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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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7474488 |
Magnetic head, tape drive system, and method
A system such as a tape head having multiple read devices, where the read devices have less than or equal to half the width of the write devices or data tracks. The read devices are aligned...
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7466506 |
Magnetic recording disk drive with head positioning servo control system for disk surfaces with identical servo patterns
A magnetic recording disk drive has disks with identical pre-patterned servo patterns on their front and back surfaces and a servo control system for positioning the read/write heads using the...
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7436614 |
Data storage device and data storage device control
Embodiments of the invention provide a data storage device and its control method that are capable of minimizing the possibility of head deterioration while maintaining the minimum required...
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7379257 |
Magnetic disk drive
A magnetic disk drive includes an actuator arm, a suspension fixed to a tip end of the actuator arm, and a head slider having at least two electromagnetic transducers mounted at a tip end of the...
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7359134 |
Data save processing method for disk storage device and disk storage system
A disk storage device has a plurality of disk faces and a plurality of heads. The disk storage device protects the data on the disk face for a head before the defect of the head occurs. For each...
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7280298 |
Thin film magnetic head fit to recordation of higher frequency
A set of coils wind around a magnetic core in a thin film magnetic head. Current supplying circuits are separately connected to the individual coils. The individual coils get shorter in the overall...
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7271970 |
Composite magnetic head arranged so the reproducing elements do not overlap a pole of a recording element
A conventional magnetic head has a structure, in which a MR element and a recording element are stacked. The influence of a recording magnetic field on the magnetically sensitive portion of a...
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7245448 |
Information recording apparatus and data writing control device therefor
A plurality of recording media combined integrally having a plurality of recording surfaces; and a plurality sets of reading heads and writing heads, combined integrally, provided for the...
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7212368 |
Head switching method and system using track number matching
A method and system of switching heads in a hard disk drive written using an off-line STW method. In the method, first, deviations between a reference head and each of the heads are calculated....
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7190537 |
Self-raid system using hard disk drive having backup head and method of writing data to and reading data from hard disk drive having backup head
A self-Redundant Array of Inexpensive Disks (RAID) system using a hard disk drive having a backup head and a method of writing data to and reading data from the hard disk drive having the backup...
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7154688 |
Disk device having a function to confirm that a selected head is proper for a disk surface
In a disk device in which heads are positioned by a servo mechanism, the object of the present invention is to prevent data from being destroyed by incorrect selection of a head and to improve...
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7119974 |
Storing data to magnetic tape both to one set of tracks and in the same operation rewritten to another set of tracks
A recording system of a magnetic tape drive is operated to cause one separate set of write heads to write data discontinuously to magnetic tape as received, and to save the data, and, during the...
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7075747 |
Head position control method and disk device
A disk device that has displacement of servo signals in the circumference direction and radius direction between a plurality of disks, prevents a drop in performance due to the displacement when...
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7064913 |
Enhanced read margining using dither enhanced write marginalization for mass data storage applications
A recording target error rate is selected for one or more of data storage devices, and for each data storage device, a dither value is determined for each read/write head in the data storage...
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7023635 |
Recording/reproducing apparatus
A recording/reproducing apparatus capable of switching over among a plurality of heads with high precision, wherein the apparatus is provided with: a recording/reproducing unit for...
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6980386 |
Apparatus and method for writing data to an information storage disc
A disc drive has transducers supported by an actuator to fly proximate data tracks on surfaces of rotating information storage discs. Each of the discs is partitioned into concentric regions. A...
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6970311 |
Storing data to magnetic tape both to one set of tracks and in the same operation rewritten to another set of tracks
A recording system of a magnetic tape drive is operated to cause one separate set of write heads to write data discontinuously to magnetic tape as received, and to save the data, and, during the...
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6963462 |
Servo detection control system, servo detection control method and hard disk drive
For the purpose of providing technique by which even when large skew of a disk or a head occurs due to a thermal shock, an outside shock, or the like, a servo signal area is not extended, and a...
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6952320 |
Virtual tracks for repeatable runout compensation
The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks,...
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6934105 |
Tape reposition minimization using multiple reads
The present invention decreases the number of repositions during read back by making use of multiple read elements associated with each data track. A tape system includes a tape head with two read...
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6917485 |
Dynamic head switch timing recalibration apparatus and method
An apparatus and method for dynamic head switch timing recalibration are provided. With the apparatus and method, a determination is made as to whether a difference in a reference head switch...
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6903892 |
Minimization of tape repositions using multiple read elements per track
The present invention decreases the number of repositions during read back by making use of multiple read elements associated with each data track. Each of a plurality of sets of read electronics...
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6879454 |
Write-once read-many hard disk drive
A modified disk drive that includes means for selectively and permanently disabling the write mode of the hard disk drive by the use of programmable read only memory (PROM) circuitry is provided....
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6844995 |
Head protection device and a card reader having the head protection device
A head protection device in a data recording circuit is disclosed in which write-current of a given level that corresponds to a high or low level of coercive force of the magnetic recording portion...
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6819513 |
Low power hard disk drive using multiple, individually controllable actuators
A disk drive which incorporates separate actuators for each recording head so as to only place required recording heads over the recording media of multiple surface hard disk drives. The reduction...
