Matches 351 - 400 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5272578 Method for writing a uniform servo code into a magnetic disk drive  
A method for writing a final track positioning servo code into a servo code signal region of a set of disks of a magnetic disk drive. the method includes writing a first temporary servo code in an...
5270880 Predictive read-write inhibit decision using fuzzy logic  
A method for predicting and avoiding data errors by predicting disk drive read-write inhibit requirements in response to at least two parameters including a head position error and velocity with...
5270878 Magnetic recording and reproducing apparatus  
In a magnetic recording and reproducing apparatus, in order to prevent the address code data for identifying the cylinder number of a recording medium from producing continuous erase data, address...
5267110 Rotary actuator for a direct access storage device  
A rotary actuator head driver for a direct access storage device includes a transducer head moving in a radial direction across a disk surface for reading and/or writing data on a plurality of...
5260846 Compact hard disk assembly having a head carriage positioning arts located within the outer circumference of a hard disk  
A hard disk drive for recording/reproducing data to and from a magnetic disk. The hard disk drive includes a base, a magnetic disk disposed on the base, a magnetic head which records/reproduces...
5257149 Disc drive with offset address field  
An offset address field in a magnetic disc storage system which uses a dual gap head and a rotary actuator. The dual gap head has two gaps, one for reading information and the other for writing...
5255136 High capacity submicro-winchester fixed disk drive  
A miniature disk drive achieves storage densities of at least approximately 1700 tracks per inch per storage surface of a storage disk defining a series of radially extensive servo sectors embedded...
5243479 Mounting structure for information recording and reproducing apparatus  
A housing for an information recording and reproducing apparatus is adapted for increased storage capacity and an increased operating speed by placing a relatively larger number of relatively...
5241431 Apparatus for adjustment of position slope for servo  
In a disk drive servo, position slope is adjusted automatically, by referencing on the amplitude of position signals at the "half-track point".
5229901 Side-by-side read/write heads with rotary positioner  
A disk drive (10) includes a head positioner (16) on which are mounted separate read and write heads (52 and 54) that are spaced apart in the direction radial of the disk axis. Headers (50) on a...
5210662 Tracking control apparatus for magnetic disk  
There is provided a tracking control apparatus for controlling the position of a recording and reproducing head with respect to a recording track by detecting a plurality of kinds of servo marks...
5206570 Actuator servo compensation method  
An actuator control loop for controlling head position in a rotating media data storage system. The invention applies the compensation zero to the PES prior to summing it with the integrator. This...
5202821 Sampled-data control system exhibiting reduced phase loss  
An automatic digital control system includes a proportional integral derivative (PID) compensator in which the digital differentiator portion, with its associated zero-order hold, is implemented...
5189578 Disk system with sub-actuators for fine head displacement  
A magnetic disk system utilizes both of voice coil motor and a piezoelectric element provided on a head supporting arm to precisely position a head to a predetermined position on a disk. The...
5177652 Dual-actuator transducer position control apparatus for seeking and following track on rotary disk  
In a rotary-disk transducer position control apparatus and method in which positional information concerning a transducer relative to a rotary disk based on a signal is obtained from the transducer...
5172353 Track seeking control apparatus for use in data recording/reproduction systems having data tracks thereon  
A track seeking control apparatus includes an optical head for generating a signal comprising a train of track cross pulses when it crosses tracks on a recording medium. A first counter counts the...
5166844 Disc drive apparatus having a mechanism for opening/closing the shutter of a disc cartridge  
A disc drive apparatus including a cartridge holder for detachably holding a disc cartridge, which is provided with a shutter slidingly moving in one direction from a closed position to open...
5165082 Method for writing servo signals on a servo disk in a magnetic disk apparatus  
Servo data to be stored on a servo disk in a magnetic recording apparatus for positioning a data head of the magnetic recording apparatus to a data disk of the magnetic recording apparatus, are...
5163162 System and method for data recovery in multiple head assembly storage devices  
A systematic method for detecting which head in a multiple head storage device contains errors and may be misaligned, and correcting for misalignment so that the data can be recovered. The...
5162955 Apparatus for writing servo information onto a magnetic disk  
An apparatus for writing servo tracks on a magnetic disk in a head disk assembly having a head, a moveable actuator for positioning the head relative to the disk, and an actuator drive for moving...
5153789 Methods and apparatus for optimizing track seeking operations  
A method and apparatus for providing a dynamic fine track seeking operation that adaptively fine tunes the entrance criteria used to determine when the head is on track for the specific disc drive...
5153786 Extended range servo system for positioning a disk drive head over a selected track  
A magnetic disk drive wherein the radial position of a sensing head being positioned by a servo system is ascertained by the sensing of servo signals arranged in successive groups of tracks on a...
5140571 Disk drive apparatus with intermittently operated servo signal processor for low power consumption  
A disk drive apparatus which consumes less power to control the movement of a head on the basis of servo signals which are intermittently reproduced from a disk-like recording medium has a servo...
5140476 Apparatus and method for tracing a track center of a magnetic disc  
The deviation of head and track at a most outside position conference track (PtO) and at a most inside position conference tract (Pti), the deviation value is processed in accordance with the...
5136441 Position control device for positioning magnetic head on selected track  
A position control circuit for use in a servo circuit generate a position error signal corresponding to a position error between a head and a selected track of a disk at a time of position control...
5136439 Sectored servo position demodulator system  
A demodulator system demodulates position information signals provided by a transducer in response to position information. The position information is read from a quadrature field and a normal...
5119254 Data transducer position control system for rotating disk data storage equipment  
A servo calibration method is disclosed for a disk drive including a rotating data storage disk journalled to a frame and having a multiplicity of concentric data tracks defined on a major surface...
5111348 Magnetic head including thermoelectric positioning means  
A thermoelectrically adjustable magnetic head for reading and writing information comprising a read/write core, and position detection cores on both sides thereof generating compensatory output in...
5089757 Synchronous digital detection of position error signal  
A sample data position error signal detection means. This invention has application in a digital servo in a magnetic media disk drive environment. In particular, the invention relates to the...
5087997 Position control system for read/write device  
A position control system for a read/write device for fast positioning the read/write device at a particular track of a disk having a tracking pattern in the recording medium. The system having a...
5077716 Optical recording and reproducing system having an accurate high-speed optical head positioning apparatus  
An optical recording and reproducing system having an accurate high-speed optical head positioning apparatus. In one embodiment, a positive acceleration is applied to the optical head until the...
5073832 Carriage controlling apparatus for floppy disk apparatus  
In a discrimination mode for discriminating a track density mode of an FDD using a carriage mechanism of the lead screw type, on the basis of a reciprocal seek operation of a magnetic head, when a...
5072318 Disk file with adaptive cancellation of nonrepeatable disk runout  
In a data recording disk file, a digital servo control system generates an estimate of the sinusoidal function representative of the dominant component of nonrepeatable runout (NRRO) and derives...
5062023 Disk file servo loop with improved track settling  
Reduced integration time within a lead-lag compensation circuit within a disk drive head positioner servo loop is reduced in the presence of a feed back position error signal which includes a bias...
5062019 Method and apparatus for accurately positioning a magnetic recording and reproducing head  
A magnetic disk recording and reproducing apparatus is provided having a carriage which supports a magnetic head moving in radial directions about a magnetic disk which is rotatably supported on a...
5053899 Exact position control of a relative position between a magnetic head and a recording medium  
For controlling a relative position between a magnetic head (15) and a recording medium (10) having a control area (14) indicative of a tracking axis for the magnetic head, a position controlling...
5050016 Disk drive servo system using gain limited high-frequency track-following compensator  
The disk drive system includes an actuator, responsive to an adjustment value, for adjusting the position of a data head with respect to data tracks located on the surface of a disk, and a...
5041927 Magnetic disc driving apparatus having speed and position control  
A magnetic disc driving apparatus for positioning a magnetic head by a servomechanism, which, when control mode of positioning control is switched from speed control to tracking control, switches...
5027233 Method for determining servo position data in a disk drive  
Shown is a disk drive arrangement with servo-mechanism for controlling (thin-film) head position, etc.; the servo having a disk face dedicated to servo tracks, rendered in "Quad" code, with special...
5023732 Magnetic disk apparatus having a circuit for detecting the position of servo information recorded on a magnetic disk  
A magnetic disk apparatus has a circuit for detecting the recorded position of servo information, used for aligning a magnetic head, on a target track of a magnetic disk. The circuit discriminates...
5015932 Actuator driving circuits  
An actuator driving circuit for a servocontrol system comprises an amplifier for amplifying an error signal obtained in the servocontrol system to produce a driving signal supplied to the actuator,...
5010535 Apparatus and process for measuring data disk runout and acceleration parameters  
Runout and acceleration measurements are provided for a disk drive type device using a closed loop actuator to position a transducer element relative to circular and/or spiral tracks on a recording...
4989103 Adjustment of position slope for disk drive servo using half-track point  
In a disk drive servo, position slope is adjusted automatically, by referencing on the amplitude of position signals at the "half-track point".
4980783 Apparatus for automatically applying servo track data to a selected servo surface of a hard disk within a hard disk assembly  
A station for writing servo track and clock information onto a hard disk drive assembly (HDA) automatically positions and accesses a pallet assembly, including the HDA, in accordance with...
4955010 Constant velocity track jump servo system for disc players  
A record disc reproducing apparatus, which can be used for searching for a desired track location rapidly, including a pick-up device for reading data from the disc and which is movable is a radial...
4940924 Positioning control apparatus  
The positioning control apparatus includes a feedback compensatory compensatory system for performing high-accurate positioning and a feedforward compensatory system for carrying out high-speed...
4933785 Disk drive apparatus using dynamic loading/unloading  
A disk drive apparatus is disclosed for primary use with portable, laptop or other information storage systems. The disk drive apparatus includes one or more about 2.5 inch hard disks. A rotary...
4928192 Process for identifying disks and automatically configuring a disk drive system  
A process for identifying disks and automatically configuring a disk drive system to any one of a variety of disk patterns as embedded in firmware in a controller of a disk drive system. The...
4912572 Magnetic disk drive with effective AGC control of servo signals by selectively varying A/D converter reference level  
A magnetic disk drive provided with a computational control circuit for changing the reference level of the A/D converter so that the outputs of A/D conversion are kept constant at all times, which...
4910616 Servo track centering for magnetic disc read/write head  
A magnetic storage disc 1 has a plurality of concentric data tracks, with circumferentially staggered servo centering signals B, C recorded flanking each track in a sector shaped region of the...
Matches 351 - 400 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >