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| Application No. | Application Title | Issue Date |
| 20120127604 | MAGNETIC RECORDING APPARATUS AND DATA READING METHOD A magnetic recording apparatus includes: a magnetic disk; a drive device; a magnetic disk control device; a buffer; and a flag management table. The buffer reads data of a specific block unit from a designated read range on the magnetic disk. The flag management table s... | 05/24/2012 |
| 20120127605 | METHOD AND DEVICE FOR MAPPING THE MAGNETIC FIELD OR MAGNETIC FIELD SENSITIVITY OF A RECORDING HEAD A method and apparatus for scanning a read/write head of a hard disk drive during manufacture are presented. The method includes: providing a magnetic sensor; moving the magnetic sensor relative to and in close proximity to the read/write head under test; obtaining meas... | 05/24/2012 |
| 20120127602 | NOVEL THERMAL ACTUATOR DESIGN FOR THERMAL FLYING HEIGHT CONTROL SLIDER This invention relates to a slider that includes a thermal actuator for controlling the flying height of the slider over a disk in a HDD. The thermal actuator comprises a thermal insulator, a thermal heater and a thermal conductor. The thermal heater is proximate a bott... | 05/24/2012 |
| 20120127603 | MAGNETIC TUNNEL JUNCTION HAVING A MAGNETIC INSERTION LAYER AND METHODS OF PRODUCING THE SAME According to one embodiment, a magnetic head includes a barrier layer having a crystalline structure, a first magnetic layer above the barrier layer, a magnetic insertion layer above the first magnetic layer, and a second magnetic layer above the magnetic insertion laye... | 05/24/2012 |
| 20120105999 | INTEGRATED TOUCH-DOWN PAD AND TOUCH-DOWN SENSOR In one general embodiment, a magnetic head includes a touch-down pad, comprising at least one shielding element positioned between a leading edge of a main magnetic pole and a trailing edge of a lower return pole; an embedded contact sensor (ECS) in an electrically isol... | 05/03/2012 |
| 20120106000 | HEAD POSITION CONTROL METHOD AND DISK DEVICE A track locus drawn on a disk discretely contains repeatable runout (RRO) components which are large in amplitude up to high-frequency band. In order to position a magnetic head along the track locus using filters good at suppressing RRO with resonance characteristics o... | 05/03/2012 |
| 20120081812 | System and Method for Improved Free Fall Detection An information handling system includes a free fall sensing system having an amplifier and sampling circuit, a sampling data analyzer, a sampling clock duration controller, and a sampling clock generator. The amplifier and sampling circuit is configured to sample data s... | 04/05/2012 |
| 20120081810 | MAGNETIC DISK DRIVE USING OFFSET IN POSITIONING HEAD TO READ DATA AND HEAD POSITIONING METHOD According to one embodiment, a magnetic disk drive comprises a write count memory, a read offset setting module and a controller. The write count memory stores a write count for each track or for each zone on a disk. The read offset setting module sets, in accordance wi... | 04/05/2012 |
| 20120050904 | METHOD AND APPARATUS FOR COMPENSATING FOR DISTURBANCE AND DISK DRIVE EMPLOYING THE SAME A method and apparatus for compensating for a disturbance by detecting a periodic external disturbance applied to a data storage apparatus is provided. The method includes: calculating a correlation coefficient for a first signal corresponding to a first period and a se... | 03/01/2012 |
| 20120044595 | PERPENDICULAR MAGNETIC RECORDING MEDIUM (PMRM) AND MAGNETIC STORAGE SYSTEMS USING THE SAME In one embodiment, a perpendicular magnetic recording medium (PMRM) includes a first interlayer comprising Ru or a Ru alloy, a second interlayer above the first interlayer comprising Ru or a Ru alloy, and a third interlayer formed between the first interlayer and the se... | 02/23/2012 |
| 20120038999 | APPARATUS AND METHOD FOR RECEIVING AND POSITIONING A READ/WRITE HEAD TO A DISK FOR TESTING AND METHOD OF REMOVING A TESTED READ/WRITE HEAD FROM A TEST APPARATUS An apparatus for receiving and positioning a read/write head to a disk and related methods are disclosed. The apparatus includes: a deck; a spindle on the deck; a safety enclosure surrounding at least the spindle; and a movable carriage having at least one head receivin... | 02/16/2012 |
| 20120038998 | Systems and Methods for Phase Offset Based Spectral Aliasing Compensation Various embodiments of the present invention provide systems and methods for phase offset based spectral aliasing compensation. For example, a circuit for spectral aliasing reduction is disclosed that includes a phase shift circuit operable to phase shift an analog inpu... | 02/16/2012 |
| 20120033323 | Systems and Methods for Servo Data Based Harmonics Calculation Various embodiments of the present invention provide systems and methods for servo data based harmonics calculation. For example, a circuit for determining harmonics is disclosed that includes an analog to digital conversion circuit that provides a series of digital sam... | 02/09/2012 |