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6781784 |
Reading tape with transverse distortion
Magnetic tape experiencing transverse distortion may be read by selecting between longitudinally offset read elements to read a data track. The read elements are part of a tape head having an...
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6765740 |
Composite magnetic head, magnetic disk drive using the head, and control method for the magnetic disk
A conventional magnetic head has a structure, in which a MR element and a recording element are stacked. The influence of a recording magnetic field on the magnetically sensitive portion of a...
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6757118 |
Apparatus and method for wiggle recovery in a disc drive having an embedded servo
A programmable controller and method for correcting operation of a read/write head in a disc drive having an embedded servo system in which the head is not reading correctly operates by applying a...
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6754032 |
Method and system for radial and circumferential alignment of data tracks on patterned media
Radial correction factors are calculated for each ruler on a patterned media in a data storage system. A ruler is a position-sensing pattern that defines the radial position of a recording head....
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6735030 |
Method to write servo on multi-channels with voltage mode data and single channel with current mode data
A write drive circuit ( 40 ) for a hard disk drive selectively providing a current mode operation for high speed data write of a single channel, and selectively providing a voltage mode operation...
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6728054 |
Drive with adaptive data format and head switch sequencing
A system for adapting head switching sequence in a disc drive includes a method of measuring the time duration for a head switch operation and the time duration of a track switch operation. The...
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6714373 |
Magnetic disk device having an improved seek control
A magnetic disk device has an improved seek control in which a waiting time occurred in a first magnetic head while it is scanning a first track, is utilized efficiently and effectively by...
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6687073 |
Method of simultaneously writing servo tracks on a hard disk drive
A method of writing servo tracks on the disk surfaces of a hard disk drive. The method involves simultaneously writing partial servo tracks, called servo wedges, until a complete first set of servo...
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6650496 |
Fully integrated matrix magnetic recording head with independent control
A matrix array of recording heads, wherein each head is independent from another both in terms of its magnetic circuit and excitation conductors. Each individual head has a planar magnetic circuit...
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6646825 |
Data storage using disk media
A first actuator for controlling positions of all of a plurality of heads within a wide area and a plurality of second actuators for individually controlling the heads within small areas are...
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6633446 |
Magnetic reproducing apparatus and reproducing circuit to be applied to the apparatus
A reproducing circuit for a MR head is proposed, wherein a MR head is interposed between a pair of current source circuits and a feedback amplifier is provided for controlling the current of the...
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6594101 |
Read head protection circuit and method
A circuit ( 80 ) and method ( 84 ) for protecting read heads ( 18 ) of a hard-disk drive system ( 100 ). Capacitor C 1 is controllably coupled to a dummy head R dummy during a V bias mode, so...
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6594097 |
Reproduction amplifier circuit of hard disk drive
The overvoltage applied on a head during switching of the head is prevented. At the time when the head switching signal changes, a switch S 4 for turning on/off an operational amplifier Gm 1 is...
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6587296 |
Capacitor bias recovery methodology
A preamplifier circuit for a hard disk drive system comprises a preamplifier circuit having a bias voltage circuit stage associated therewith. The preamplifier circuit further comprises a current...
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6577464 |
Magnetic recording device having first actuator for coarse adjustment and second actuator for fine adjustment
In a magnetic recording device, a control element placed on a flexible wiring board between a control device and first actuators includes a plurality of actuator-driving-signal connecting terminals...
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6538835 |
Position signal distortion compensation during a disc drive seek
Apparatus and method for compensating for position signal distortion during a disc drive seek. A disc drive has first and second data recording surfaces on which tracks are defined, a moveable...
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6538832 |
Single ended preamplifier having multiple first stage banks for improved noise characteristics
In hard disk drives (HDD), a magnetic read head moves over a portion of the hard disk when reading data. A preamplifier, having an initial amplification stage of the single ended type, connects to...
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6532126 |
Head switching sequence in a disc drive employing head bias currents
An apparatus and method are disclosed for minimizing damage to a disc drive during head switching operations. The disc drive comprises a plurality of magnetic recording surfaces to and from which...
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6493171 |
Adaptive skew setting for a disk drive
A method of manufacturing a disk drive ( 10 ) including determining and implementing skew values for each head ( 12 a- 12 d ) of the disk drive ( 10 ) during a production test phase is provided...
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6493160 |
Pseudo raid implementation within a single disk drive
A single disk drive uses data mirroring techniques to store data within the drive. Each piece of data received by the disk drive for storage is written to at least two different storage locations...
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6483654 |
Disk drive recording apparatus having actuator arm with dual heads and head switching control method
A disk drive recording apparatus includes an actuator arm with first and second heads extending from the actuator arm for writing and reading data to and from a first surface of a disk recording...
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6449112 |
Tape recorder having a driver circuit for a matrix head
Tape recorder having a group of write heads which are arranged like a matrix in rows and columns, with each write head assigned in one row line and in one column line, and having a driver circuit...
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6437937 |
Disk drive with high speed read/write capability
The present invention is directed to a disk drive that utilizes a multi-stage actuator associated with two or more heads that are each associated with a separate disk surface to realize high speed...
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6424485 |
Adaptive skew settings for a disk drive
A method for improving disk drive performance by adaptively calculating skew values for each drive. During a production phase of the disk drive manufacturing process, skew values are calculated...
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