being read is obtained with respect to a radial position from the phase delay that the trajectory of a magnetic head (H) by a rotary actuator causes with respect to the radial di... | 01/27/2009 |
| 7474494 | Magnetic disk device with positioning control In a magnetic disk device, oscillation occurring at a frequency higher than Nyquist frequency is suppressed. In one embodiment, a multi-late filter having a resonance point at a frequency higher than the intended Nyquist frequency is introduced in a previous stage o... | 01/06/2009 |
| 7474493 | Alternative DC-burst servo pattern for perpendicular recording The invention provides a servo pattern that is stable for long time, easily writable, and excellent in S/N. DC-signal area included in a burst area of a servo pattern comprises combination of positive and negative DC-signals, low-density dummy bit, or pattern having... | 01/06/2009 |
