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7349172 Certifying concentric data in eccentric servo data tracks of pre-formatted media  
Apparatus and method for rotating a data storage media having pre-formatted servo data tracks adjacent a data transfer member, and retrieving readback data with the data transfer member along a...
7330327 Servo writing a disk drive by writing discontinuous spiral tracks to prevent overheating  
A method of servo writing a disk for use in a disk drive is disclosed by writing discontinuous spiral tracks on the disk to protect against overheating the head and/or preamp circuitry. A write...
7319570 Random vibration and shock compensator using a disturbance observer  
A data storage device adapted to compensate for physical disturbances has a storage medium, a read-write mechanism positionable relative to the storage medium, and a disturbance observer. The...
7292403 Low frequency disturbance compensation control device and disk drive using the same  
A servo control device for a disk drive capable of effectively compensating for a low frequency disturbance incoming to the disk drive is provided. The servo control device includes: a state...
7248426 Servo writing a disk drive from spiral tracks by shifting a demodulation window an integer number of sync mark intervals  
A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal...
7230786 Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon  
The present invention is directed to a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon. A...
7196865 Recording apparatus having discoid record mediums  
A recording apparatus capable of securely reading out data for causing a head to follow along circular tracks set virtually. Therefore, on-track control along the virtual tracks is possible by the...
7177113 Magnetic recording disk drive with switchable rotational vibration cancellation  
A magnetic recording disk drive with rotational vibration (RV) cancellation uses the position error signal (PES) and the signal from a RV sensor to determine when to enable and disable RV...
7136253 Method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information  
The present invention is directed to a method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information. In one embodiment, a disk...
7088533 Method of self-servo writing in a disk drive using a spiral pattern  
A disk drive includes a head and a disk, spiral patterns are located on the disk, and the disk drive self-writes servo patterns on the disk using the spiral patterns as a reference for servoing the...
7079343 Time-based sectored servo data format  
The invention combines the benefits of sectored servo data with the benefits of time-based servo data. Recording media such as magnetic tape, magnetic disks, optical tape and optical disks can...
7068459 Adjusting track density by changing PES algorithm when servo writing a disk drive from spiral tracks  
A method and apparatus is disclosed for writing product servo sectors to a disk of a disk drive to define a plurality of data tracks. The disk drive comprises the disk and a head actuated over the...
7035039 Magnetic head positioning control device, magnetic head certifier, magnetic disk certifier and head cartridge  
A piezo actuator is provided between a suspension spring and a head carriage. When a predetermined track of a magnetic disk is accessed by positioning a magnetic head in the predetermined track,...
7019937 Method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon  
The present invention is directed to method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon. The...
7019924 Patterned medium and recording head  
A magnetic recording system includes a patterned medium comprised of land areas and trough areas, a write element which writes the data to the patterned medium, and a read element which reads the...
6989954 Demodulating servo sectors and spiral tracks using common circuitry  
A method of manufacturing a disk drive by demodulating product servo sectors and spiral tracks written on a disk of the disk drive is disclosed. An external spiral servo writer writes a plurality...
6987636 Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive  
A method and apparatus is disclosed for adjusting the track density over the disk radius by changing the slope of spiral tracks used to servo write a disk drive. A plurality of spiral tracks are...
6972923 Magnetic recording medium and magnetic recording/reproducing apparatus using the same  
A magnetic recording medium has a substrate, and a servo signal recording magnetic layer whose magnetization is oriented in a direction perpendicular to a surface thereof, a non-magnetic layer and...
6950268 Disk drive  
In a disk drive, since high-frequency repeatable runout (RRO) components own low correlative relationships between adjoining tracks, a servo control system of a magnetic head is followed to the...
6947249 Method and apparatus for automatically determining an embedded runout correction threshold  
A method and apparatus for automatically determining an embedded runout correction threshold for a disk drive are disclosed. In prior systems, embedded runout correction thresholds were set for all...
6937423 Reducing effects of rotational vibration in disk drive  
A method of reducing rotational vibration effects in a disk drive by sensing vibration in a sensor and generating corresponding sensor data; deriving a statistical sensor (SS) value based on the...
6906485 Spindle motor control using a current profile to taper current transitions  
Method and apparatus for operating a motor. During a commutation state current is applied to a motor while field effect transistors (FETs) are held in an enable or disable state to effect current...
6853513 Magnetic scanning system  
A scanning device for scanning data-carrying disks. The disks include a magnetisable layer to and from which data is written and read using a magnetic transducer, such as a Giant Magneto-Resistive...
6831804 Method and apparatus for handling resonance effects in disc drives using active damping  
A method of handling resonance effects on disc drives includes the steps of monitoring a position error signal (PES) for an actuator arm of a disc drive, generating a feedforward compensation...
6819520 Use of momentum transfer actuators for motion control of flexible mechanical structures  
This invention discloses a method for controlling the position of flexible portions of a mechanical structure by attaching one or more Momentum Transfer Actuators on the flexible portions of the...
