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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...
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7623315 |
Circuits, systems, and methods for capacitive fly height measurement
Circuitry, systems, and methods for measuring the fly height of a read/write head in a magnetic data storage system. The circuitry generally includes a measurement circuit configured to determine...
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7623314 |
Head control device, storage device, and contact detection method
A head control device for controlling, through thermal expansion of a heater, a position of a head for reading and writing data from and to a storage medium, includes a heater control unit that...
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7620519 |
Burn-in process of producing data correlating elevation of disk drive head to temperature and method of controlling the elevation of the disk drive head using the data
Data characterizing a read/write head of a hard disk drive is produced in a burn-in process. The method includes measuring the flying height of the head at a first temperature in a burn-in chamber,...
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7619842 |
Method of determining optimal write current parameters of magnetic recording device and storage device using the method
Optimal write current of a data storage device is determined by writing test data with an initial write condition and evaluating a performance related to the pole tip protrusion (PTP) of a magnetic...
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7616394 |
Storage apparatus, control method and control apparatus
The heads have write head elements which record data onto a disk medium capable of coping with perpendicular magnetic recording and read head elements which reproduce data. The monitored band...
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7616298 |
Disk transfer mechanism, and disk inspection apparatus and disk inspection method using the same
The present invention is provided with a first and second spindle at respective initial positions spaced apart by a predetermined distance and disposed linearly at both sides of inspection...
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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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7609470 |
Information storage device, write current adjustment method for the information storage device, and write control circuit
There is provided a magnetic disk device or the like which is capable of improving signal quality by suppressing occurrence of erasure of adjacent tracks due to spreading of a writing spot. The...
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7602577 |
Rapid off track detection using in-drive microactuator
A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more...
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7602573 |
Device and method for adjusting distance between magnetic head and data storage medium
A device and method for adjusting a distance between a magnetic head and a data storage medium are provided. In the device, a microprocessor outputs a control signal for adjusting the distance to a...
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7599142 |
Apparatus and method for slider-disk contact indication by monitoring the spindle control signal in a hard disk drive
A hard disk drive including an electrical property meter sensing a spindle control signal to create an electrical property reading. Spindle control signal stimulates spindle motor to rotate at...
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7599139 |
Disk drive having a high performance access mode and a lower performance archive mode
A disk drive is disclosed including a disk having a plurality of tracks, and a head actuated over the disk. A write frequency of write data received from a host is monitored. When the write...
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7595958 |
System including a hard disk drive and stray magnetic field sensor and associated method
A system includes a host device and a disk drive interfaced with the host device are described as well as an associated method. The disk drive includes a magnetic media for storing information...
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7593176 |
Control apparatus and storage device
A control apparatus performs, when reading predetermined data stored in a storage medium, a correction of a signal read by a head during a Viterbi decoding process of the signal. A...
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7589924 |
Characteristic evaluation method for magnetic disk medium
To measure the nonlinear distortion of a magnetic disk even at a high recording density, a nonlinear transition shift and a partial erasure are separately measured. A periodic pattern containing...
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7586710 |
Control of transducer to tape spacing
A tape drive apparatus for reading and writing data on a magnetic tape includes at least one transducer that interacts with the magnetic tape. A temperature control element is positioned to...
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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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7580210 |
Method, apparatus, and medium for determining read and write frequencies in data storing systems and a disk drive using the same
A method of determining frequency bands of a data storage system and an apparatus using the same are provided. More particularly, a method of determining frequencies used for reading and writing...
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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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7570446 |
Disk drive with improved format efficiency and control method thereof
Embodiments of the invention provide a magnetic disk drive and its control method capable of effectively using the unrecordable area which is caused due to the composite magnetic head's gap between...
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7570445 |
Adaptively adjusting seek function control parameters based on off-track write events
A rate of occurrence of off-track write events is determined. A seek function control parameter for a head is adaptively adjusted based on the determined rate of occurrence of the off-track write...
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7567400 |
Method and apparatus for improving the error rate of track information on a magnetic storage device
An apparatus and method for improving the error rate of track information on a magnetic storage device is disclosed. One embodiment provides a counter for counting the number of writes to a first...
