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7623311 |
Recording media, recording and reproducing apparatus, and method for recording and reproducing
A magnetic recording layer is formed on a surface of a substrate in magnetic recording media to define magnetic recording regions. Magnetic missing portions are provided in the magnetic recording...
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7613975 |
Predictive diagnosis of a data read system
A data read system comprising a read channel for processing a signal, and a diagnostic controller in communication with the read channel. The diagnostic controller is configured to measure at least...
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7612960 |
Method for formatting data sectors on magnetic disk, and magnetic disk drive
Embodiments of the present invention efficiently format long sectors, without decreasing the performance, in a magnetic disk drive in which servo sectors are radially formed at regular intervals,...
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7605992 |
Robust LPOS detection with predictor and bit verifier
A tape drive system which includes the ability to reliably reproduce LPOS information even if both of the servo channels of the tape drive system could not detect the LPOS information due to...
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7599140 |
Output control device and recording-medium-driver control device
A determining unit determines whether a clock signal is oscillated with an oscillation amplitude equal to or greater than a predetermined value. An output control unit outputs the clock signal to...
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7589925 |
Method of accessing variable density data tracks in a disk drive
A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk...
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7586707 |
Magnetic disk drive with increased storage capacity
Embodiments of the invention provide a magnetic disk drive capable of reducing an area used for a preamble of each data sector to increase the storage capacity. The magnetic disk drive adopts a...
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7583461 |
Defect registration method of magnetic disk, and magnetic disk drive
Embodiments of the present invention provide a defect registration method for performing defect registration of sectors on a magnetic disk. In one embodiment, a rectangular detection window is...
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7583458 |
Channel optimization metrics
A recording system, such as a magnetic or optical recording system, employs optimization metrics that are independent of a target partial response for equalization of a signal read from a recording...
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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...
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7580214 |
Retry and re-read for write synchronization
A method of detecting a cycle slip in a data string read from a bit patterned media and adjusting the data string to compensate for the cycle slip is disclosed. A system including a writeable data...
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7573667 |
Servo information write method and apparatus
Embodiments of the invention provide a servo information write method that makes it possible to properly locate the last-written servo information even when old servo information is overwritten by...
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7573664 |
Integrated multiple channel data reliability testing for a magnetic tape drive
Data reliability testing for a magnetic tape drive is conducted separately for the channels of a magnetic tape drive which write and read tracks of a multiple track magnetic tape. Memory stores...
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7570447 |
Storage control device and method for detecting write errors to storage media
There are provided a cache region that stores write data from a host device, storage media, a data storage region for the storage media, and a comparison unit. A first comparison object is...
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7567397 |
Adjacent Track Interference (ATI) identification methodology
A method for identifying adjacent track interference for a head is provided. The method comprises writing a first data track at a predetermined track position; writing a second data track two track...
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7558839 |
Read-after-write verification for improved write-once-read-many data storage
A user interface in a file-based networked storage server enables a user to selectively enable or disable an option to require read-after-write verification for sets of data stored by the...
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7558012 |
Read/write channel embedded on-chip optimization
Embodiments of the present invention provide optimization of read/write channels in a recording system by embedding channel optimization algorithm/procedure into the channels, or a system-on-chip...
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7552097 |
Methods and apparatus for decoding LDPC codes
Methods and apparatus for decoding codewords using message passing decoding techniques which are particularly well suited for use with low density parity check (LDPC) codes and long codewords are...
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7545594 |
Method and system for removing signal defects in MR head signals
The disclosure describes a data storage system that includes a signal defect correction system for removing signal defects in magnetoresistive head playback signals. The signal defect correction...
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7539911 |
Test mode for programming rate and precharge time for DRAM activate-precharge cycle
A programmable activate-precharge cycle are provided for a DRAM device. Activate and precharge signals associated with the activate-precharge cycle are generated on the basis of the programmed rate...
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7538962 |
Media event timer and methods for use therewith
A media event timer includes a counter module for generating a sequence of counts based on a clock signal of a disk drive unit. A counter reset module sets the counter module to a reset count in...
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7532422 |
Method and system for distinguishing spatial and thermal defects on perpendicular media
Disclosed are a method and system for distinguishing spatial and thermal defects on perpendicular media. The magnetic domains of the perpendicular media are oriented to have a first polarity,...
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7529049 |
Method and system for testing of magnetic disks using F-BER
Spinstand test improvement that measures Functional Byte Error Rate (F-BER) of a disk. The F-BER is correlated to the BER of a disk. The F-BER test is faster than a BER test. The F-BER test is...
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7526713 |
Low power cost-effective ECC memory system and method
A memory controller couples 32-bit data words to and from a DRAM. The DRAM generates error checking and correcting syndromes to check and correct read data. The DRAM generates the syndromes from...
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7525752 |
Media drive and control method for the same
Embodiments in accordance with the present invention relate to improving error recovery process performance. A head slider in an embodiment of this invention includes a heater for adjusting a...
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7525748 |
Information recording/reproducing apparatus
A determining unit retrieves status information relating to recording or reproducing data on the magnetic disk, and determines whether to re-record data recorded in a recording area on the magnetic...
