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| Number | Title | Issue Date |
| 8184389 | Sensor resonant frequency identification and filter tuning Methods of tuning a notch filter to remove resonant frequency components from an output signal of a vibration sensor. Some methods according to the invention include exciting the vibration sensor with an excitation signal including energy in a frequency band that ma... | 05/22/2012 |
| 8144413 | Reduced instruction set computer (RISC) processor based disk manager architecture for hard disk drive (HDD) controllers Reduced instruction set computer (RISC) processor based disk manager architecture for HDD (Hard Disk Drive) controllers. Disk manager operations of a HDD are off-loaded from a main processor to a dedicated RISC processor. The main processor is operable to provide hi... | 03/27/2012 |
| 8139301 | Disk drive comprising a dual read element and delay circuitry to improve read signal A disk drive is disclosed comprising a disk having a plurality of data tracks, and a head actuated over the disk, the head comprising a first read element and a second read element. A data track is read to generate a first read signal emanating from the first read e... | 03/20/2012 |
| 8139302 | Detecting a periodic sequence of servo signals A system and method are disclosed for detecting a periodic sequence. A value detector module detects a plurality of values of a periodic sequence. In one embodiment, a transformation module transforms the plurality of values into transformed values. A confinement mo... | 03/20/2012 |
| 8107177 | Electrical interconnect system with integrated transmission- line compensation components Impedance compensation features are used along the transmission-line path between a transmitter/driver/source and the receiver/transducer to compensate for the impedance discontinuities or mismatches (for example, those caused by physical interconnection features) a... | 01/31/2012 |
| 8094397 | System, method, and computer program product for characterizing media associated with data storage channels A system in one embodiment includes multiple analog inputs for receiving readback signals, an analog to digital converter coupled to each of the analog inputs for converting the readback signals to digital signals, a buffer coupled to outputs of the analog to digita... | 01/10/2012 |
| 8085486 | Method for interfacing non-volatile medium control system components In a method for causing data to be written to a non-volatile medium, first data to be encoded and written in a sector of the non-volatile medium as a codeword is transmitted to a write or read/write channel device, and a write gate signal corresponding to the sector... | 12/27/2011 |
| 8081395 | Continuous digital offset cancellation A disk drive is disclosed comprising a disk, a head for writing data to the disk, and control circuitry coupled to the head, the control circuitry comprising a signal amplifier outputting a first signal comprising an offset voltage, the control circuitry operable to... | 12/20/2011 |
| 8068299 | Disk drive device and data rewrite method thereof Embodiments of the present invention help to reduce the occurrence of read hard errors in a hard disk drive (HDD). According to one embodiment, a HDD rewrites data on all data tracks of a block M when the number of write operations to the block consisting of continu... | 11/29/2011 |
| 8059349 | Methods and systems for estimating time corresponding to peak signal amplitude Various systems and methods for peak signal detection. As one example, a method for peak signal detection that includes receiving a signal is disclosed. The received signal includes a signal region where the signal is increasing in amplitude, another signal region w... | 11/15/2011 |
| 8027112 | Low frequency booster for RV/shock/friction disturbance rejection A system for removing low frequency disturbance signals from a control system output. The system includes a controller, a mixer, a feedback loop, and a low pass filter. The controller generates a control signal. The mixer is connected to the controller and receives ... | 09/27/2011 |
| 8027111 | Word synchronization for servo read signals in tape drives Methods and apparatus for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read in magnetic tape drives. A soft output detector processes the PPM-encoded servo pattern read signal to produce a series of soft output sa... | 09/27/2011 |
| 8018671 | Mapping defects on a data wedge basis A method to map defects is provided. A select data track of a storage medium is scanned for a defect. At least one data wedge affected by the defect on the select data track is identified. Each data wedge includes available area for writing user data defined between... | 09/13/2011 |
| 8000047 | Inspection apparatus and inspection method of magnetic disk or magnetic head The present invention provides a technique for converting burst data to digital data, applying FFT operation to 2n (n is an integer) pieces of digital data in response to any start signal synchronized with a sector signal, applying a window function cente... | 08/16/2011 |
| 7982990 | Digital techniques to decode signals extracted from computer-readable storage media Methods, apparatuses, and systems describing digital techniques to decode signals extracted from computer-readable storage media. A digital signal that includes a digital representation of a repeatable runout signal having a magnitude and included in an analog signa... | 07/19/2011 |
| 7974030 | Systems and methods for dibit correction Various embodiments of the present invention provide systems and methods for providing a corrected dibit signal. As an example, various embodiments of the present invention provide dibit correction circuits. Such dibit correction circuits include a dibit sample buff... | 07/05/2011 |
| 7965461 | Information reproducing apparatus An information reproducing apparatus which reproduces information recorded on a medium includes an asymmetry correction circuit configured to correct an asymmetry of a signal read from a medium. The apparatus also includes a first high pass filter installed before t... | 06/21/2011 |
| 7961415 | Master calibration channel for a multichannel tape drive In one embodiment, an apparatus comprises two or more slave channels, wherein each one of the slave channels comprises a non-adaptive filter operable to filter an input signal to the slave channel using filter coefficients received from a master channel; and the mas... | 06/14/2011 |
| 7948699 | Systems and methods for equalizer optimization in a storage access retry Various embodiments of the present invention provide data processing circuits that include a multiplexer, a memory buffer, a data processing circuit, and a channel setting modification circuit. A first input of the multiplexer receives an input data set and a second... | 05/24/2011 |
| 7924520 | Method and apparatus for determining position of a storage medium A system and method for determining the value of a longitudinal position (“LPOS”) bit of a storage medium. A system comprises a selector that selects a value for a longitudinal position (“LPOS”) bit from a plurality of possible values derived from LPOS infor... | 04/12/2011 |
