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| Number | Title | Issue Date |
| 8159774 | Disk device and offset control method thereof According to one embodiment, a disk device comprises a memory, detector, calculation module, and deactivation module. The memory is configured to store an offset control amount at a time of manufacture. The detector is configured to detect a disk run-out. The calcul... | 04/17/2012 |
| 8154822 | Analog techniques to decode signals extracted from computer-readable storage media Methods, apparatuses, and systems implementing analog techniques to decode signals extracted from servo wedges of computer-readable storage media. A digital signal representing a repeatable runout (RRO) signal included in an analog signal of a computer-readable stor... | 04/10/2012 |
| 8120871 | Method and apparatus for reducing repeatable runout in storage systems A method and apparatus is described for reducing RRO in storage systems. A disc may be partitioned into a number of equally spaced sectors. An RRO profile may be individually obtained for each sector, a runout control algorithm may be applied to each sector to gener... | 02/21/2012 |
| 8094405 | Repetitive error correction method for disk-drive servo control systems Methods, systems and computer program products for compensating repeatable run-out (RRO) are described. In some implementations, RRO may be compensated by predicting the RRO and subsequently subtracting the predicted RRO from the actual value of the RRO to cancel ou... | 01/10/2012 |
| 8068307 | Position control apparatus and disk apparatus using the same According to one embodiment, a position control apparatus includes: a digital control module that performs position control including disturbance adaptive control with a predetermined sampling period with the use of a control constant, in accordance with a position ... | 11/29/2011 |
| 8059360 | Disk drive compensating for radial phase change of repeatable position error due to servo writing from spiral tracks A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of tracks, wherein the servo sectors are written to the disk by servoing off of spiral tracks. The head is positioned over a target track in... | 11/15/2011 |
| 8054574 | Method of measuring non-coherent runout for a disk drive In a disk drive, a modified adaptive runout compensation algorithm is employed to measure non-coherent repeatable runout (RRO) of a track. The adaptive runout compensation algorithm is used to control the transducer head to follow the average RRO of adjacent tracks ... | 11/08/2011 |
| 8049987 | Position control apparatus and disk apparatus using the same According to one embodiment, a position control apparatus includes: a digital control module that performs position control including disturbance adaptive control with a predetermined sampling period using a control constant, in accordance with a position error betw... | 11/01/2011 |
| 8045287 | Self-servo-write method with repeatable runout compensation A system including a self-servo-write, a position measuring module, and a compensation module. The self-servo-write module is configured to position a head of a hard disk drive to write a first set of servo wedges on a magnetic medium of the hard disk drive. The pos... | 10/25/2011 |
| 7995304 | Circuits that use a postamble signal to determine phase and frequency errors in the acquisition of a preamble signal In a servo control loop, phase detection between a clock signal and servo burst fields on a movable storage media is carried out with compensation for phase error and frequency error in the timing of servo burst fields. ... | 08/09/2011 |
| 7961422 | Disk drive computing data center off-track from repeatable runout of write servo track and read servo track A disk drive is disclosed comprising a disk having a plurality of servo tracks that define a plurality of data tracks, and a head actuated over the disk by a voice coil motor (VCM), wherein the head comprises a read element offset radially from a write element. The ... | 06/14/2011 |
| 7940489 | Method and apparatus for repeatable run-out compensation A control system is configured to receive an input signal. The control system includes a control module to generate an output signal that tracks the input signal to the control system. The output signal includes a repeatable disturbance component. A compensation mod... | 05/10/2011 |
| 7933091 | Magnetic disk drive and control method thereof Embodiments of the present invention provide a magnetic disk drive capable of easily suppressing degradation of position error caused by disturbance resulting from vibration from the outside. According to one embodiment, the magnetic disk drive acquires, during a pe... | 04/26/2011 |
| 7903367 | Apparatus, system, and method for repeatable runout cancellation An apparatus, system, and method are disclosed for the cancellation of repeatable runout signals. A signal processing module receives a position error signal and outputs a position compensated signal. A feed forward module receives the position error signal and outp... | 03/08/2011 |
| 7894156 | Determination of wedge offset correction values for a disk drive In a disk drive, a wedge-based scheme is used to determine wedge offset correction values for a track of the disk drive. Correction values for the offset of each servo wedge are calculated wedge-by-wedge, based on the position error signal (PES) of the most recently... | 02/22/2011 |
| 7889453 | Repeated runout error compensation using iterative feedback Various embodiments of the present invention are generally directed to adaptively determining an updated repeated runout (RRO) correction value to correct for RRO error in the placement of a servo seam, by iteratively combining a weighted initially estimated RRO cor... | 02/15/2011 |
| 7869157 | Magnetic disk drive having dual actuator In a dual-stage actuator magnetic drive having a coarse actuator and a fine actuator, an amplitude level of a command signal for the fine actuator during a decoupling-path control depends on a gain of an applied fine actuator model. The fine actuator model gain depe... | 01/11/2011 |
| 7869156 | Method of creating correction table for head position control, head position control method, and disk device A head position control method controls the position of a head by correcting components synchronizing rotation of a disk based on the head control amount. A correction signal for components synchronizing rotation is generated by using a filter function. The filter f... | 01/11/2011 |
| 7855851 | Storage device A magnetic disk device includes a head that reads position information, a position-information correction value for correcting the position information, and an error correcting code for the position-information correction value from a storage medium; a microcontroll... | 12/21/2010 |
| 7835107 | Self-servo-write method with repeatable runout compensation A system includes a servo writing module, a position measuring module, and a compensation module. The servo writing module writes a first set of servo wedges on a magnetic medium of a hard disk drive (HDD) using a head of the HDD. The position measuring module measu... | 11/16/2010 |
