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5084791 |
Head position control system for fixed drive including position encoder, temperature sensor and embedded fine servo information
A micro-Winchester disk drive subsystem includes a data block sequencer, cache memory and interface for a host computing machine. The drive includes a base and a plurality of non-removable directly...
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5079654 |
Data transducer position control system for data transfer apparatus employing dislike record media
A disklike record medium such as a magnetic data storage disk, and a closed-loop servo control system for positioning a transducer such as a magnetic read/write head on any of a multiplicity of...
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5073834 |
Disk file or tape drive with high servo sample rate embedding additional servo sectors within individual data sectors
A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal...
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5073833 |
Dual sector servo system for disk file with separate read and write heads
A method and servo system is provided to compensate for misalignment of separate read and write heads when reading and writing data on a magnetic disk. Two sets of servo information are generated...
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5070421 |
Magnetic disk system having tracking control using recorded information
A magnetic disk system comprises: a magnetic disk in which servo information is stored deeply in the appropriate fields Es longitudinally separated from the data field ED into which information of...
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5065382 |
Disc memory apparatus
A disc memory apparatus comprises: transducer means for reading and writing information on a disc; at least one disc medium having a plurality of concentric tracks each of which is divided into...
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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...
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5051851 |
Method and apparatus for positioning head on the basis of premeasured amount of displacement
The magnetic disk apparatus having improved tracking performance, includes a head for accessing a magnetic disk which is rotated, a displacement detector, a head position controller, a table and a...
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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...
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5047880 |
Magnetic disk pack with a servo recording surface
A magnetic disk pack includes a plurality of coaxially stacked magnetic disks on one of which is formed a servo recording surface for generating a servo positioning signal. The servo tracks on the...
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5027234 |
System for detecting a reference track of a disc storage unit
A read/write head which is usually used for reading out and writing information from and into the surface of the disc and the servo information recorded on the disc as a position sensor. Servo...
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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...
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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...
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5023857 |
Optical information storage apparatus including eccentricity compensator
An optical information recording and/or read system comprises an optically readable record carrier (1) and an optical read and/or recording apparatus (FIG. 2). The record carrier (1) is provided...
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5021898 |
Head positioning control method and apparatus
A head positioning control system has a speed control mode in which a head is moved by controlling a speed of said head and a position control mode in which the head is positioned onto a target...
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5012363 |
Servo pattern writing method for a disk storage device
In a disk drive device having multiple disks on a spindle, one of the disks is written with a servo pattern prior to assembly of the servo disk with blank disks into the disk enclosure. The servo...
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5010430 |
Head slider arrangement for magnetic disk storage device
A magnetic disk storage device has a magnetic disk with a storing/reproduction region formed thereon and a head slider facing the disk surface with a plurality of parallel projections to generate...
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5005089 |
High performance, high capacity micro-winchester disk drive
A micro-Winchester disk drive subsystem includes a data block sequencer, cache memory and interface for a host computing machine. The drive includes a base and a plurality of non-removable directly...
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4984901 |
Magnetic recording disc having sector reference zone, device for reading same, and magnetooptical memory optoelectronic employing said device
A mode of writing on a magnetic recording carrier (DISC) where the information is distributed over a plurality N of tracks, each track being associated with at least one reference zone (ZRP ij )...
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4982297 |
Head positioning system for compensating for erroneous detection of recorded position error information
A head positioning system includes a calculating circuit for outputting a signal u k corresponding to an equilibrium of a step motor for driving a head on the basis of a position error of the head...
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4977471 |
Method for servo formatting disc media for a floppy disk drive
A method for servo formatting disc media for a disc drive. The method includes (a) establishing a first timing decode pattern of transitions that precedes a first alignment pattern of transitions,...
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4977470 |
Track-following control system for magnetic disk drive
A track-following control system for a magnetic disk drive according to the present invention includes a magnetic disk, a magnetic head, a position error signal generator, a controller, and a...
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4967292 |
Head position controller for a disc storage unit
A head position controller for a disc storage unit comprises a plurality of disc surfaces, and a plurality of read/write heads corresponding to the disc surfaces. Servo information is written into...
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4964009 |
Magnetic disk having an index area and a limited number of radially extending servo sections
A magnetic disk, which is used for recording and reproducing data with a read/write head. The magnetic disk has an index area with an index signal recorded therein and a plurality of servo sectors...
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4954906 |
Position control system for a magnetic storage device using a small sized disk
The present invention provides an improved positioning control system for a hard disk device, wherein a servo burst signal for the head positioning is stored at two points on the circumference of...
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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...
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4920462 |
Disc drive fine servo velocity control and method for head positioning relative to a disc
A disc drive 22 having a head 26 actuated by an actuator 32 for seeking out a destination track 30 includes servo velocity control circuitry 51 and servo position control circuitry 41. The servo...