| 7885025 | Generating PES using readback signal distortion A data storage system includes a storage medium having a plurality of data sectors and a head that communicates with the data storage medium. The head produces a readback signal when reading information from the data storage medium. A computation unit extracts a dis... | 02/08/2011 |
| 7872823 | AGC loop with weighted zero forcing and LMS error sources and methods for using such Various embodiments of the present invention provide systems and methods for gain control. For example, some embodiments of the present invention provide variable gain control circuits. Such circuits include a zero forcing loop generating a zero forcing feedback and... | 01/18/2011 |
| 7869152 | Techniques for identifying servo sectors in storage devices Techniques are provided for identifying the servo sectors in a track on a data storage device. A data storage device identifies the servo sectors in a track by reading distributed index bits from multiple servo sectors in a track. The data storage device analyzes on... | 01/11/2011 |
| 7864466 | Signal processing apparatus and a signal storage system In general, circuit scale in a DAE is large. The proposed DAE includes First multipliers, Unit processing circuits and Combined circuits. First multipliers use temporary estimated values to respectively compute signals. Unit processing circuits use the signals, whic... | 01/04/2011 |
| 7859779 | Magnetic disk apparatus and magnetic disk access controlling method A magnetic disk apparatus includes a magnetic disk, a magnetic head, a servo reproduction signal generator and a magnetic head controller. The disk includes a data recording area and a servo-pattern area. The data recording area includes a non-magnetic area scattere... | 12/28/2010 |
| 7821729 | Storage apparatus and method for processing recording compensation According to an aspect of an embodiment, a storage apparatus has a storage for storing a plurality of compensation values in association with a plurality of bit sequence patterns, a head for writing data into a medium and a controller for controlling the apparatus a... | 10/26/2010 |
| 7813066 | Magnetic recording and reproduction method, recording apparatus, reproduction apparatus and magnetic recording medium A magnetic recording and reproduction method includes the steps of recording a plurality of tracks which make a unit for a signal process for data detection by means of a recording head on a magnetic recording medium, and reproducing signals of the plural tracks by ... | 10/12/2010 |
| 7787202 | Guided target search for hard disk drive applications A technique to perform a guided partial response target search for characterizing a read channel of a disk drive. A target adaptation scheme pre-selects a plurality of targets from a pool of potential targets based on certain criteria and the selected targets are so... | 08/31/2010 |
| 7787203 | Error correction mapping A method according to one embodiment includes receiving signals from multiple readers; and performing more error control processing on a signal from an outer reader than on a signal from an inner reader. A method according to one embodiment includes receiving signal... | 08/31/2010 |
| 7742251 | Timing insensitive method and apparatus for spectral analysis in a disk recording system A hard disk drive that includes a disk that contains at least one signal and a head that is coupled to the disk. The disk drive also contains a circuit that includes a data sampler that generates a plurality of data samples from the signal, a harmonic sensor coupled... | 06/22/2010 |
| 7738201 | Read error recovery using soft information In general, this disclosure describes read recovery techniques for data storage devices that use soft information associated with multiple read operations to detect data. Specifically, the read recovery techniques comprise computing soft information for each bit det... | 06/15/2010 |
| 7738200 | Systems and methods for estimating time corresponding to peak signal amplitude Various systems and methods for peak signal detection. As one example, a method for peak signal detection that includes receiving a signal is disclosed. The received signal includes a signal region where the signal is increasing in amplitude, another signal region w... | 06/15/2010 |
| 7733588 | Repetitive feed-forward algorithm for self-servo-write PLL A phase error reduction system includes a control module, a phase-locked loop (PLL) module, and a harmonic removal module. The control module generates source timestamps for a plurality of synchronization marks in a source signal using a clock and generates a plural... | 06/08/2010 |
| 7729071 | Readback apparatus and readback method A readback apparatus (a) calculates a variance value of a signal read by a head from a disc medium, (b) estimates a degree of offtracking of the head from a target track to an adjacent track, and interference power from the adjacent track using the variance value of... | 06/01/2010 |
| 7729070 | Method and apparatus for interpolating peak detection of servo stripe pulses A method and device for detecting a peak which is substantially the same as the actual peak are disclosed. In one embodiment, the device includes a filter, a shift register, a controller and a digital interpolator. The filter is configured to receive a plurality of ... | 06/01/2010 |
| 7710673 | Phase locking apparatus, phase locking method, data reproducing apparatus, data reproducing method, and programs A phase locking apparatus is disclosed which, includes a phase error information detecting device to detect phase error information indicating the phase error. The device has a phase position determining device to determine, based on run length limited information, ... | 05/04/2010 |
| 7697224 | Storing AD sampled data of read/write channel into ECC SRAM An embodiment in accordance with the present invention enables storing in a memory, multi-bit data corresponding to analog signals read from a medium before being converted to single-bit data as recorded data. In an embodiment of the present invention, an AD convert... | 04/13/2010 |
| 7660061 | Integrated circuit interface with locking signal An integrated circuit for recovering a position and clock period from an input bi-phase encoded digital signal, such as an SPDIF signal, has a longest interval detector arranged to count the intervals between phase changes of the input digital signal to derive the l... | 02/09/2010 |
| 7639443 | Magnetic disk controller and method Among other disclosed subject matter, a magnetic disk controller includes an interface that receives and transmits data to be written into a magnetic disk. The magnetic disk controller includes a first buffer and a second buffer each of which temporarily stores data... | 12/29/2009 |
| 7602567 | Feed-forward DC restoration in a perpendicular magnetic read channel A method of feed-forward DC restoration in a perpendicular magnetic read channel is disclosed. The method generally includes the steps of (A) generating a feed-forward signal by performing a first detection on an input signal, wherein a DC component of the input sig... | 10/13/2009 |
