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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...
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8184390 |
Data pattern dependent amplitude adjustment
Data is processed by receiving data having a value. The amplitude of the received data is adjusted using the processor based at least in part on the value of the received data to obtain modified data.
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8149954 |
Baseline wander compensation for perpendicular recording
A tail estimate signal which includes noise associated with baseline wander is generated. The tail estimate signal is generated by processing an input signal using a detector to obtain one or more...
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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...
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8139305 |
Systems and methods for timing and gain acquisition
Various embodiments of the present invention provide systems and methods for acquiring timing and/or gain information. For example, various embodiments of the present invention provide data...
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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...
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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...
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8134798 |
Disk drive maintaining a substantially constant host transfer rate when reading data from varying data rate data tracks across multiple disk surfaces
A disk drive is disclosed having a plurality of disk surfaces, wherein each disk surface comprises a plurality of data tracks, and each data track comprises a plurality of data sectors. When a read...
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8120870 |
Asymmetry correction in read signal
Systems and techniques associated with signal processing are described. A described technique includes generating asymmetry vectors that model asymmetry in a received analog signal, including an...
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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...
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8102615 |
Data storage apparatus
A data storage apparatus includes: a medium for storing data having synchronization marks and data blocks, the synchronization mark and the data block being allocated alternately in the...
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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...
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8095712 |
Apparatus and method to read information from an information storage medium
A method and apparatus to read information from an information storage medium using a read channel, where that read channel includes a data cache. The invention generates an analog waveform...
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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...
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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...
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8077419 |
Method and apparatus for adjusting a gain of a variable gain amplifier in a read channel module
A read-channel module including a VGA module to amplify a signal based on a variable gain, an ADC module to generate a sample based on the amplified signal, and an AGC module to control the...
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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...
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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...
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8027114 |
Spiral servo detection with phase-locked loop (PLL)
The present disclosure includes apparatus, systems and techniques relating to detecting sync marks. In some implementations, an apparatus includes phase locking circuitry that includes a phase...
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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...
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8027423 |
Synchronizing apparatus, synchronizing method, synchronizing program and data reproduction apparatus
A synchronizing apparatus, which controls, by a PLL circuit, a sampling clock to be used to sample input data and synchronizes a phase of the sampling clock with a target phase that is desirable...
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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...
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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...
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8009541 |
Device, method, and computer program product for data migration
A device, method, and computer program product are provided for migrating pieces of data from a first recording location to a second recording location based on access frequency. The device...
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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...
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7990644 |
Apparatus and method to decode linear position information encoded in a sequential information storage medium
A method to decode linear position (“LPOS”) information encoded in a sequential information storage medium, by detecting each of one or a plurality of sequential first LPOS servo patterns enc...
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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...
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7982998 |
Communications channel with programmable coupling
A communications circuit includes a first filter having a corner frequency that is adjustable. A data type identifier that tracks first and second types of data flowing through the communications...
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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...
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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....
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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...
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7953911 |
Apparatus and method to read information from an information storage medium
A method and apparatus to read information from an information storage medium using a read channel, where that read channel includes a data cache. The invention generates an analog waveform...
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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...
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7944639 |
Disk drive adapting equalizer relative to bit error rate of sequence detector
A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of...
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7945009 |
Jitter measurement
A specialized structure measures clock-to-data jitter in an optical memory interface by averaging the result of two second-order estimates of zero crossing using measured signal values on either...
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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 (“L...
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7924522 |
Apparatus and method of detecting error symbol, and disk drive apparatus using the same
An apparatus and a method of detecting an error symbol in a data storage apparatus so that an error correcting performance of an error correction decoder. The error symbol detecting apparatus...
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7898757 |
Hard disk drive with divided data sectors and hard disk drive controller for controlling the same
A hard disk drive controller includes a buffer block temporarily storing recording data received from a host or reproduced data to be output to the host. A formatter outputs the recording data or...
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7898756 |
Disk drive adapting target values of a sequence detector relative to bit error rate of the sequence detector
A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of...
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7894149 |
Disc drive device
Embodiments of the present invention precisely measure clearance variation by temperature change using a value in a RW channel. In an embodiment of the present invention, an HDD measures resolution...
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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...
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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...
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7881164 |
Sync mark detection with polarity uncertainty
Systems and methods for detecting a disk sync mark are provided. The systems and methods for detecting the disk sync mark rely on a detecting the disk sync mark on at least one timing interval. A...
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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...
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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...
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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...
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7859780 |
Systems and methods for on-the-fly write pre-compensation estimation
Various embodiments of the present invention provide systems and methods for write pre-compensation. For example, various embodiments of the present invention provide systems for on-the-fly...
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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...
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7852589 |
Disk drive
Embodiments in accordance with the present invention provide a magnetic disk drive capable of achieving error recovery stably in a simple configuration in the event of thermal asperity (TA) and...
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7835466 |
Baseline wander compensation for perpendicular recording
Baseline wander is removed. A first decision signal is generated from an input signal using a first detector. Baseline wander associated with the input signal is estimated using the first decision...
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