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4920434 |
Fixed disk drive
A higher performance, higher capacity, low cost fixed (Winchester) disk drive avoids the need of a servo surface and servo channel for head positioning by use of a mass balanced rotary actuator, a...
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4914725 |
Transducer positioning servo mechanisms employing digital and analog circuits
A track-seeking system for an optical disk using a velocity control loop with partially-digitized velocity measurement. A quadrature signal is generated based on summing the halves of a position...
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4912576 |
Method for writing a servo pattern
Servo data, distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of one type of servo pattern, with...
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4910617 |
Disk drive head positioning servo system utilizing encoded track zone information
The invention is directed to a head positioning servo system for disk drives employing a dedicated servo surface. A plurality of servo cells are recorded on the servo surface each including a sync...
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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...
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4905109 |
Process for optimizing head position to overcome disk misclamping and imperfections
A process allows a disk drive system to optimize head position in order to minimize the effects of track variations due to disk misclamping and imperfections. The process utilizes a transducer head...
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4896228 |
Magnetic disc apparatus having improved head position control
A data recording magnetic disc apparatus having a plurality of recording surfaces formed on one or more discs has a single servo sector containing servo data for transducer position control...
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4884152 |
Method for restoring track 0
A method for restoring the head to the track 0 in a disk drive unit which utilizes a stepping motor to position the head, the method comprising positioning the head to a position outside track 0 by...
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4875114 |
System for detecting a reference track on a disk surface in a disc storage unit
In a system for detecting a reference track on a disc for a disc storage unit, servo information for detecting an off-track amount of a position of a read/write head relative to the track is...
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4868470 |
Apparatus and method for detecting a true average of N signal samples
A true average peak detector includes an input capacitor having a capacitance C and an output capacitor having a capacitance nC. N voltage samples are successively stored on the input capacitor and...
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4833551 |
Dual head servo system and method for a magnetic disk
A servo system for a removable disk having twice the servo information per disk track. The disk is encoded such that the servo sectors on one surface of the disk are angularly off-set and are...
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4831471 |
System for positioning a magnetic head at a center line of a floppy disk track
A head positioning system capable of positioning a magnetic head at the center line of a target track of a floppy disk at high speed, in which a positioning controller prepositions the magnetic...
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4825310 |
Method and apparatus for recording servo synchronization information
A servo system for flexible magnetic disks such that the synchronization pulses do not have to be perfectly aligned. The disk is encoded such that consecutive servo tracks alternate between having...
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4823212 |
Sampled servo code format and system for a disc drive
The system and method for normalizing the amplitude of servo code derived signals in a disc drive, includes an improved embedded servo code format of separate magnetic dibit fields, recorded in...
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4816938 |
Process for determining data disk track centers
A process for determining the center of data disk tracks. The transducer head is positioned to one side of a track. The head repeatedly reads the track and microsteps across the track. The number...
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4809120 |
Head position control system
A plurality of reference information regions on disc surfaces are displaced from each other on respective disc surfaces with respect to spatial relative positions of heads corresponding to...
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4797757 |
Servo head positioner with pulse adjusting circuitry
A servo control apparatus which performs accurate servo control has a voltage controlled oscillator which provides a signal which has an oscillation frequency based on the servo information stored...
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4783705 |
High capacity disk file with embedded sector servo and SCSI interface
A disk data storage subsystem includes a head and disk assembly. A plurality of sectors in data tracks include a servo portion containing a prerecorded pattern of a plurality of repeating, time...
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4779148 |
System and method for detecting deviations in the positioning of a head relative to a track on the disc of a disc storage unit wherein the unit generates a ramp signal having a gradient determined by the position of the track on the disc
A system for detecting an off-track amount of a present head position with respect to a normal position of a desired track on a disc in a disc storage unit in which a closed loop control is...
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4766508 |
Burst integral detecting embedded servo disk tracking system
In a floppy disk drive, the head position is controlled in accordance with prerecorded sets of sinusoidal bursts recorded first on the right side of each track and then on the left side of each...
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4737869 |
Magnetic disk having data area and index servo area and servo system for positioning read/write head on magnetic disk
A magnetic disk comprises a data area and a single index servo sector area embedded in the data area. The servo sector has three or more servo information pattern sections formed side by side in...
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4688119 |
Detection and amplification circuit
A disk drive control system including servo sectors written on a disk, with each sector containing three sets of marker pulses arranged so that three adjacent marker pulses from each of the sets...
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4656538 |
Disk drive control system
A disk drive control system includes servo sectors written on a disk, with each sector containing three sets of marker pulses arranged so that three adjacent marker pulses from each of the sets...
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