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7523380 |
Methods and structures for providing programmable width and error correction in memory arrays in programmable logic devices
A random access memory (RAM) in a programmable logic device (PLD) supports error correction as well as a configurable data width. The number of bits in a user data word varies by the selected...
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7522365 |
Magnetic storage systems and methods allowing for recovery of data blocks written off-track with non-constant offsets
A magnetic storage system includes a disk, a head, an actuator, a read channel, and a main controller. The main controller causes the head to read a data block of a selected track of the disk at...
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7522363 |
Medium storage device and medium rotation synchronization processing method for medium storage device
A medium storage device writes or read data on a storage medium synchronizing the rotation of the storage medium with the DSW method for decreasing the gap length considering the rotation jitter....
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7519894 |
Memory device with error correction code module
A memory device includes at least two DRAM memory modules, at least one external ECC module, and a memory controller. The external ECC module provides the memory modules with ECC functionality....
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7516389 |
Concatenated iterative and algebraic coding
An apparatus for error-correction encoding information includes, in one embodiment, an outer encode that generates algebraically decodable data, the outer encoder operatively coupled to one or more...
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7508611 |
Disk drive clock circuit that adjusts clock edge timing in response to servo information and methods thereof
A disk drive clock circuit includes a servo clock generator and a disk locked frequency converter. The servo clock generator generates a servo clock signal in response to servo information read...
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7505221 |
Multiple section read/write head
Data tracks are written across a width of a tape by positioning a first head section across the tape and writing a first subset of data tracks onto the tape with a first plurality of write elements...
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7502187 |
Address mark detection
A recording system, such as a magnetic or optical recording system, employs an address mark (AM) detector that searches for an address mark pattern that is augmented by one or more bits of a...
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7502186 |
Disk drive clock tracking circuit, error compensation circuit and method
A clock tracking circuit and method uses a clock compensation signal to compensate for timing marks on a media disk. The clock compensation signal may compensate for at least one of improper clock...
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7499820 |
Method for generating a performance metric for a tensilized tape
A method for generating an anti-shrink to delta creep amplitude performance metric for a tensilized tape. The method may include the steps of determining a zero point of the tensilized tape,...
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7496817 |
Method for determining integrity of memory
A method for testing the integrity of a memory with defective sections under a plurality of operating environments includes testing the memory with defective sections under a plurality of operating...
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7492545 |
Method and system for automatic time base adjustment for disk drive servo controllers
A system and method for a servo controller (SC) used in an embedded disk controller for adjusting stored servo skew values based on measured skew values is provided. The system includes, a servo...
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7492540 |
Apparatus system and method for variable data density patterned media
An apparatus, system, and method are disclosed for variable data density patterned media. The apparatus includes a patterned media recording surface comprising a plurality of sectors. Each sector...
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7489460 |
Magnetic data read circuit and card processing unit
A magnetic data read circuit includes a differentiation circuit and an integration circuit which are individually connected to a magnetic head, and a means of read judgment for pass/fail judgment...
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7486458 |
Magnetic disk drive with diagnosis of error-correcting retries
Embodiments of the invention relate to diagnosing error-correcting retries of an upper system by using a disk drive under control of the upper system. In one embodiment, a microprocessor can...
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7486457 |
Method and apparatus for predicting write failure resulting from flying height modulation
A method and apparatus for predicting write failure resulting from flying height modulation and initiating re-writing of data upon occurrence of the predicted write failure is disclosed. According...
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7484040 |
Highly available removable media storage network environment
A method for a removable media storage network environment that employs a media management system for managing a removable media system on behalf of client applications, and a media management...
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7477465 |
Method of protecting data on recording medium and recording medium storing program for executing the method
A method of protecting data on a recording medium against an adjacent track erase (ATE) effect, and a recording medium having a program therefor are provided. The method includes accumulating a...
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7474485 |
Magnetic disk medium, magnetic disk drive, and method for detecting rotational position of magnetic disk medium
Embodiments of the invention reduce the information (storage) overhead for determining the rotational position of a magnetic disk medium, as well as reducing the rotational position detection time....
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7463438 |
Information storage apparatus, and control method and program for the same
An information storage apparatus that records servo information and user data on a recording face of a recording medium wherein a track density measuring unit measures the optimal track density for...
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7460323 |
Methods and systems for automatically characterizing non-linearities of a read-back signal of a recording system
A method for automatically characterizing non-linearities of a perpendicular read-back signal of a recording system is disclosed. The method includes using dibit extraction to obtain a read-back...
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7443624 |
Method for recording data freshness degrees by a tape drive
A method for recording data freshness degrees by a tape drive is disclosed. During the recording of a set of data and a data freshness degree associated with the set of data a tape recording...
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7440212 |
Method and systems for a highly error tolerant tape format
Described herein are media drives for writing information to a media (e.g., a tape media), systems for storing information on a storage medium, and methods of writing information to a media. The...
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7440211 |
Apparatus and/or method of controlling timing of servo pulses and disk drive using the method
Provided is a method and apparatus for adaptively controlling the timing of servo pulses in a disk drive in consideration of the amount of spindle jitter generated when a disk rotation speed is...
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