| 7826168 | Method of creating correction table for head position control, head position control method, and disk device A head position control method controls the position of a head by correcting components synchronizing rotation of a disk based on the head control amount. A correction signal for components synchronizing rotation is generated by using a filter function. The filter f... | 11/02/2010 |
| 7787210 | Feed-forward method for repeatable runout cancellation A magnetic hard disk drive includes a method for eliminating that portion of track following error by a read/write transducer that is caused by repeatable runout of the disk tracks. The repeatable runout is eliminated by application of an iterative algorithm that ca... | 08/31/2010 |
| 7787209 | Method and apparatus for compensating for repeatable runout using wide embedded runout correction fields A method and apparatus for compensating for repeatable runout using wide embedded runout correction fields is provided. In one embodiment, a disk surface is provided with a write head associated therewith. The disk surface has a data track having a width. An embedde... | 08/31/2010 |
| 7777982 | Disturbance compensation determination apparatus, a related method, a computer-readable medium storing a computer program related to the method, and a disk drive comprising the apparatus A disturbance compensation determination apparatus, a related method, a computer readable medium storing a computer program related to the method, and a disk drive comprising the apparatus are provided. The disturbance compensation determination apparatus includes a... | 08/17/2010 |
| 7764459 | Method, medium, and apparatus optimizing repeatable run-out compensators A hard disk drive optimization method, medium, and apparatus, particularly, a method, medium, and apparatus optimizing the number and gains of RRO compensators for the hard disk drive apparatus. The PRO compensation method can includes measuring the magnitude of a p... | 07/27/2010 |
| 7706100 | Storage apparatus, storage control circuit, and head-position-displacement measuring method A measurement recording unit causes the head to move across a predetermined amount, at least more than one track during one lap of track, with a predetermined radial position and a track position of the magnetic disk being taken as recording start points, thereby wr... | 04/27/2010 |
| 7688541 | Apparatus, system, and method for repeatable runout cancellation An apparatus, system, and method are disclosed for the cancellation of repeatable runout signals. A signal processing module receives a position error signal and outputs a position compensated signal. A feed forward module receives the position error signal and outp... | 03/30/2010 |
| 7663835 | System and method for identifying track squeeze errors (TSEs) of a disk of a disk drive A system and method for efficiently identifying track squeeze errors (TSEs) of a disk of a disk drive during a testing process for the disk drive is disclosed. The method includes reading servo bursts from a track of the disk, utilizing a modeled scan variable, and ... | 02/16/2010 |
| 7656605 | Method for repeatable run-out compensation A control system that includes repeatable run-out (RRO) compensation comprises a control module that determines an error of the control system. An RRO compensation module receives the error, determines a repeatable component of an output response of the control syst... | 02/02/2010 |
| 7646560 | Positioning control system and positioning control method There is provided with a positioning control system including: a head moving unit; a position detecting unit detecting a head position at predetermined time intervals; an error detecting unit detecting a position error of the head for a target position; a disturbanc... | 01/12/2010 |
| 7643241 | Methods calculating RRO and RRO compensation value in HDD Provided are a method of calculating repeatable runout (RRO) of a hard disk drive (HDD) in a frequency domain, a method of calculating a compensation value using the RRO calculating method, and recording media used therefore. The method of calculating RRO in a disk ... | 01/05/2010 |
| 7639447 | Servo track squeeze compensation in a disk drive A disk drive that compensates for written-in track squeeze errors (TSEs) during track following is disclosed. The disk drive may be used to compensate for TSEs when determining the position error signal (PES) by implementing operations that include: determining a tr... | 12/29/2009 |
| 7633705 | Method and apparatus for determining disk-runout information in a disk drive According to one embodiment, a disk drive has a disk, a CPU and a memory. The CPU measures servo intervals between the servo areas provided on the disk, and calculates changes of the servo intervals, which have resulted from a temperature change. The CPU detects a d... | 12/15/2009 |
| 7595953 | Magnetic recording disk drive with switchable compensation for mechanical and electrical disturbances A magnetic recording disk drive has compensation for both mechanical disturbances and electrical disturbances. The disk drive's servo control system includes mechanical disturbance (MD) feedforward compensation and electrical disturbance (ED) feedforward compensatio... | 09/29/2009 |
| 7589930 | Zone based repeated runout error compensation Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is d... | 09/15/2009 |
| 7583470 | Disk drive writing wedge RRO data along a sinusoidal path to compensate for reader/writer offset A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of servo sectors. The disk drive further comprises a head having a read element offset from a write element by a reader/writer offset. The read element ... | 09/01/2009 |
| 7580218 | Magnetic head tester using magnetic disk with pre-written servo A method for operating a head testing apparatus (spin stand) using a mounted hard disk that has had its servo track information pre-written in an external servo-writing apparatus rather than in the testing apparatus itself. This insures more accurate servo-track wri... | 08/25/2009 |
| 7576941 | Disk drive writing wedge RRO values in a butterfly pattern A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate... | 08/18/2009 |
| 7564642 | Apparatus, system, and method for repeatable runout cancellation using ring of integrators An apparatus, system, and method are disclosed to cancel repeatable runout signals. A linear causal system having an impulse response receives a cancellation signal and outputs a position error signal. An inverse matrix module multiplies the position error signal by... | 07/21/2009 |
| 7564643 | Head position control device and medium storage device A head position control device uses a current observer control which performs two degree of freedom control, with which a current step difference due to the difference of eccentricities between heads is prevented without affecting the seek waveform after switching h... | 07/21/2009 |
