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| Number | Title | Issue Date |
| 8154816 | Magneto resistive voltage biasing scheme with fast recovery and maximum dynamic range A system and method for providing a fast recovery for voltage bias applied to an MR sensor, when a voltage is applied to the MR sensor very quickly while the MR sensor transitions from an idle or sleep state to an active state includes an apparatus and method for ad... | 04/10/2012 |
| 8107181 | Apparatus, system, and method for measuring magnetoresistive head resistance An apparatus, system, and method are disclosed for measuring magnetoresistive head assembly resistance. A measurement module measures a reference voltage across a reference resistance while applying a reference current to the reference resistance. In addition, the m... | 01/31/2012 |
| 8094401 | Writing high frequency pattern over a DC background to detect skip track erasure for a disk drive A method of detecting skip track erasure for a head and disk of a disk drive is disclosed. N tracks are DC erased, and a periodic pattern is written to the disk at a target track within the DC erased tracks. The periodic pattern is substantially comprised of a high ... | 01/10/2012 |
| 8068305 | Secure data disposal for disk drive When a disk sector is written to, a bit for the sector is set indicating that the sector will require secure data disposal (SDD) to be run on it. To save time during end of life disposal, SDD is executed only on sectors whose bits indicate that they have been writte... | 11/29/2011 |
| 8049984 | Integrated slider bias control In a method of biasing a slider, a bias voltage is generated for biasing a slider. The bias voltage is integratedly coupled to a conductive body of the slider via an existing signal path of the slider such that the slider is biased with the bias voltage. The existin... | 11/01/2011 |
| 7961418 | Resistivity sense bias circuits and methods of operating the same Resistivity sense bias circuits are described herein. An example resistivity sense bias circuit for use with a magnetoresistive read head includes a current biasing portion configured to provide a bias current across the magnetoresistive read head thereby establishi... | 06/14/2011 |
| 7944640 | Bulk eraser including at least three magnets configured for erasing recorded information A bulk eraser for erasing recorded information on a magnetic-recording disk. The bulk eraser includes at least three magnets and a structure magnetically coupled with the at least three magnets to produce magnetic-flux density in a gap. The gap has a first portion, ... | 05/17/2011 |
| 7929240 | Systems and methods for adaptive MRA compensation Various embodiments of the present invention provide systems and methods for reducing head distortion. For example, various embodiments of the present invention provide storage devices that include a storage medium, a read/write head assembly, and an adaptive distor... | 04/19/2011 |
| 7898761 | Magneto resistive biasing scheme with fast recovery and maximum dynamic range A system and method for providing a fast recovery for voltage bias applied to an MR sensor, when a voltage is applied to the MR sensor very quickly while the MR sensor transitions from an idle or sleep state to an active state includes an apparatus and method for ad... | 03/01/2011 |
| 7894153 | Secure data disposal for disk drive When a disk sector is written to, a bit for the sector is set indicating that the sector will require secure data disposal (SDD) to be run on it. To save time during end of life disposal, SDD is executed only on sectors whose bits indicate that they have been writte... | 02/22/2011 |
| 7885032 | Apparatus and method for bulk erasure of disk drives The present invention is directed to a method and apparatus for bulk erasure of disk drives. According to the novel invention, one or more relatively small-sized permanent magnets or electromagnets are configured to be brought into close proximity to a particular di... | 02/08/2011 |
| 7880999 | Magnetic storage system with read during write A magnetic storage system includes a magnetic storage medium and a transducer positioned adjacent the magnetic storage medium. The transducer has a reader positioned adjacent writer and a reader bias coil located on the transducer. Transducer circuitry is configured... | 02/01/2011 |
| 7876519 | Self-spinning disk bulk erasure for hard disk assembly A method for erasing a disk of a hard disk drive. The method includes moving the hard disk drive adjacent to an erasure head that emanates a magnetic field. The magnetic field and moving hard disk drive cause a disk of the hard disk drive to spin under a Lorentz for... | 01/25/2011 |
