Matches 201 - 250 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6496321 Magnetic recording/reproducing device using composite head  
A magnetic recording/reproducing device comprises a recording head for magnetically recording a signal on a magnetic recording medium along a predetermined track, and a reproducing head member...
6493172 Disturbance rejection of mechanical interaction for dual-actuator disc drives using adaptive feedforward servo  
The present invention incorporates an add-on adaptive feedforward controller into the existent track-following servomechanism of a dual-actuator disc drive to suppress the disturbance caused by...
6490118 Adaptive h-infinity hardware controller for disc drive actuator control  
Apparatus and method for generating control inputs for a disc drive dual stage actuator having primary and secondary actuator motors used to maintain a head adjacent a rotatable disc surface. An...
6469862 Method and apparatus for improved servo signal filtering in read channels  
A read channel network of a magnetic data storage device receives analog signals representative of user data and servo data, wherein the servo data is usable to position a read/write magnetic head....
6469861 Head positioning apparatus and method therefor  
A head positioning control apparatus and method which compensates for positional deviation of a magnetic head with respect to the positioning of the head on a particular track of a disc recording...
6466394 Storage device and method of detecting a position of a head on a disk of the storage device  
The storage device comprises a magnetic disk having a servo region with a two lines of servo pattern for each track, a servo demodulator for detecting a position of a head on the disk according to...
6456450 Method and apparatus for reducing track misregistration due to digital-to-analog converter quantization noise  
A method and apparatus for reducing track misregistration due to digital-to-analog converter quantization noise. In hard disk drive (HDD) servo control systems, quantization noises (or roundoff...
6445540 Linear air bearing with vacuum stiffener  
One aspect of the invention relates to an apparatus and method for loading and securing a disc drive head disk assembly (HDA) in a servo track writing apparatus. The HDA includes a base, a disc...
6445522 Disk device and method of generating signal representing head  
A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk...
6437935 Method and apparatus for a real and positional optimization of a storage disk data zone  
A data zone optimization method and architecture for optimizing the location of the data zone on a data storage disk is disclosed. The data zone is preferably biased toward the outer diameter of...
6433950 Disk drive with radially dispersed servo bursts  
A disk which incorporates a variable-phase servo burst pattern is disclosed. The disk has servo information thereon. The servo information includes a first servo burst pattern written on a first...
6429994 Method and apparatus for providing servo gain linearization for a magneto-resistive head  
A method and apparatus for generating servo information used in positioning the read head of a hard disk drive. The apparatus comprises a disk having a plurality of tracks, at least one of which...
6421197 Optimal reader/writer offsets and write fault thresholds in a disc drive  
A method for optimizing data transfer performance in a disc drive through selection of optimal reader/writer offsets and write fault thresholds. An initial offset for a selected track is determined...
6417982 System and method for identifying and filtering a head suspension assembly resonance frequency  
A method and apparatus for identifying and filtering a resonance frequency of a support structure supporting a read/write head in proximity with a data storage medium involves obtaining a...
6414813 Rotational acceleration correction in a disc drive  
A disc drive controller corrects for rotational vibration disturbances of a head position. The controller includes multiple sets of adjustable controller gains. The controller compares an...
6407878 Horizontal loader for high density servo track writing  
One aspect of the invention relates to an apparatus and method for retaining a disc drive head disk assembly (HDA) during a servo track writing procedure. The HDA includes a base, a disc stack...
6407877 Recording/reproducing method and apparatus in which head driver is unlocked when medium is loaded and when track position information formulation based on optical signal input has been completed  
In a recording/reproducing apparatus, a controller includes a counter responsive to incoming track feed requesting pulses to count the number of the pulses, a head movable state detection unit for...
6407876 Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head  
A sector servo type magnetic disk apparatus is provided with, in addition to servo signals, a sensor such as an accelerometer for detecting a state of a magnetic head or a support for the magnetic...
6404570 Disk drive with adaptive channel optimization  
Adaptive channel optimization in a disk drive is achieved by selecting a track of the recording medium and then writing a first data pattern to opposite sides of the selected track. The first data...
6396654 Embedded servo writing method and apparatus for hard disk drive  
A method and apparatus for writing a servo signal for controlling the position of a head on a disk during the manufacture of a hard disk drive. The present invention provides a method and apparatus...
6388833 Method for manufacturing a disk drive having an overwriteable clock track  
A method of manufacturing a disk drive having a rotary actuator and a disk. The rotary actuator includes a disk transducer head for reading and writing on the disk. The method includes the steps of...
6377416 A/D with digital PLL  
A digital arithmetic operation circuit includes a plurality of arithmetic operation blocks, a control signal generator and a selector. The plurality of arithmetic operation blocks receive a...
6366423 Data storage medium having servo pattern of different phase and tracking method thereof  
In a data storage medium, which includes a servo information area where information on the position of a head is recorded and a data information area where actual data information is recorded, the...
6335845 Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head  
A sector servo type magnetic disk apparatus is provided with, in addition to servo signals, a sensor such as an accelerometer for detecting a state of a magnetic head or a support for the magnetic...
6327111 System for reducing controller delays during sequential data transfers in a disc drive  
A system for controlling movement of a head over tracks on a disc in a disc drive includes a servo positioner for positioning the head over a desired track, a sectoring circuit for determining when...
