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9042045 |
Disk drive adjusting a defect threshold when scanning for defective sectors
A disk drive is disclosed including a disk having a plurality of sectors, and a head actuated over the disk. A defect threshold is initialized, and a first sector is read to generate a first read... |
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9036284 |
Isolated shingled bands of fractional tracks
Systems and methods are disclosed for isolated bands of fractional tracks in data storage devices, particularly devices employing shingled magnetic recording. In one embodiment, a device may... |
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9030771 |
Compressed data verification
A media drive includes drive side circuitry that, in response to a request to validate compressed data read from media, validates packets of the compressed data while compressed and, in response... |
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9030772 |
Variable data density for data storage
Disclosed herein are methods and apparatuses that provide for variable data density on a disc data storage medium, where the variable data density may have a circumferential definition and a... |
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9025264 |
Methods for measuring media performance associated with adjacent track interference
Methods for measuring media performance associated with adjacent track interference are provided. One such method includes iteratively writing data to a target track for each of a plurality of n... |
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9025267 |
Data storage device using branch metric from adjacent track to compensate for inter-track interference
A data storage device is disclosed comprising a disk comprising a plurality of data tracks, and a head comprising a first read element and a second read element. A first data track is read using... |
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9019640 |
Read channel throughput management
An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data... |
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9019639 |
Hierarchical control of tiered error recovery for storage devices
A computer program product includes a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code being executable by a processing... |
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9013820 |
Method of reducing thermal stress within a magnetic head
Devices and methods for reducing thermal stress within a head of a storage device are disclosed. In one or more embodiments, a method includes writing a selected pattern to a storage medium of a... |
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9007709 |
Optimum tape layout selection for improved error correction capability
According to one embodiment, a system for selecting an optimum tape layout to store data on a tape medium may include a processor and logic integrated with and/or executable by the processor, the... |
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9007711 |
Sequential-access of storage media
The present disclosure describes apparatuses and techniques of improved sequential-access of storage media. In some aspects an indication that a storage media interface failed to access a block of... |
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9001445 |
Multiple sync mark storage system
A data processing system includes a number of analog to digital converters operable to sample analog signals obtained from a magnetic storage medium to yield digital signals, multiple sync mark... |
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8995074 |
Read channel optimization using evolutionary algorithms
The present disclosure includes systems and techniques relating to the use of evolutionary algorithms for tuning the performance of read channels. Instructions encoded on a medium are performed by... |
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8988799 |
Magnetic disk device and control method of magnetic disk
According to one embodiment, any of a first process to perform a write retry to a write target track, a second process to perform the write retry and perform reading for data verification to an... |
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8988807 |
Disk drive with different data sector integrated preambles in adjacent data tracks
A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track... |
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8988810 |
Track measurement for data storage device
Track placement on a disk of a Data Storage Device (DSD) including writing test data in a plurality of sectors in a test track on the disk. An adjacent track on the disk is written offset from the... |
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8976477 |
System and method for generating soft-orthogonal syncmarks
The disclosure is directed to a system and method of generating soft-orthogonal syncmarks for at least a first set of tracks and a second set of tracks. Random pairs of sync patterns are searched... |
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8976478 |
Band rewrites based on error scan counts
Systems and methods are disclosed for performing band rewrites on shingled storage media based on error scan counts. In one embodiment, a device may comprise a data storage medium including a... |
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8970976 |
Systems and methods for data dependent inter-track interference cancellation
Systems, methods, devices, circuits for data processing, and more particularly to systems and methods for reducing inter-track interference in relation to processing data retrieved from a storage... |
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8947815 |
Disk storage apparatus and data storage method
According to one embodiment, a disk storage apparatus includes a disk, a detector, and a controller. The disk includes a first recording area for recording with a first track density, and a second... |
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8947812 |
Data storage device comprising equalizer filter and inter-track interference filter
A data storage device is disclosed comprising a head actuated over a disk. A read signal from the head is sampled to generate signal samples, and the signal samples are filtered with an equalizer... |
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8941935 |
System and method for initiating refresh operations
A magnetic storage system includes a magnetic storage medium, a random-access memory (RAM), and a controller. The controller interfaces with both the magnetic storage medium and the RAM, and... |
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8937780 |
Error recovery procedure (ERP) using estimated best setting in first run
In one embodiment, an apparatus includes logic configured to count each data set read and/or write access that used error recovery procedure (ERP) and each data set read and/or write access that... |
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8934185 |
Storage device head instability recovery by heating from head heater
Technologies are described herein for recovering an instable head in a storage device using an internal head heater. An instability in the reader head may be detected, and, in response to... |
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8929014 |
Tape header protection scheme for use in a tape storage subsystem
In one embodiment, a system for integrating data and header protection in tape recording includes a processor and logic adapted to: provide a data array organized in rows and columns, each row of... |
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8929009 |
Irregular low density parity check decoder with low syndrome error handling