| 20120026621 | MAGNETIC DISK APPARATUS AND SLIDER CONTROL METHOD In one embodiment, there is provided a magnetic disk apparatus. The apparatus includes: a recording medium including a recording surface for recording information; a slider including a head configured to write information to the recording medium or read information from... | 02/02/2012 |
| 20120019955 | HARD DISK DRIVE, METHOD FOR ESTIMATING BACK ELECTROMOTIVE FORCE, AND METHOD FOR CONTROLLING VELOCITY OF HEAD According to one embodiment, a hard disk drive includes a head, a voice coil motor, a driving circuit, an identification unit, a storage unit, and an estimation unit. The head is configured to perform write/read of information to a storage medium. The voice coil motor i... | 01/26/2012 |
| 20120019956 | ADJUSTING A TRANSDUCER HEAD FOR TRANSFERRING DATA A transducer head apparatus (140) is disclosed for concurrently transferring data relative to a plurality of tracks on a data carrier. The head apparatus comprises a body (310) extending longitudinally, the body supporting a plurality of longitudinally spa... | 01/26/2012 |
| 20120019954 | METHOD AND APPARATUS FOR BIPOLAR SERVO MARKS WRITING WITH HIGH OUTPUT A method and apparatus for bipolar servo marks writing with high output. The method includes providing a servo write head having first and second write gaps; and applying a varying current comprising either (i) abrupt changes in current in combination with current ramps... | 01/26/2012 |
| 20120019945 | Method and system for measuring noise of a magnetic head A method for measuring noise of a magnetic head includes setting a plurality of threshold values, applying bias current or voltage to a read element of the magnetic head, applying an external transverse magnetic field to the magnetic head, amplifying output signal from ... | 01/26/2012 |
| 20120008232 | CONTROLLING POSITIONS OF STORAGE MEDIA HEADS Controlling positions of storage media heads is disclosed. An example storage media head position controller includes a position error filter to filter a media head position error based on a target position for a storage media head relative to a storage medium and a pre... | 01/12/2012 |
| 20120008233 | Extended Cavity VCSEL Mounted to Substrate with Electrical and Thermal Contact to Substrate and Optical Power Directed Toward Substrate A system according to one embodiment includes a slider adapted for use in a hard disk drive; and a laser coupled to a slider, wherein electrical contacts of the laser are positioned towards or face the slider, wherein light from the laser is emitted towards the slider, ... | 01/12/2012 |
| 20110317307 | Motor and recording disc driving device There are provided a motor and a recording disc driving device, which may minimize a frictional force between a shaft and a bearing assembly to enable a rotor to be readily rotated at the time of initial movement of the rotor. The motor may include: a bearing assembly i... | 12/29/2011 |
| 20110317308 | MAGNETIC RECORDING APPARATUS According to one embodiment, a magnetic recording apparatus includes a magnetic recording medium for perpendicular magnetic recording system, a magnetic head including a read head to read data from the magnetic recording medium, and an actuator to actuate the magnetic h... | 12/29/2011 |
| 20110310505 | MAGNETIC STORAGE DEVICE CAPABLE OF RECORDING DROP HEIGHT AND ELECTRONIC DEVICE USING THE SAME A magnetic storage device capable of recording a drop height and an electronic device using the same are presented. The magnetic storage device includes: a G-sensor, installed in the magnetic storage device, for outputting a first trigger signal when the magnetic storag... | 12/22/2011 |
| 20110299190 | DETECTING TOUCH DOWN AND/OR ASSESSING QUALITY IN A HARD DISK DRIVE This application discloses a hard disk drive and a control circuit that are configured to determine touchdown by determining the SAGC for a track, removing the repeatable component of the SAGC to create the non-repeatable component and determining an indication of clear... | 12/08/2011 |
| 20110299189 | ACTIVE HEAD SLIDER HAVING PIEZOELECTRIC AND THERMAL ACTUATORS An active head slider for a use in a Hard Disk drive having first and second actuators. The first actuator deforming a portion of a slider body that includes a read/write head to reduce the flying height of the portion over a disk. The second actuator forming a protrusi... | 12/08/2011 |
| 20110299191 | Electrical current as probe for modulation at head-disk interface A system and method for measuring the modulation between a magnetic head and a magnetic storage medium, such as a disk, is disclosed. A magnetic read/write head is positioned above a magnetic storage medium at a given flying height. The magnetic read/write head reads a ... | 12/08/2011 |
| 20110299192 | MAGNETIC RECORDING HEAD AND MAGNETIC RECORDING APPARATUS An example magnetic recording head includes: a main magnetic pole; a laminated body; and a pair of electrodes. The laminated body includes a first magnetic layer having a coercivity lower than magnetic field applied by the main magnetic pole, a second magnetic layer hav... | 12/08/2011 |