6324030 Digital pes demodulation for a disk drive servo control system using synchronous digital sampling  
A digital servo system for a disk drive provides servo information signal demodulation. The system includes a digital demodulator including a burst signal accumulator that accumulates terms...
6310741 Magnetic disk apparatus with data track reassigning function  
When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track...
6304408 Apparatus and method for a reduced seek-to-track time fuzzy rule controller for a hard disk drive read/write head actuator  
A controller for read/write head actuator of a hard disk drive system includes a feedback unit providing a voltage to a servo-actuator motor. The feedback unit includes a first fuzzy logic...
6292318 Disc recording/reproducing apparatus and medium having spiral data track  
A data recording and/or reproducing apparatus which scans a head over a disc on which a servo pattern for moving the head to a predetermined position is recorded in an arc forming a part of a...
6266205 Parallel servo with ultra high bandwidth off-track detection  
A magnetic storage system having one or more rotating disks is disclosed. In a preferred embodiment, each rotating disk has two magnetic surfaces which each contain a number of tracks. Each track...
6259576 Method and apparatus for hard disk drive with self-servowriting capability  
A servowriting method for a hard disk drive is performed by detecting a servo-pattern on a first surface of a disk with a trailing coil of a first head slider positioned over the first surface of...
6243226 Apparatus and method for digital servocontrol in a data storage system using disk recording media  
The present invention relates to a servo control apparatus of a disk recording system and particularly to a servo control apparatus and method which are capable of controlling position of a head...
6243223 Disk drive with servo burst phasing for improved linearity and off-track performance with a wide reading transducer  
A disk drive has a sampled servo system controller and a disk with a plurality of angularly spaced servo wedges. Each of the servo wedges contains angularly aligned servo burst fields that are...
6240238 Magnetic disk device  
A magnetic disk device that has a sufficient tracking control capability and a sufficient capability, and has the rotational speed of a magnetic disk reduced to record moving-image information. A...
6239932 Method of and arrangement for formatting a magnetizable medium  
An arrangement for recording servo signals on a magnetic tape has first and second adjoining write heads respectively driven by first and second write signals. Each write signal includes a servo...
6222691 Interleaved dibit detection for direct access storage device (DASD)  
A method for detecting servo data and an interleaved dibit detection apparatus are provided for servo data detection in a direct access storage device. The interleaved dibit detection apparatus...
6212023 Quickly written servo-patterns for magnetic media including depositing after writing  
Servo-pattern information is magnetically recorded on a product disc by magnetic print-through from a master medium. The master servo-writing medium is brought into close proximity with the product...
6204990 Circuit and method for determining the position of a read head for a magnetic disk drive device  
A servo-demodulator for a pair of alternating signals generated by a magnetic disc read head and indicative of the position of the read head in relation to the center of a recorded track. The...
6201659 Cartridge-loading apparatus with tilting bias coil assembly  
The mechanism for loading and unloading a disk cartridge uses two sliders (one on each side of a base plate), which move in opposite directions under the influence of a tiller. Each slider has a...
6198591 Multi-task operating system for a disc drive  
A multi-task system employs a single interrupt occurring at fixed time intervals to initiate the control functions. The actuator control, servo control and spindle control routines are operated on...
6181504 Method for measuring track pitches of a hard disk drive  
A hard disk drive (HDD) magnetically reading and writing digital data, and measuring the track pitch of a hard disk drive to detect more accurately the position error signal on each disk. The track...
6178058 Off-track write protection method and system for induced mechanical disturbance on a disk drive  
A method and apparatus for protecting a disk from overwrites during mechanical shock. If the PES exceeds an off-track threshold for a predetermined number of servo samples, the read/write is...
6175465 Head positioning control system for use in a disk storage drive  
A servo system uses a disk on which two pairs of burst data items A and B and burst data items C and D are prerecorded, and the servo system performs positioning control for positioning a head...
6163425 Magnetic reproduction apparatus having MR head in which electromigration occurring in MR head is suppressed  
In a magnetic reproduction apparatus having an MR head, electromigration occurs when a sense current is supplied to the MR head is suppressed, and the service life and reliability of the magnetic...
6157511 Disk drive with variable-phase servo burst patterns  
A disk which incorporates a variable-phase servo burst pattern is disclosed. The disk has servo information thereon. The servo information includes a first servo burst pattern written on a first...
6153997 Disk apparatus and method of controlling disk apparatus  
A disk apparatus has a position signal detector for detecting the position of a head with a specified sampling period, a controller operating a manipulated variable to control positioning of the...
6130791 Magnetic disk drive having read channel in which low-frequency cutoff is set relatively high to cope with thermal asperity  
A magnetic disk drive includes a circuit portion having transfer characteristics for determining low-frequency cutoff characteristics in a transfer line ranging from a signal output terminal P1 of...
6125154 Digital servo channel for recording apparatus  
A servo channel digitally processes the data read from a magnetic media. The channel uses both edges of a system clock to detect peaks and generates position error systems by an area-based...
6122131 Adaptively-controlled disk drive assembly  
A disk drive assembly including circuitry for adaptively selecting performance characteristics of the assembly. The performance characteristics are adaptively selected responsive to a balancing of...
6122117 Method for digitally demodulating position signals recorded on recording media  
Disclosed is a method of demodulating a position signal in a magnetic disk device for reading servo burst signals, which have been recorded in a servo area of a magnetic disk, by a head, and...
Matches 201 - 250 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >