Matches 551 - 600 out of 762 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >
Match Document Document Title
5581420 Method and system for determining a radial positioning valve used for writing tracks at a desired track pitch  
A technique for writing a servo-pattern on a storage medium located in a recording device having an internal recording head. A timing pattern is generated on the storage medium with the internal...
5581418 Magnetic disk drive unit capable of determining data region position of data region that does not include position identification data  
A magnetic disk drive unit using a data surface servo system includes: at least one magnetic disk having a data surface, wherein a region in which servo information including a servo address for...
5579186 Magnetic disk unit and method for controlling the same  
In an idle state, servo information from all sectors is not used, but the servo information from every other sector or from every three or more sectors is used so that head positioning can be...
5576906 Synchronous detection of concurrent servo bursts for fine head position in disk drive  
Synchronous detection of fine position servo burst information with a data transducer having an electrical width not less than about two-thirds a width of a data track within a partial response...
5576910 Burst comparison and sequential technique for determining servo control in a mass storage disk device  
A burst magnitude comparator and an instruction sequencer are employed in a servo system controller to rapidly determine position correction information for moving a transducer head over the center...
5566034 Off-track detection with charge redistribution A/D circuits  
An apparatus for detecting off-track positioning of a disk read/write head seeking a selected data track on a disk having data tracks with embedded servo burst patterns recorded thereon. The...
5550685 Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal  
A method for applying an adaptive feed-forward waveform correction to a primary servo loop compensation signal in a rotating data storage apparatus. A position error signal is used to determine a...
5541783 Disk recording medium and disk drive unit wherein the product of the number of servo areas and the recording/reproduction mode switching time of the head amplifiers is 1200 or less  
A disk drive for magnetic disk of the sample servo type, having N (N≥200) servo areas, wherein the product of N and the recording/reproduction mode switching time Th (μs) of the head amplifiers,...
5539795 Sector pulse generating apparatus for multiple zone recording of a disk memory  
A sector pulse generating apparatus for multiple zone recording includes only first and second counters. The first counter counts reference clock pulses and outputs a present position signal. The...
5526211 Banded magnetic recording disk with equally-angularly-spaced servo sector  
A method and means is described wherein servo sectors written on a disk (or servo sections written on a tape) are equally spaced on a given track and read during seek, settle and track following...
5526202 Disk drive embedded servo system having a servo field with an asymmetrical position subfield  
An embedded servo system for a disk drive is disclosed. An asymmetrical position sub-field reduces the overhead of the disk position system. The sub-field includes at least two normal frame pairs...
5523902 Servo burst pattern for removing offset caused by magnetic distortion and method associated therewith  
An alternating "A/B" servo burst pattern for measuring and compensating for offset of the track centerline due to differential magnetic influence to the servo pattern, and a switching network to...
5523901 System for correcting transducer tangential skew in a disk drive system having two actuators  
In a disk drive system having two actuators, each said actuator having a plurality of transducers, said system employing a transducer switching procedure for switching between a first presently...
5523903 Sector architecture for fixed block disk drive  
A sector servo, zone bit recording disk drive includes a sector architecture in which the recording head locates and identifies data sectors without using data ID fields, but instead using...
5517371 Track sector detection system for rotating disk data storage apparatus  
A system for detecting the servo sectors of a rotating magnetic disk solely from read pulses representative of information read on the disk. Each servo sector has a first or intersector gap, an...
5517631 Miniature disk drive having embedded sector servo with split data fields and automatic on-the-fly data block sequencing  
A programmable data sequencer transfers fixed length data blocks between variable length storage segments of a magnetic storage disk and a buffer memory within a data storage device. The data...
5500776 Self-calibration for computer disk read/write offsets  
For disk drives having dual element heads, an invention for providing self-calibration of hard-disk writer elements to reader elements offsets. A method is provided for positioning a reader element...
5499232 Track format and record carrier system for split data field support  
The invention provides a track format and a record carrier system for supporting a track architecture where a first field, such as a data field, is split by a second field, like a servo field. The...
5483393 Disk drive having head positioning servo with improved servo read signal processing using median servo burst peak magnitudes  
A disk drive for use with an embedded head positioning servo system is disclosed. The disk drive includes a disk on the surface of which spaced-apart servo bursts are prerecorded in servo sectors....
5477402 Disk file with multiplexed servo system  
A disk file includes multiple disk surfaces, on which servo information is recorded, with an offset in azimuth from one disk surface to another. Each head comprises a magnetoresistive stripe for...
5477103 Sequence, timing and synchronization technique for servo system controller of a computer disk mass storage device  
A servo system controller for a disk drive device which includes a rotating mass storage disk incorporates a timing error determining circuit for determining rotational speed variations in the disk...
5475540 Magnetic data storage disk drive with data block sequencing by using ID fields after embedded servo sectors  
A magnetic data storage disk record carries a pattern of magnetic domains defining a plurality of concentric data tracks divided into data sectors by embedded servo sectors recorded at a...
5475544 Head positioning control device for a magnetic disk apparatus  
A head positioning control device for a magnetic disk apparatus has a head selection circuit for selecting one of a plurality of magnetic heads based on an external head address, a servo control...
5473482 Magnetic disk apparatus and method with actuator control using servo sector information read out at particular timings  
A magnetic disc apparatus controls the output timing of control current data by use of a servo estimation type observer. Servo information is read from a servo sector of a magnetic disc, decoded,...
5469113 Rectifier and integrator circuit for disk drive servo system  
A servo system for controlling the position of a read/write head in a disk drive is provided. The servo system includes two input terminals for sequentially receiving a plurality of input signal AC...
