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| Number | Title | Issue Date |
| 8179624 | Method and apparatus for evaluating a magnetic recording medium A method of evaluating a magnetic recording medium using a magnetic head having a reproduction element is disclosed The method includes the steps of (a) recording a signal in a predetermined area of the magnetic recording medium; (b) determining a first value of a r... | 05/15/2012 |
| 8164845 | Method and apparatus for asymmetry correction in magnetic recording channels A circuit for compensating asymmetry in a waveform of an input signal using a piecewise approximation of a saturation curve, the circuit including a first circuit configured to output a first compensation for a first section of the saturation curve using a first fun... | 04/24/2012 |
| 8164846 | Hybrid defect detection for recording channels Methods, systems and computer program products for performing hybrid defect detection are disclosed. A hybrid defect detection mechanism may be used to detect various classes of defects (e.g., long and shallow defects, and short and deep defects) while reducing the ... | 04/24/2012 |
| 8149527 | Systems and methods for reducing attenuation of information derived from a defective medium Various embodiments of the present invention provide systems and methods for data regeneration. For example, a method for data regeneration is disclosed that includes receiving a data input derived from a medium, determining a media defect corresponding to the data ... | 04/03/2012 |
| 8144412 | Magnetic disk device having mechanism for detecting projections on recording medium A thin film magnetic head includes a medium projection detection mechanism that detects a projection on the surface of a recording medium. The medium projection detection mechanism has a discharging electrode, a capacitor, and an input line and an output line that a... | 03/27/2012 |
| 8098447 | Method and apparatus to limit DC-level in coded data In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written sequence is likely to have very poor DC characteristics. If that is th... | 01/17/2012 |
| 8077414 | System and method for analyzing magnetic media surfaces for thermal erasures and other characteristics Analyzing magnetic media surfaces for thermal erasures and other characteristics is described. The system includes a drive channel module configured to measure servo automatic gain control values for a magnetic media surface that represent the amount of gain applied... | 12/13/2011 |
| 7933084 | Corrective adjustment of recording characteristics in digital renditions of analog recordings A signal reconstruction technique is used to correct for wow and flutter in analog audio recordings. Elements of the recording are used to generate a signal for correcting the output. Involves locating modulated entities such as bias signal (e.g. frequency-modulated... | 04/26/2011 |
| 7924518 | Systems and methods for adaptive write pre-compensation Various embodiments of the present invention provide systems and methods for write pre-compensation. For example, various embodiments of the present invention provide methods for modifying magnetic information transfer. The methods include retrieving magnetically re... | 04/12/2011 |
| 7889446 | Baseline correction apparatus A read channel includes a variable gain amplifier, a low-pass filter, an AGC, an analog-to-digital converter, a frequency synthesizer, a filter, a soft-output detector, an LDPC decoding unit, a synchronizing signal detector, a run-length limited decoding unit, a des... | 02/15/2011 |
| 7880986 | Method and apparatus for write precompensation in a magnetic recording system A phase interpolator is provided that, in one implementation, includes an output node, a plurality of phase input circuits, and a plurality of switches corresponding to the plurality of phase input circuits. Each phase input circuit is operable to receive a given ph... | 02/01/2011 |
| 7872821 | Systems and methods for Nyquist tone harmonic measurements Various embodiments of the present invention provide systems and methods for determining changes in fly-height. For example, various embodiments of the present invention provide storage devices that include a storage medium, an offset frequency, a read/write head as... | 01/18/2011 |
| 7864464 | Disk clock system with up-sampler to generate frequency offset A system reads data from a magnetic storage media. A read head reads data from the magnetic storage media and produce an analog signal. A variable gain amplifier amplifies the analog signal. An offset adjust module substantially centers the amplified analog signal t... | 01/04/2011 |
| 7643233 | Disk clock system with up-sampler to generate frequency offset A system reads data from a magnetic storage media. A read head reads data from the magnetic storage media and produce an analog signal. A variable gain amplifier amplifies the analog signal. An offset adjust module substantially centers the amplified analog signal t... | 01/05/2010 |
| 7630154 | Hard disk inspection method and system A method an apparatus for testing the surface of hard disk platters having vertically oriented magnetic domains is disclosed. According to the method of the present invention, all of the magnetic domains on the surface of the disk to be tested are oriented in the sa... | 12/08/2009 |
| 7626777 | Variable threshold bipolar signal peak detector A method and apparatus for detecting signal peaks caused by a thermal asperity event in a magnetic recording media to reduce data reading errors introduced by the thermal asperity event. A common mode voltage is determined for differential signals representing data ... | 12/01/2009 |
| 7623309 | Apparatus and method for use in transferring information relative to a storage medium Plural information transfer elements transfer signals from plural magnetic tape tracks of plural tapes. Each element and track has a different non-linear transfer function. A processor (1) determines appropriate compensation for the signal one of the transfer elemen... | 11/24/2009 |
| 7595948 | Thermal asperity detection for perpendicular magnetic recording A perpendicular recording system includes a summing module that has a first input that receives a read signal. A DC correction module selectively generates a DC correction signal to reduce DC offset in the read signal. The DC correction signal is output to a second ... | 09/29/2009 |
| 7583456 | Method and apparatus to limit DC-level in coded data In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written sequence is likely to have very poor DC characteristics. If that is th... | 09/01/2009 |
| 7545592 | Flying height measurement method and system A flying height of a slider of a head assembly is measured by rotating a disk having at least one protrusion protruding higher than a minimum flying height of the head assembly subject to measurement, and cutting an upper end portion of the protrusion with the slide... | 06/09/2009 |
