Matches 1 - 43 out of 43


Match Document Document Title
US20120154949 BIPOLAR POSITION ERROR BURSTS WITH UNIPOLAR SERVO FIELDS  
A storage medium has a first servo field having magnetic lands separated by nonmagnetic areas, the magnetic lands of the first servo field having a unipolar pattern. The medium further includes a...
US20090086364 PER WEDGE WORF DETERMINATIONS FOR DISK DRIVE  
A method for locating a track on a disk surface having a plurality of wedges of servo information includes demodulating servo information for a first servo wedge, and determining a correction...
US20120275050 DISK DRIVE ADJUSTING ROTATIONAL POSITION OPTIMIZATION (RPO) ALGORITHM TO COMPENSATE FOR REPEATABLE RUNOUT (RRO)  
A disk drive is disclosed comprising a first disk surface comprising a plurality of tracks, wherein each track comprises a number of data sectors and a number of servo sectors, and a second disk...
US20130222943 REPEATABLE RUN OUT COMPENSATION  
An apparatus can include a disk drive controller that includes at least one repeatable run out (RRO) compensator corresponding to a RRO component, the disk driver controller configured to change a...
US20090168226 Repair of defective servo tracks  
A method for repairing at least one defective servo segment of a servo sector having at least one defective servo track written on a magnetic recording media. The method comprises mapping the...
US20100328813 DISK-ENCLOSURE COVER FOR LOW-PROFILE, HARD-DISK DRIVE  
A disk drive. The disk drive includes a head, a motion mechanism, and a controller. The head is configured to access a disk configured to store data. The motion mechanism is configured to move the...
US20110075292 LOG-STRUCTURE FILE SYSTEM FOR DISK DRIVES WITH SHINGLED WRITING  
Data is written to a hard disk drive using shingled writing principles, i.e., each data track is partially overwritten when an immediately contiguous data track is written. One or more contiguous...
US20120087036 Patterned media with offset PES servo segments with length encoded track position  
Patterned discrete track magnetic media compatible with the constraints imposed by the use of self-assembly technology are described in which the PES servo portion of each servo sector has at...
US20050201003 Magnetic disk drive  
In order to achieve narrow track pitch by measuring, storing and compensating common average values for repeatable runout components between adjacent tracks in a head positioning control system...
US20070133120 Magnetic storage device and method of correcting magnetic head position  
A head position is corrected based on track deviation information read from a storage unit that stores the information on track deviation due to an abnormal pitch of a servo track. At the time of...
US20090122440 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...
US20070053098 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....
US20090310250 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...
US20090244768 MAGNETIC HEAD POSITIONING CONTROL METHOD AND MAGNETIC HEAD POSITIONING CONTROL APPARATUS  
N groups of servo patterns, each corresponding to the predetermined number of servo sectors, are recorded in a magnetic disk. The magnetic head positioning control apparatus of the present...
US20050128634 Systems and methods for improved worf calculation  
Wedge Offset Reduction Field (WORF) data can be used to reduce the effective written-in runout of a servo pattern. In order to prevent the WORF data from being applied to an improper portion of...
US20100142085 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...
US20100053799 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...
US20080186618 Architecture for write pre-compensation  
An architecture to compensate for the non-linear effects of magnetic media, such as magnetic disk drives, that distorts data transitions when data is written to the media and in which the...
US20060056101 Controller for a disk, disk enclosure device, disk array apparatus, method for detecting a fault of disk enclosure device, and signal-bearing medium  
A method and structure for a controller for a memory unit includes a switch that provides a first identification code for the memory unit and a comparator that compares the first identification...
US20100302676 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...
US20070183080 Portable electronic device  
A memory to store a state identifier showing whether or not to permit reading out an occurrence number of times of disk shifts from a disk storage unit is newly provided so as to intermittently...
US20090213487 EFFICIENT METHOD TO DETECT DISK WRITE ERRORS  
A write error detection mechanism for a computer data disk drive or storage controller writes and then verifies data to detect disk write errors. It allows the heads to be moved to other tracks to...
US20120147495 METHOD AND APPARATUS FOR REDUCING REPEATABLE RUNOUT IN STORAGE SYSTEMS  
A storage system includes a first buffer configured to store a first repeatable runout profile (RRP) for a sector of a rotating storage medium. A second buffer is configured to store a second RRP...