6785075 Self-writing servo and clock fields on a recording medium  
A disc drive with an information portion previously written on a rotatable disc surface, a servo write clock generator phase lock loop circuit controlling timing for writing a reference mark to the...
6760174 Adaptive fly height for error recovery in a disc drive  
A method of recovering data from a data sector through adaptive fly height to improve reliability of a disc drive is disclosed. Encountering a data error in a data sector initializes an error...
6747835 Method and apparatus for simultaneously measuring and calculating servo-related data  
A method and apparatus for simultaneously measuring and calculating servo-related data is disclosed. The method involves measuring the servo related data for a first track of a disc drive and then...
6721124 Method and apparatus for providing an intelligent settle scheme for a hard disk drive with dual stage actuators  
A method and apparatus for controlling the position of a computer hard disk drive transducer head are provided. According to the invention, an initial value compensation scheme is applied to a...
6631046 Servo track writing using extended copying with head offset  
The present invention proposes a new servo track writing technique called Extended Copying with Head Offset (“ECHO”). The read and write elements of the read/write head are offset from each...
6594104 Magnetic disk unit including temperature sensing of IC mounted on suspension  
In the magnetic disk unit comprising suspensions in each of which an IC is mounted on a load beam, a magnetic head displacement caused by the warp of the load beam occurring due to heat generated...
6538839 Disk drive employing adaptive feed-forward vibration compensation to enhance a retry operation  
A disk drive is disclosed comprising a head, and an actuator, responsive to an adjusted control effort signal, for actuating the head radially over a disk. An adaptive feed-forward signal is...
6538834 Servo controller and servo control method  
A servo controller for correcting a read position of a head when reading data recorded on a recording medium. In accordance with the amplitude ratio of data signals read from each segment of a...
6424486 Method and apparatus for positioning a read/write head of a hard disk drive  
A hard disk drive system ( 10 ) includes a rotating magnetic disk ( 16 ), and a support arm ( 22 ) which is supported for movement relative to the disk under control of a voice coil motor ( 21 ). a...
6411461 Data collection system and method for zero acceleration path correction  
A method of correcting track misregistration in a servo system for a disc drive including one or more discs includes positioning a head over a track located on a disc and maintaining the head...
6388413 Head switch seek on disc drives with multiple recording heads  
A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator...
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...
6268975 Tape drive utilizing encoded file markers to locate target positions  
The present invention provides methods and apparatus for locating target positions within an encoded data stream, where the encoded data stream incorporates special, reserved codewords to represent...
6259577 Method and apparatus for organizing servo data to expand data region and counting sector numbers from headerless servo format in a disk drive  
In the sector number counting method of the HDD using a disk as the recording medium having a plurality of servo sectors which are divided into several servo sectors groups, so that the first...
6249396 Magnetic media having partitioned and presaturated data tracks  
The present invention provides an apparatus and method of partitioning a recording medium data track into two longitudinal regions and erasing any preexisting signal on each region with a DC bias...
6160676 Storage disk apparatus and method of controlling same  
A storage disk apparatus has a storage disk having servo information, a plurality of heads for reading information recorded on the storage disk, a plurality of first actuators for accurately...
6130798 Hardware PES calculator  
In the disk controller in a hard disk system, the microcontroller is an integral part of the servo positioning system. The servo positioning system is the system responsible for positioning the...
6122134 Combined longitudinal and transversal tracking  
An information storage medium has at least a longitudinal bundle comprising three servo tracks (3, 4, 5). The bundle is arranged in consecutive tracking units (T(N)) of a determined longitudinal...
6091567 Modeling position error nonlinearity to improve servo performance  
An apparatus and method are disclosed for improving servo performance of a disc drive. The disc drive includes a head adjacent a rotatable disc on which data are stored on a plurality of tracks. A...
6067204 Disc drive servo pattern insensitive to read head  
In a disc drive, a position error signal (PES) can be generated that is insensitive to the read element's magnetic and physical geometry and micro-track profile, and that has a spatial domain...
6055121 Optimizing track address detection in a disc drive  
An apparatus and method for optimizing detection thresholds used to identify addresses of tracks in a disc drive having a head and a disc upon which a plurality of tracks are defined, the tracks...
6031682 Track trimming and orthogonal recording for cartridge tape  
A method and a system for recording and reading magnetic information on a linear tape are disclosed. A write head is disclosed that is wider than the read head. Tracks of discrete, elongate bits of...
5991115 Method and apparatus for determining separation between read and write elements of a transducer  
Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with...
5953178 Magnetic disk apparatus  
A magnetic disk apparatus includes a dual head equipped with an MR head for reading data and an inductive head for writing the data. One ID portion and one servo pattern are disposed in one sector...
5930067 Multi-harmonic compensator for track following in disk drives  
An adaptive servo system for a disk drive compensates for a track being off center or distorted by analyzing the spectral content of the radial variation of the centerline of a track relative to a...
Matches 1 - 50 out of 179 1 2 3 4 >