| 20110292540 | Systems and Methods for Protecting Hard Disk Drives A modified hard disk drive (HDD) state is provided. The modified HDD state corresponds to a state wherein the heads of a hard disk drive assembly are parked as a baseline setting, but permitted to float over the platters for completing requests on a limited basis. This ... | 12/01/2011 |
| 20110292534 | DISK DRIVE EMPLOYING A PREAMP COMPRISING READ/WRITE PASS THROUGHS FOR CASCADING INTEGRATED CIRCUITS A disk drive is disclosed comprising a plurality of disk surfaces and a plurality of corresponding heads. The disk drive further comprises a preamp including a first integrated circuit coupled to a first plurality of the heads. The first integrated circuit comprises a f... | 12/01/2011 |
| 20110286130 | ENERGY-SAVING OPERATION OF A STORAGE DEVICE A computer implemented method is disclosed, for energy-saving operation of a storage device with a read/write head. The method includes monitoring workload of the storage device, calculating current mean workload and adjusting seek speed of the read/write head of the st... | 11/24/2011 |
| 20110279923 | MAGNETORESISTIVE ELEMENT HAVING A PAIR OF SIDE SHIELDS An MR element includes an MR stack disposed between first and second main shield portions, and a pair of side shields disposed on opposite sides of the MR stack in the track width direction. The first main shield portion includes a first exchange coupling shield layer t... | 11/17/2011 |
| 20110279924 | Patterned media for self-servowriting integrated servo fields Pre-patterned discrete track media for self-servo writing are described. Embodiments include land and groove patterns for two or more Integrated Servo sequence fields for each servo sector in which one of the Integrated Servo sequence fields is aligned with the data tra... | 11/17/2011 |
| 20110261482 | INFORMATION PROCESSING APPARATUS AND HEAD EVACUATION PROCESSING METHOD THEREFOR An information processing apparatus includes a hard disk drive, an acceleration detection portion, and a controller. The hard disk drive has a protective function for moving a head from a recording area of a disk to an evacuation position. The acceleration detection por... | 10/27/2011 |
| 20110255189 | METHOD OF DETECTING TOUCHDOWN OF MAGNETIC HEAD USING TIMESTAMPS, AND MAGNETIC DISK DRIVE TO WHICH THE METHOD IS APPLIED According to one embodiment, a method of detecting contact of a magnetic head with a magnetic disk by changing the dynamic flying height of the magnetic head in a magnetic disk drive is disclosed. The method can detect a change in the rotational speed of the magnetic di... | 10/20/2011 |
| 20110249361 | FLY-HEIGHT CONTROL USING ASYNCHRONOUS SAMPLING In one embodiment, a hard-disk drive system performs fly-height control using a read-back mode and a loop-back mode. The read-back mode measures first and second harmonics pre-recorded on the medium and divides the first measurement by the second to obtain a read-back m... | 10/13/2011 |
| 20110249359 | MAGNETIC HEAD HAVING AN ASYMMETRICAL SHAPE AND SYSTEMS THEREOF A magnetic head, according to one embodiment, includes a main magnetic pole having a protruding portion such that a distance from a first side of a trailing edge of the main magnetic pole to a leading edge of the main magnetic pole is different from a distance from a se... | 10/13/2011 |
| 20110249360 | PERPENDICULAR MAGNETIC RECORDING HEAD According to one embodiment, a perpendicular magnetic recording head includes a main magnetic pole including a write magnetic pole layer for recording, the write magnetic pole layer comprising magnetic layers being antiferromagnetically coupled via a thin non-magnetic c... | 10/13/2011 |
| 20110249357 | METHOD OF PROTECTING INFORMATION WRITTEN TO RECORDING MEDIUM, AND DISK DRIVE AND RECORDING MEDIUM EMPLOYING THE METHOD A method of protecting information written to a recording medium includes magnetizing the recording medium to form a first magnetic pattern corresponding to information to be stored, and magnetizing the recording medium to form a protective magnetic pattern having a pha... | 10/13/2011 |
| 20110242698 | Barium Ferrite Magnetic Storage Media Magnetic storage media that include a multilayer structure are described. In general, the magnetic storage media include a substrate, an underlayer that includes a plurality of underlayer particles formed over the substrate, and a magnetic layer that includes a pluralit... | 10/06/2011 |
| 20110242699 | HARD DISK CONTROL MODULE, APPARATUSES HAVING THE SAME, AND METHOD OF CONTROLLING UNLOAD STANDBY TIME THEREOF A hard disk control module includes a load/unload counter and a controller. The load/unload counter counts a number of loads/unloads of a head on/from a surface of a disk. The controller may determine the number of counted loads/unloads during a reference time. The cont... | 10/06/2011 |
