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5341255 |
Disc drive head positioning servo system with coherent adjacent track magnetic patterns
A computer disc drive includes a disc with circumferentially arranged tracks, a number of sectors on each track, with each sector including positional and data fields. The disc drive also includes...
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5339207 |
Servo system for providing increased recording density and improved operation of the AGC circuitry
A servo system for use in a magnetic recording media is disclosed, with the system utilizing short and long address tracks in a predetermined pattern to increase the usable data storage space on...
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5325245 |
Method and apparatus for writing magnetic head positioning signal
In a magnetic disk apparatus, a head positioning signal is written on a magnetic disk, the written positioning signal is read out, the read positioning signal is demodulated to produce a position...
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5321560 |
Embedded servo system for low power disk drives
The servo field includes at least one sub-field of prerecorded information that simultaneously provides (i) data for a first servo function and (ii) data for at least one other servo function. In...
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5319508 |
Read circuit in magnetic disk drive
According to this invention, in a magnetic disk device for recording/reproducing data using a magnetic head, a position of which is controlled by a sector servo method, a tracking speed of an AGC...
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5317461 |
Magnetic disk apparatus having a circuit for detecting a position of servo information recorded on a target track
A magnetic disk apparatus detects servo information on a magnetic disk which includes a plurality of concentric tracks which are provided with an alternate arrangement of data areas and servo...
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5315451 |
Rotating storage track format emulation
A method of emulating an original record format for a new rotating storage device, including the steps of; (a) determining an original angular position (α) of a record according to a first...
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5315456 |
Programmable servo timing generator
A disk drive has a disk format that includes servo fields and interspersed data fields. The disk drive includes a timing generator for generating timing signals to synchronize and control operation...
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5311379 |
Method and system for positioning head on target cylinder of disk
A method of positioning a magnetic head on a target cylinder of a magnetic disk uses a position signal derived from a servo signal which is read from a magnetic disk using a magnetic head. The...
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5307218 |
Magnetic disk apparatus using both servo-surface servo and data-surface servo
A magnetic disk apparatus using a servo-surface servo and a data-surface servo is disclosed which comprises a servo disk which is disposed on a rotating axis and which has a servo surface on which...
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5307216 |
Sector identification method and apparatus for a direct access storage device
A method and apparatus are provided for digitally correcting sector pulse placement in a direct access storage device. A sector clock signal is generated equal to a sub-multiple clock rate of a...
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5305157 |
Read circuit providing two different reference levels for reading the servo sectors and data sectors of a rotating data storage disk
A hard disk drive is disclosed in which the disk has tracks each divided into alternating data sectors and servo sectors, with the control data such as track addresses on the servo sectors being...
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5305159 |
Magnetic disk apparatus
A disk system has a disk as a recording medium, and a disk recording/reproducing apparatus for recording and reproducing data by a head radially movable provided on a disk by a head moving...
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5301072 |
Sample data position error signal detection for digital sector servo
A sample data position error signal detection means is described. This invention is suited for use in a digital sector servo in a magnetic media disk drive environment. In particular, the invention...
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5295026 |
Magnetic disk drive
The present invention provides a magnetic disk drive for recording data on and reproducing recorded data from magnetic disk having a servocontrol data zone in which servocontrol data is stored. The...
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5293282 |
Multiple actuator disk drive
A multiple actuator disk drive utilizes multiple heads, associated with respective ones of multiple actuators, to read data from and write data to all tracks on the surface of a disk. The...
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5285327 |
Apparatus for controlling reading and writing in a disk drive
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...
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5278703 |
Embedded servo banded format for magnetic disks for use with a data processing system
A data processing system records information on magnetic disks in a format in which sector headers, which include embedded servo information, are radially aligned and recorded at a single frequency...
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5276564 |
Programmable start-of-sector pulse generator for a disk drive using embedded servo bursts and split data fields
A disk drive system employs uniform size data blocks, with each disk having a sectorized track format and each sector of a track including at least one servo burst. Data blocks exhibit a constant...
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5274510 |
Track address pattern for a disk memory apparatus
A track address pattern suitable for being applied to a magnetic disk apparatus which positions a head to a track with a desired address by a sector servo system, for example, wherein a gray code...
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5274509 |
On-the-fly splitting of disk data blocks using timed sampling of a data position indicator
A disk in a disk drive has radial spokes wherein servo bursts are recorded, and multiple concentric bands holding data blocks in pre-defined block frames. To maximize data density, the data rate in...
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5274511 |
Servo signal recording method and apparatus
An external position detector is mounted on a head arm that also carries a transducer for tracking a magnetic disk. When the head arm is moved at constant speed, the position detector produces an...
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5268800 |
Disk drive servosystem using gray code
A servosystem for controlling position of a magnetic head relative to a magnetic storage disk in a disk drive includes first and second feedback loops which provide head position error signals. The...