US20080002282 HARD DISK DRIVE (HDD), METHOD IMPROVING READ HIT RATION IN HDD, AND MEDIUM RECORDING COMPUTER PROGRAM PERFORMING METHOD  
In a method of improving read hits to pre-fetch data stored in a memory associated with a hard disk drive (HDD). The method includes; receiving a read command indicating a target sector on a disk...
US20110085262 DLC-Head Offset Compensation While Writing  
In described embodiments, effects of frequency and phase error introduced at the outer diameter or inner diameter of the disk when a read head is used to maintain timing lock while the write head...
US20080192379 Manufacturing method for magnetic disk drive  
Embodiments of the present invention provide a process that monitors a magnetic playback signal while gradually increasing an electricity supply amount for a heater to thereby determine contact...
US20120250181 DATA STORAGE SYSTEM WITH SELF-SERVO-WRITING AND METHOD OF OPERATION THEREOF  
A method of operation of a data storage system includes: providing a disk having a reference servo; and positioning a read/write head over the disk with the reference servo including: collecting a...
US20100238588 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...
US20090073601 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....
US20110069411 HEAD SERVO CONTROL SYSTEM AND HEAD SERVO CONTROL METHOD  
A servo control system configured to position a head in accordance with position error signals between servo data on a disk read by the head in a servo sampling cycle and a target position. The...
US20080174905 Method and apparatus for recording data on a magnetic recording medium  
A method for recording data on a magnetic recording medium is disclosed. When data are written to a target track Tn, the numbers of effects on tracks Tn−1 and Tn+1 adjacent to a target track are...
US20150109700 SHINGLED MAGNETIC RECORDING SYSTEM WITH ADAPTIVE WRITE BUFFER AREA  
Techniques for writing data to a buffer region of a magnetic disk are described. In one example, a hard disk drive comprises a magnetic disk comprising a data buffer region including a first zone...
US20100246055 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...
US20100149684 DATA-STORAGE DEVICE AND ANALYSIS METHOD FOR DATA-STORAGE DEVICE  
A data-storage device with a security function for user data stored in a data-storage medium. The data-storage device includes: the data-storage medium for storing data; an authentication...
US20100128385 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....
US20170186455 Magnetic Disk Device and Write Method  
According to one embodiment, a magnetic disk device includes a memory, a disk including track groups each including overlapping tracks, a head including a write head, and a read head, and a...
US20160351220 MAGNETIC DISK DEVICE, CONTROL METHOD, AND MANUFACTURING METHOD OF MAGNETIC DISK DEVICE  
According to one embodiment, a magnetic disk device includes a head including a read head and a write head, a disk including a plurality of tracks amounts of eccentricity of which periodically...
US20160267931 DISK DRIVE SENSOR SELECTION  
Implementations described and claimed herein includes a method comprising selecting a zone of one or more tracks on a disk drive having a plurality of magnetic sensors on a transducer head,...
US20160049168 Methods and Apparatus for Improved Pattern Detection  
Improved pattern detection is provided for a predefined pattern in data. A detection threshold employed by a Euclidean detector to detect a pattern (such as a Servo Address Mark) may be adjusted...
US20160012842 METHOD AND APPARATUS FOR DETERMINING READ-HEAD DEVIATION USING ORTHOGONAL PREAMBLES  
A storage device includes read circuitry having a read head having a detector that outputs signals representing data from a first track and an adjacent track. The read head is subject to off-track...
US20150302876 DATA STORAGE APPARATUS AND METHOD FOR CORRECTING REPEATABLE RUNOUT  
According to one embodiment, a data storage apparatus includes a disk configured to be recorded correction information corresponding to radial positions of the disk and variation information...
US20150055239 DATA STORAGE APPARATUS AND METHOD FOR CORRECTING REPEATABLE RUNOUT  
According to one embodiment, a data storage apparatus includes a disk, a head and a controller. In each track, first and second correction values for correcting a track runout in synchronization...
US20120200954 Systems and Methods for Off Track Error Recovery  
Various embodiments of the present invention provide systems and methods for recovering data from a storage medium. As an example, a data recovery circuit is disclosed that includes: a controller...

Matches 1 - 43 out of 43