| 7872824 | Setting an operating bias current for a magnetoresistive head by computing a target operating voltage A disk drive is disclosed having a disk, and a head actuated over the disk, the head comprising a magnetoresistive (MR) element. Control circuitry within the disk drive sets an operating bias current for the MR element by computing a target voltage for the MR elemen... | 01/18/2011 |
| 7852590 | Solid state memory decommissioner The present invention relates to an apparatus and method for easily, quickly and permanently decommissioning an electronic data storage device by thoroughly exposing the device to a strong field of microwave energy thereby eliminating any possibility of retrieving d... | 12/14/2010 |
| 7848043 | Circuits, systems, and methods for low noise biasing of magnetic-resistance sensors Circuits, systems, and methods for generating bias for a magneto-resistive (MR) sensor in a magnetic storage device. The circuits generally include an amplifier having an input coupled to a magneto-resistive (MR) sensor, a feedback resistive element having an output... | 12/07/2010 |
| 7839593 | Magneto-resistive biasing methods and systems A biasing device for a magneto-resistive element, including a first bias supply circuit coupled to the magneto-resistive element; and a first bias control circuit coupled to the first bias supply circuit, the first bias control circuit capable of controlling the fir... | 11/23/2010 |
| 7839592 | Magnetic head driving circuit with protection function A magnetic recording and reproducing device is a hard disk device which writes information onto a magnetic disk (not shown), or reads information therefrom, and includes: a reproducing head; a recording head; and a magnetic head driving circuit. The magnetic head dr... | 11/23/2010 |
| 7804658 | Biasing RMR with constant power An RMR is biased with constant power. Voltages are applied across at least two variable resistors, which are coupled on opposing ends of the RMR, to establish a current to the RMR, wherein the current is based on the voltages and on resistance values of the at least... | 09/28/2010 |
| 7804657 | Setting an operating bias current for a magnetoresistive head using ratio of target voltage and measured voltage A method is disclosed for setting an operating bias current for a magnetoresistive (MR) element. A bias current is applied to the MR element, and a voltage across the MR element is measured corresponding to the bias current. The bias current is then adjusted in resp... | 09/28/2010 |
| 7800854 | Calibration circuit for voltage mode biasing of magnetoresistive heads A system for calibrating a magneto-resistive (MR) head includes a biasing circuit and a calibration module. The biasing circuit generates a first current to bias a first head during a calibration mode and a calibrated current to bias the MR head during an operating ... | 09/21/2010 |
| 7768733 | Method for erasing data from magnetic tape storage media Disclosed is a method, for erasing data from a magnetic tape storage medium (92) housed in a cartridge (86) containing a memory in which are stored the last written track position (yy) of the last written, most recent information and the last track pos... | 08/03/2010 |
| 7760458 | Disk drive adjusting head bias during servo synchronization to compensate for over/under sensitivity A disk drive is disclosed comprising a disk including a plurality of servo sectors, a head actuated over the disk, the head for generating a read signal, and a gain control circuit for adjusting a gain of the read signal in response to a gain setting. A bias setting... | 07/20/2010 |
| 7751139 | Circuits, systems, and methods for calibration of bias across a magneto-resistive sensor Circuits, systems, and methods for generating and calibrating bias for a magneto-resistive (MR) sensor. The circuit relates to a preamplifier circuit in a magnetic storage system, including an amplifier having an input coupled to a first MR sensor node, a first feed... | 07/06/2010 |
| 7742252 | Apparatus, system, and method for controlling recording head substrate bias voltage An apparatus, system, and method are disclosed for dynamically controlling a recording head substrate bias voltage. The apparatus includes a midpoint module and a substrate module. The midpoint module calculates a midpoint voltage of a plurality of data read element... | 06/22/2010 |
| 7729076 | Angularly spaced spiral erase for media Embodiments of the present invention allow for media erasure. Various embodiments allow for controlling an actuator based on feedback signal measurements and disk phase to seek a head across a surface of a disk systematically for an erasure operation. Also, in vario... | 06/01/2010 |
| 7715141 | Shield biasing for MR devices A magnetic data storage system according to one embodiment includes a head having a reader, the reader further comprising a shield, a sensor, and leads coupled to the sensor; a charge clamp circuit electrically coupling the shield to the leads; and a bias circuit fo... | 05/11/2010 |