| 7518813 | Methods and structure for detecting anomalous events in a disk drive using VGA variance Methods and structures for detecting touchdown of the read/write head on its recording surface or for detecting other read signal amplitude modulations as proportional to variance of the value of the read channel variable gain amplifier (“VGA”). Variance in the ... | 04/14/2009 |
| 7483227 | Detecting a thermal asperity condition of a disk drive head responsive to data value transitions Methods are disclosed for detecting a thermal asperity condition of a head that is configured to generate a read signal by reading data on a rotatable data storage disk in a disk drive. The read signal includes a data component and a thermal component. The read sign... | 01/27/2009 |
| 7457064 | Perpendicular magnetic recording medium, method of evaluating magnetic properties of the same Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnet... | 11/25/2008 |
| 7436619 | Head floating amount control method and unit, storage apparatus and computer-readable program A head floating amount control unit control a head floating amount of each of a plurality of heads respectively having a heater, with respect to a recording medium, by detecting contact between each head and a corresponding recording medium by detecting a thermal as... | 10/14/2008 |
| 7428115 | Magnetic hard disk drive with countermeasure against spike noise Embodiments of the invention provide a countermeasure against spike noise maintaining the data reliability of a magnetic recording layer. In one embodiment, the magnetic domain state right below and around the read head of the soft magnetic layer in the recording me... | 09/23/2008 |
| 7411752 | Head vibration detection device and method A disc drive including a transducer supported on the head suspension assembly to induce a transducer signal in response to head vibration. The transducer signal is level detected to output a level detected signal indicative of head vibration. A method for detecting ... | 08/12/2008 |
| 7397621 | Servo pattern characterization on magnetic disks In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected from the surface, and a signal processing module. The signal process... | 07/08/2008 |
| 7373074 | Video recording apparatus A video recording apparatus includes a tuner for receiving television broadcast waves, an intermediate frequency circuit for demodulating intermediate frequency (IF) signals outputted from the tuner into video signals, a video recorder for recording the video signal... | 05/13/2008 |
| 7372652 | Correcting errors in disk drive read back signals by iterating with the Reed-Solomon decoder A read channel includes a signal receiver that receives a read back signal and a signal detector to detect symbols in the read back signal. The signal detector includes a first detector that generates raw decisions as a function of the read back signal, a post proce... | 05/13/2008 |
| 7372651 | Introducing a noise signal into a read-back signal when data is written to a removable data storage medium In one exemplary embodiment, a noise signal is introduced into a read-back signal when data is written to a removable data storage medium. While writing the data to the removable data storage medium, a portion of the data written to the removable data storage medium... | 05/13/2008 |
| 7359138 | Method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider In method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider, a slider is isolated from ground. A velocity signal is acquired from the slider. The velocity signal is filtered to acquire a vibration signal. The vibrati... | 04/15/2008 |
| 7359134 | Data save processing method for disk storage device and disk storage system A disk storage device has a plurality of disk faces and a plurality of heads. The disk storage device protects the data on the disk face for a head before the defect of the head occurs. For each head, a table for accumulating the error generation count generated by ... | 04/15/2008 |
| 7360147 | Second stage SOVA detector A second stage SOVA detector comprises a dynamic state reordering block with inputs that receive absolute state domain data from a first stage SOVA detector. The second stage SOVA detector provides relative state domain data outputs and selection bit outputs. The se... | 04/15/2008 |
| 7352530 | Method and apparatus for reducing a suspension gram load to increase head to disk interface reliability for contact recording systems An apparatus and method for reducing a suspension gram load to increase head to disk interface reliability for contact recording systems. The method provides a suspension for reaching over a disk. A slider having a read/write head element on a trailing edge (TE) por... | 04/01/2008 |
| 7352525 | Hard disk drive fly height adjust method and apparatus during error recovery Data recovery, following a read error in a hard disk drive, is provided which includes an adjustment of fly height. In one embodiment, some re-reads are performed by both adjusting the fly height and the off-track positioning of the read head. In one embodiment, two... | 04/01/2008 |
| 7349170 | Method of monitoring operation of a disk drive by analyzing the envelope of a read-back signal in the frequency domain A method monitors operation of a disk drive. The method includes providing a disk drive which includes a rotating disk and a head having a read transducer in proximity to a surface of the disk and an adjustment mechanism which controllably adjusts an average relativ... | 03/25/2008 |
| 7337385 | Decoding apparatus and method for decoding the data encoded with an LDPC code A channel condition detecting unit detects a condition of a channel between a transmitting apparatus and a receiving apparatus, in accordance with a pilot signal. A reference check matrix employed for LDPC coding in the transmitting apparatus is stored in the check ... | 02/26/2008 |
| 7334165 | Signal processing apparatus and a data recording and reproducing apparatus including local memory processor In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly pro... | 02/19/2008 |
| 7330320 | Method and apparatus to limit DC-level in coded data In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written sequence is likely to have very poor DC characteristics. If that is th... | 02/12/2008 |
| 7327103 | Driver and method for control of voice coil motor in disk drive A driver for a voice coil motor in a disk drive includes a sensor that provides a sense current by sensing a coil current in the voice coil motor, a comparator that provides an error current by determining a difference between a command current and the sense current... | 02/05/2008 |