A data processing system is disclosed including a data decoder circuit, an error handling circuit and a syndrome checker circuit. The data decoder circuit is operable to apply a data decode... |
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8917469 |
Disk drive correcting an error in a detected gray code
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by a plurality of servo sectors. An estimated track ID is generated and a plurality of... |
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8917466 |
Systems and methods for governing in-flight data sets in a data processing system
The present inventions are related to systems and methods for data processing, and more particularly to systems and methods for governing a data processing system. |
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8917467 |
Systems and methods for ATI mitigation
Systems, methods, devices, circuits for data processing, and more particularly to data processing including adjacent track interference mitigation. |
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8908307 |
Systems and methods for hard disk drive region based data encoding
Systems and method relating generally to improving usage of storage area on a disk drive, and more particularly to systems and methods for applying encoding based upon the nature of a particular... |
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8902530 |
Decision directed and non-decision directed low frequency noise cancelation in turbo detection
A set of decisions is determined based at last in part on a set of samples. For a given sample in the set of samples, a low frequency noise estimate is estimated based at least in part on (1) at... |
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8902532 |
Write avoidance areas around bad blocks on a hard disk drive platter
A method and computer program product identify the location of a bad block on a disk platter of a hard disk drive, determine an avoidance area extending from the bad block, and prevent data from... |
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8902534 |
Implementing track following using data characteristics for positional information
A method, apparatus and a data storage device are provided for implementing track following and data recovery with readback of shingled data written in overlapping shingled data tracks on a... |
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8891191 |
Data storage device initializing read signal gain to detect servo seed pattern
A data storage device is disclosed comprising a disk comprising at least one servo seed pattern, and a head actuated over the disk. An amplitude measurement is generated based on a read signal... |
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8891195 |
Method and system for compensating for track squeeze
A storage device includes a storage medium having a plurality of tracks of data. Reading apparatus for reading a current track of data that has been subject to previous encroachment to an extent... |
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8884795 |
Reception device and reception method
A reception device and corresponding method for maintaining a high dynamic range of an AD converter circuit and preventing excessive input to the AD converter circuit is disclosed. For example, a... |
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8885277 |
Modulation coding for two-dimensional recording
Technologies are described herein for implementing modulation coding schemes for TDMR. A data sequence is received to be stored on a first data track of a recording media. The first data sequence... |
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8885283 |
Disk drive adjusting write block size based on detected vibration
A disk drive is disclosed comprising a head actuated over a disk having a plurality of data tracks. A vibration is detected, and a write operation is configured to write a first plurality of... |
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8879195 |
Logical block protection for tape interchange
A two part process is used for modifying records to be written and retrieved from tape devices. A record is appended with a cyclic redundancy check and a string of zeros. Submitting the entire... |
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8879186 |
Fast flaw scan for multiple sensor systems
A method for performing parallel flaw scans of a plurality of tracks of a storage device. The storage device includes at least one disk, at least two read sensors, at least two analog front ends,... |
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8873179 |
Bit-patterned media magnetic recording disk with two sizes of dots and imprint template made with directed self-assembly (DSA) of block copolymers
A bit-patterned media (BPM) magnetic recording disk has two sizes of dots of magnetic material. The large and small dots are formed together in a hexagonal-close-packed (HCP) pattern. In the data... |
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8873182 |
Multi-path data processing system
Various embodiments of the present invention provide apparatuses and methods for processing data in a multi-path data processing circuit. For example, an apparatus is disclosed that includes a... |
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8861107 |
Systems and methods for burst demodulation
A data processing circuit with flaw robust burst field demodulation includes a burst integration circuit operable to calculate burst integration results for a servo data burst field, a comparison... |
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8861111 |
Two dimensional magnetic recording servo system phase alignment
A servo system includes a first equalizer circuit operable to filter digital servo data samples derived from a first read head to yield first equalized data, a second equalizer circuit operable to... |
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8861112 |
Two dimensional magnetic recording system head separation estimator
An apparatus for estimating head separation in an array reader magnetic recording system includes an array reader with multiple read heads operable to read data from a magnetic storage medium, a... |
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8854759 |
Combined soft detection/soft decoding in tape drive storage channels
In one embodiment, a tape drive system includes a soft detector for executing a first forward loop of a detection algorithm on a first block of signal samples during a first time interval; and... |
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8854760 |
Systems and methods for preventing adjacent track erasure
A data processing circuit includes a subtraction circuit operable to subtract an ideal version of a data pattern from a sampled version of a data pattern to yield a difference signal, an error... |
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8854756 |
Systems and methods for mitigating data interference in a contact signal
The present inventions are related to systems and methods for determining contact between two elements, and more particularly to systems and methods for determining contact between a head assembly... |
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8854758 |
Track defect map for a disk drive data storage system
A method and apparatus for storing a disk drive media defect table or list. Defect table entries for a subject disk track are stored on the subject track and retrieved for determining defective... |
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8848304 |
Methods and apparatus for improved detection of servo sector data using single bit error correction
Methods and apparatus are provided for improved detection of servo sector data in a magnetic recording system using single bit error correction. Servo sector data is processed by detecting the... |