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5268803 |
Disc memory apparatus utilizing detection of high-accuracy address data in short servo sectors for high speed accessing
A disc memory apparatus allows its magnetic head to reach a target track in a short period of time, wherein address data is recorded on each two-track width corresponding to each of the...
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5255131 |
Asynchronous servo identification/address mark detection for PRML disk drive ssytem
Apparatus and method for asynchronous servo identification (SID)/address mark detection are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The SID/AM...
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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...
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5245594 |
Data read/write system for a disc storage unit
A disc storage unit includes discs having surfaces with concentric tracks for storing data in sectors. Each sector has identification information including a physical address designating a...
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5233486 |
Method for correcting track counting errors during seeks in a hard disc drive
A method for correcting track counting errors during seeks of a servo head across the surface of a rotating disc of a hard disc drive. The number of tracks remaining in the seek is maintained in a...
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5231550 |
Track access control system preventing unintentional delay in movement of head in non-adjusted disc device
A track access control system which is used in a rotating disc device, for positioning a servo head above a desired track by speed control and then position control. A timer starts when the head...
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5229895 |
Multi-track servo recording head assembly
This invention relates to a magnetic recording head assembly and method enabling an end user to record a unique servo control track on a magnetic recording tape while the tape is in the recorder to...
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5220546 |
Operating optical disk drives including calibrating a tracking error signal
An optical disk recorder has a fine actuator which holds an objective lens and which is movably mounted on a head carriage. Servo systems connected to the head carriage and the fine actuator cause...
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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...
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5210660 |
Sectored servo independent of data architecture
A data recording apparatus, such as a disk drive or tape drive is described wherein servo sectors written on a disk (or servo sections written on a tape) are equally spaced on a given track and...
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5208556 |
Phase lock loop for sector servo system
A phase lock loop for a sector servo system. A servo phase lock loop oscillator provides the control timing function of the servo. Initially, the PLO is locked in frequency to a frequency reference...
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5196970 |
Magnetic disc apparatus
A magnetic disc apparatus having at least one magnetic disc having a plurality of track groups thereon at different distances from the center of the disc each of which groups comprises plural data...
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5193034 |
Magnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic disk
A constant-density type of magnetic disk apparatus is made up of a plurality of magnetic disks, wherein at least one of the surfaces of the magnetic disks is a servo face divided into a plurality...
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5191568 |
Disc drive apparatus with tracking control based on multiple reference tracks and with automatic seek time adjustment
The present invention provides a disc drive apparatus having an improved tracking control and seek time adjustment. The head tracking error distribution along the disc radius is determined with...
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5187619 |
High speed switched automatic gain control
An automatic gain control circuit for controlling amplification of two independent input signals in which first and second attenuators are connected to receive the input signals and each attenuator...
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5182682 |
Sectored servo disk formatting
A sector on a disk contains position information used to determine position error of a transducer over the disk. The sector has a normal field with a first side and a second side. The first side is...
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5177651 |
Magnetic media and servo synchronization method
A flexible data disk has consecutive servo tracks having a synchronization and alternate synchronization mark. The synchronization and alternate synchronization marks in each servo sector are...
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5170299 |
Edge servo for disk drive head positioner
A method for determining the position of a data transducer head within one data track of a rotating data storage disk within a disk drive includes the steps of: providing at least one...
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5164866 |
Timing signal recording system of a magnetic disk apparatus
A timing control method and system for performing recording/reproducing operation using timing signals and servo signals prerecorded on a magnetic disk and a timing signal recording system for...
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5153788 |
Method of recording and detecting servo information for positioning magnetic head
Magnetization inversion data at different frequencies are recorded as part of servo information before and after an erasing gap between a data sector and a servo sector, the time interval between...
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5138511 |
Magnetic recording disk in which the level of the surface of the data tracks, and servo tracks is higher than that of the guardbands
A magnetic recording disk in which the level of the surface of the data tracks and servo tracks is higher than that of the guardbands.
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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...
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5132854 |
High speed seek sector servo magnetic disk drive unit
A disk drive unit is disclosed, which comprises a recording medium having more than two disk-shaped recording faces disposed on each other with an interval; information tracks disposed along the...
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5126895 |
Shockproof data transducer position control system for rotating disk data storage apparatus
A transducer position control system capable of shockproofing a hard disk data storage apparatus. Included is an off-track detector circuit relying on servo bursts prerecorded on the disk for...
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5115360 |
Embedded burst demodulation and tracking error generation
A disk drive comprising circular data tracks divided into sectors each of which includes a data field and a servo field containing embedded servo signals, an embedded signal sensor for sensing...
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5109307 |
Continuous-plus-embedded servo data position control system for magnetic disk device
A magnetic disk drive of the type in which a disk assembly has a dedicated servo surface containing circular tracks of dedicated servo signals and data surfaces containing circular data tracks...
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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...
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