| 7701656 | Method and apparatus for permanent magnet erasure of magnetic storage media A permanent magnet degausser includes at least one magnetic field generator comprising magnetic elements arranged near a media conveyance path and a conveyor for transporting magnetic media through a magnetic media conveyance path. A passive belt or protector plate ... | 04/20/2010 |
| 7667914 | Direct coupled wide-bandwidth front-end with smart bias control amplifier Embodiments of the present invention provide a mixed-mode amplifier for amplifying signals in data storage devices such as disk drives. In one embodiments, a circuit for amplifying data signals comprises a magnetoresistive sensor having a bias voltage applied theret... | 02/23/2010 |
| 7667915 | Disk drive having a head amplifier for perpendicular magnetic recording According to one embodiment, a disk drive is provided which has a head amplifier having a function of, at a data recording time, outputting AC pattern data to a write head prior to the recording of the write data to allow it to be recorded on a write splice section ... | 02/23/2010 |
| 7656601 | Current biasing circuit to reduce MR common mode voltage jumping for MR resistance measurement A circuit for measuring resistance of a magnetoresistive head. First and second current biasing circuits are respectively coupled to opposite sides of the head. The first biasing circuit includes a first resistance, and the second biasing circuit includes a second r... | 02/02/2010 |
| 7656602 | Systems and methods for protecting a sensitive device from corrosion A method for protecting a magnetic head according to one embodiment includes reducing a relative humidity in a vicinity of a magnetic head by passing an elevated bias current through a sensor of the head during at least some time periods when the sensor is not in us... | 02/02/2010 |
| 7652837 | Data erasure apparatus and data erasure method Embodiments of the invention relate to erasing data recorded on a magnetic disk with increased certainty by using an external magnetic field. One embodiment is directed to a method for erasing data recorded on a magnetic disk, which is housed in a magnetic disk driv... | 01/26/2010 |
| 7630159 | Resistance mode comparator for determining head resistance An apparatus and method for determining a resistance of a magneto-resistive head. A current drawn by the head, in response to a fixed bias voltage across the head, is converted to a zero temperature coefficient current such that when supplied to a resistor connected... | 12/08/2009 |
| 7532426 | Method for erase process on recording surface of disk and disk drive apparatus Embodiments in accordance with the present invention erase a desired area on a recording surface of disk or disk drive apparatus. According to an embodiment, a hard disk drive (HDD) performs erase on a recording surface by moving a head element unit at one-half a se... | 05/12/2009 |
| 7515371 | Channel postamble extension to de-gauss pole tips A technique for de-gaussing the pole tips and yoke of a write transducer in a perpendicular magnetic recording system is provided. An oscillator in the read channel is configured to produce an adjustable signal pattern output to the preamplifier when a write operati... | 04/07/2009 |
| 7468852 | Method of demagnetizing magnetic recording medium and apparatus for carrying out same Embodiments of the invention improve efficiency in alternating-current demagnetization of a magnetic recording medium. In specific embodiments, magnet fields in a direction slanting to an easy direction of magnetization of recording layer magnetization of a medium i... | 12/23/2008 |
| 7460324 | Head amplifier circuit with function for degaussing residual magnetism of recording head In a data-recording mode, a driver circuit supplies a recording head with a recording current corresponding to write data. In a degaussing mode, the driver circuit supplies the recording head with a degaussing current for eliminating the residual magnetism of the he... | 12/02/2008 |
| 7450328 | Method for recording bursts on a disk and related apparatus Embodiments of the invention provide a method for recording bursts on a disk and a related apparatus. In accordance with an embodiment of the invention, a method for recording bursts on a burst field of a servo sector of a disk comprises generating a first write cur... | 11/11/2008 |
| 7440213 | Apparatus and method for controlling remnant magnetization in a magnetic recording head The present invention provides a magnetic writer. The magnetic writer comprises a write circuit, a write pole, a first write coil for inducing a first magnetic field in the write pole by a first current provided by the write circuit, and a second write coil for indu... | 10/21/2008 |