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7567398 |
Detection of fly height change in a disk drive
A method of detecting a change in fly-height comprising measuring a first baseline position error signal (PES) at a first diameter on a disk, measuring a second baseline PES at a second diameter,...
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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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7561358 |
Multi-register read channel optimization
A method for optimizing read/write channel parameters of a hard disk drive. The process includes measuring a first bit error rate of a head using an initial set of read/write channel parameters and...
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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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7555595 |
Methods and apparatus for writing servo frames to and/or verifying data areas of a storage medium
Methods and apparatus are disclosed for writing and verifying servo frames written on a storage medium, for verifying data areas of a storage medium, and for writing and verifying servo frames and...
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7549215 |
Method for manufacturing a magnetic head for perpendicular magnetic data recording
A structure and method for performing magnetic inductance testing of write heads formed on a wafer. The structure and method allows for the effective inductive testing of magnetic write heads at...
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7548390 |
HDD write control method and apparatus
A Hard Disk Drive (HDD) and related write control method are disclosed. The write control method includes; detecting a free fall state during a current write operation to a current sector, waiting...
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7545593 |
Magnetic storage systems and methods with tighter write fault window to improve reliability
A magnetic storage system includes a disk, a head, an actuator, and a servo controller. The servo controller monitors a value, such as a position error signal (PES) sample value, a predicted PES...
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7542230 |
Disk drive during self-servo writing
A disk drive self-servo writes on a storage disk. Servo bursts are self-written along a track using a transducer, a position error signal (PES) indicating repeatable runout due (RRO) for the servo...
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7538961 |
Using inductance to measure writer spacing in perpendicular magnetic recording
A magnetic data recording system that can directly measure soft underlayer spacing of a perpendicular magnetic write head during operation. The soft underlayer spacing of the magnetic write head...
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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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7529058 |
Track pitch examination method of storage apparatus, program, and storage apparatus
Track pitches of all the tracks of a disk medium provided in a storage apparatus are examined in a manufacturing examination step. First of all, a target position path which varies a target track...
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7529054 |
Adaptive recording band expansion methodology
A method, and system configured to implement the method, are provided. The method includes the steps of identifying a last usable track on a surface as a function of a parameter, and defining a...
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7529050 |
Track width measurement for magnetic recording heads
One embodiment in accordance with the invention is a method for measuring a track width for a magnetic recording head comprising writing a first track and a second track on a disk at two different...
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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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7525754 |
Repeated runout compensation using scaled position signals
In accordance with various embodiments, a radial separation distance between first and second servo seams on a storage medium is determined, and a scaled position signal is generated in relation to...
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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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7525745 |
Magnetic disk drive apparatus and method of controlling the same
According to one embodiment, a magnetic disk drive apparatus includes a nonvolatile memory which serves as a cache memory when data is recorded in a magnetic disk which records data, a threshold...
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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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7522360 |
Flying height measurement apparatus and method therefor
Provided is a new apparatus for measuring a flying height of a head requiring none of a specific magnetization pattern, that is, ahead flying height measurement apparatus for use within a disk...
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7522359 |
Write mode servo scan diagnostic for magnetic tape data storage cartridge
A diagnostic for magnetic tape data storage drives and magnetic tape data storage cartridges comprises a magnetic tape data storage drive having more stringent servo error detection in write mode...
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7518820 |
Detecting fly height of a head over a storage medium
A fly height control system comprises a measurement circuit that receives M pulses that are based on a predetermined pattern stored on a storage medium and that determines a first amplitude and a...
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7518819 |
Disk drive rewriting servo sectors by writing and servoing off of temporary servo data written in data sectors
A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises...
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7518814 |
Magnetic head tester and method of manufacturing magnetic disk drive
Embodiments of the invention provide an inexpensive magnetic head tester employing component parts of a production HDD and capable of exercising functions very close to those of a production HDD....
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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...
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7515372 |
Compensating the effects of static head-media spacing variations and nonlinear transition shift in heat assisted magnetic recording
An apparatus comprises a storage medium, a recording head, a source of electromagnetic radiation, and a control circuit for modulating the source of electromagnetic radiation in response to a...
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