5459623 Servo field scheme for high sampling rate and reduced overhead embedded servo systems in disk drives  
In an embedded servo system for a disk drive, prerecorded servo information in each track of the disk includes a multiplicity of different length servo fields. Each track includes at least two...
5453888 Servo signal noise suppression in a sectored servo system by separating user data from servo data and filtering each with a specific filter  
In a hard disk drive of a sector servo type, two low pass filters having different filter characteristics are used. One low pass filter has uniform group delay characteristics to accurately detect...
5452285 Uniformly distributed servo data for optical information storage medium  
An optical information storage medium (e.g., disk) has an arrangement of optically detectable marks in a uniform angularly offset, polar array wherein each mark carries timing, tracking and...
5448429 Self-servowriting disk drive and method  
An embodiment of the present invention is a disk drive comprising a rotating disk with a recording surface, a transducer in communication with the surface and swept radially over the surface by a...
5444582 Disk drive servo control with pulse width and amplitude control for a position servo signal  
A disk drive servo control circuit for controlling a position of a head using servo information obtained from a disk at predetermined time intervals, the servo information being converted to a...
5442499 Method of detecting sector servo information in a disk system  
A method and apparatus for detecting sector servo information in a disk system, uses sector servo information with at least one auxiliary confirming code pattern provided in addition to...
5442498 Asynchronous track code encodement and detection for disk drive servo control system  
A disk head position control system having a disk head controller that moves a disk head relative to a surface of a magnetic media disk encoded with a plurality of tracks of a quadrature burst...
5440474 Magnetic recording disk with equally-spaced servo sectors extending across multiple data bands  
A magnetic recording disk has servo sectors that are generally equally spaced on a given track and read during seek, settle, and track-following operations. An algorithm is used to determine the...
5438559 Method for locating physical sectors in a fixed block architecture embedded servo disk file #14  
A data recording disk file is provided with a fixed block architecture sector format that eliminates the ID region. The servo region contains sector identification information in the form of a...
5436773 Enhanced linearity range for magneto resistive transducer servo by changing the direction of the bias current  
The linear range of a servo system for a magnetic storage device using a compared amplitude burst servo pattern and a magneto resistive (MR) sensor is enhanced by reversing the bias current. With...
5420730 Servo data recovery circuit for disk drive having digital embedded sector servo  
A method and apparatus are provided for recovering servo information in a disk drive for positioning a data transducer head relative to concentric data tracks wherein the head reads user data...
5418670 Magnetic recording medium having a servo pattern of the intermittent type with compensation for suppressing self-generated residual fields  
A magnetic recording medium has recorded thereon a series of discrete time-limited servo signal bursts. To suppress residual fields emanating from each servo signal burst, at least one half-cycle...
5404254 Method and apparatus for controlling head position  
Disclosed is a rotating memory device or disk drive which includes a rotating media having tracks thereon and an actuator arm which includes a head for writing representations of data to the track...
5388010 Peak detector for detecting accurate pulse peaks produced by a magnetic head exhibiting residual magnetism  
A peak detector for detecting accurate peaks of pulses recovered from a magnetic disk in the presence of residual magnetism by a magnetic head, but without the deleterious effects of such residual...
5384671 PRML sampled data channel synchronous servo detector  
A synchronous servo data detection subsystem for a PRML sampled data channel of a hard disk drive including a plurality of radially extending servo sectors embedded on a rotating data storage...
5383068 Head position recognition method, a speed calculation method, and a head movement speed control device  
A head position recognition method, a speed calculation method, and a head movement speed control device which provide for an overall improvement in storage device performance without increasing...
5381281 Disk drive system using multiple embedded quadrature servo fields  
A quadrature based embedded servo control system is provided to realize a high track density, high-performance hard disk drive system. Each data sector includes a gray code field spanning the...
5377178 Data recording/reproducing method and apparatus using a recording medium having clock marks recorded in a wobbled track for read/write synchronization  
A data recording/reproduction method and apparatus uses an optical disk equipped with wobbling track guide grooves disposed in a track scanning direction and minutely wobbled. The apparatus uses a...
5375020 Method and apparatus for writing or reading servo information  
A method and apparatus for writing and reading servo data placed on a plurality of disk surfaces to minimize the degree of overlap of headers written or read by each write/read channel. Time...
5373402 System and method for writing servo information and data to a plurality of magnetic discs  
A system for writing servo information to a plurality of magnetic discs in a servo write mode, and for writing data to the plurality of magnetic discs in a data write mode in disclosed. The system...
5369535 Fixed block architecture disk file with improved position identification and error handling  
A data recording disk file is provided with fixed block address head positioning information that is readable off-track with no increase in error rate. The positioning information includes both...
5362993 Weighted average servo burst peak detector for disk drive read  
A peak detector samples and holds amplitudes of pulses of a servo burst and includes a master peak detector for following a portion of a rising edge of each pulse until a peak amplitude is reached,...
5355486 System for allocating tasks between two actuators servicing the same magnetic disk media in a single disk drive  
A task assigning system within a dual actuator disk drive system wherein each task has a cylinder address comprising a plurality of registers, each register having a unique address and a plurality...
5345342 Disk drive using PRML synchronous sampling data detection and asynchronous detection of embedded sector servo  
A class IV partial response, maximum likelihood data channel for a disk drive includes an encoder connected to a data sequencer for converting user data blocks into a predetermined 8/9ths code such...
5343340 Digital servo signal demodulation method and apparatus utilizing a partial-response maximum-likelihood (PRML) channel in a disk file  
Apparatus and method are provided for servo signal demodulation using a servo processor and a partial-response maximum-likelihood (PRML) data channel in a disk file. A servo burst timing window is...
Matches 551 - 600 out of 762 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >