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7616395 |
Information reproduction apparatus
There is provided an information reproduction apparatus that can suppress degradations in the qualities of reproduced data and timing from due to interpolation errors when performing interpolation...
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7609469 |
Alternative sensors for tracking and timing in bit patterned media
An apparatus includes a bit patterned magnetic storage media, a write transducer positioned adjacent to the bit patterned magnetic storage media, a write driver coupled to the write transducer to...
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7609468 |
Method and system for read gate timing control for storage controllers
A disk controller that controls data transfer between a storage device and a host system is provided. The disk controller includes logic having a state machine that controls de-assertion of a read...
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7602568 |
Synchronous RRO write
A hard disk drive system includes a control module that generates a phase offset signal for a repeatable run out (RRO) field of a servo wedge based on an RRO phase of the RRO field and a data phase...
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7599140 |
Output control device and recording-medium-driver control device
A determining unit determines whether a clock signal is oscillated with an oscillation amplitude equal to or greater than a predetermined value. An output control unit outputs the clock signal to...
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7586707 |
Magnetic disk drive with increased storage capacity
Embodiments of the invention provide a magnetic disk drive capable of reducing an area used for a preamble of each data sector to increase the storage capacity. The magnetic disk drive adopts a...
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7583460 |
Edge controlled fast data pattern generator
Fast data patterns with desired edge positions are provided. A pattern generator (PG) circuit 10 stores and provides data patterns and respective position control data. A delay circuit 16 ...
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7583459 |
Method and apparatus for write precompensation in a magnetic recording system
A phase interpolator is provided that, in one implementation, includes an output node, a plurality of phase input circuits, and a plurality of switches corresponding to the plurality of phase input...
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7583458 |
Channel optimization metrics
A recording system, such as a magnetic or optical recording system, employs optimization metrics that are independent of a target partial response for equalization of a signal read from a recording...
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7580213 |
Apparatus and method to minimize amplitude variations associated with media/head response characteristics in servo writing of perpendicular magnetic recording
A servo writer that writes servo information onto a disk of a hard disk drive. The writing of the servo can be synchronized by a clock track that contains a clock read back signal. The clock read...
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7573664 |
Integrated multiple channel data reliability testing for a magnetic tape drive
Data reliability testing for a magnetic tape drive is conducted separately for the channels of a magnetic tape drive which write and read tracks of a multiple track magnetic tape. Memory stores...
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7570446 |
Disk drive with improved format efficiency and control method thereof
Embodiments of the invention provide a magnetic disk drive and its control method capable of effectively using the unrecordable area which is caused due to the composite magnetic head's gap between...
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7567140 |
Voltage controlled oscillator having a bandwidth adjusted amplitude control loop
An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate an output signal oscillating at a frequency in response to a first control signal and a...
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7564931 |
Robust maximum-likelihood based timing recovery
A method of timing recovery comprises receiving an input signal, sampling the input signal to produce a plurality of signal samples, detecting the samples to produce an output signal, and...
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7561649 |
Method and apparatus for synchronization mark detection with DC compensation
A method and apparatus are disclosed for detecting a synchronization mark in a received signal. The received signal is processed to compensate for a DC bias in the received signal, such as...
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7561361 |
Dynamic synchronization of timing signals
A synchronization system includes a signal generating module that generates a signal comprising modulated waveforms and a timing window generator that generates a timing window. A proportional...
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7551390 |
Disk drive to characterize misaligned servo wedges
Disclosed is a disk drive and method to characterize misaligned servo wedges. The disk drive includes an actuator arm, a head, a disk, and a servo controller. The head is connected to a distal end...
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7551387 |
Servo writing with offset compensation for prewritten reference
In accordance with various embodiments, a rotatable member is mounted to a spindle hub so that initial servo data previously provided to the rotatable member are eccentrically offset with respect...
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7551383 |
Adjusting voltage delivered to disk drive circuitry based on a selected zone
A disk drive includes a disk comprising a plurality of zones, a clock for generating a timing signal having a timing frequency, a voltage controller for providing a supply voltage, and circuitry...
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7551379 |
Write element before read element with early servo termination on write
Embodiments of the present invention provide a magnetic disk drive system in which the write element leads the read element in the tangential direction of rotation of the magnetic disk. In...
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7538962 |
Media event timer and methods for use therewith
A media event timer includes a counter module for generating a sequence of counts based on a clock signal of a disk drive unit. A counter reset module sets the counter module to a reset count in...
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7532424 |
Method of writing pattern on media and data storage device
Embodiments of the invention reduce the effect of the rotational jitters to write a pattern in more accurate timing in self-writing a pattern on a magnetic disk. In an embodiment of the invention,...
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7529052 |
Disk controller and methods for use therewith
A disk controller includes a write signal generator for generating a write gate signal based on a media event trigger. A read signal generator generates a read gate signal based on the media event...
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7529051 |
Compensation for variation in timing skew in a disc drive data storage system
An apparatus and method for compensation for variation in timing skew in a disc drive having at least one rotating disc is provided. A first head is positioned over a first disc surface and a...
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7522372 |
Servo track having periodic frames of tone field and embedded synchronization marks
Methods and systems for sensing a position of a transducer head with respect to a storage medium. One method includes generating a read signal from a servo track stored on a magnetic storage...
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7522369 |
Circuits, architectures, apparatus, systems, and methods for maintaining constant spacing in a read/write apparatus for data storage
Circuits, architectures, a system and methods for adjusting spacing between a data writing mechanism and a data storage medium. The circuit generally includes (a) adjustment logic configured to (i)...
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7522364 |
Control circuit for information storage device
To reduce power consumption of an information storage device, a control circuit for the information storage device stops the supply of a formatter clock or an ECC unit clock simultaneously with a...
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7522363 |
Medium storage device and medium rotation synchronization processing method for medium storage device
A medium storage device writes or read data on a storage medium synchronizing the rotation of the storage medium with the DSW method for decreasing the gap length considering the rotation jitter....
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7515369 |
Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery
A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head...
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7515368 |
Precompensation circuit for magnetic recording
A pre-compensation circuit comprises a clock delay generator that generates clock delay data based on a clock signal having a first clock rate. A reference clock delay unit receives the clock...
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7511909 |
Sector based timing recovery for a readback signal
A method and a signal processing unit are proposed, for converting an asynchronous discrete-time signal to a synchronous discrete-time signal by performing sector-based timing recovery. The timing...
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7511582 |
Voltage controlled oscillator for use in phase locked loop
The present invention provides a clock circuit to produce a Reference Clock Signal used to latch data between first bit stream(s) and second bit stream(s), wherein the number and bit rate of the...
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7508611 |
Disk drive clock circuit that adjusts clock edge timing in response to servo information and methods thereof
A disk drive clock circuit includes a servo clock generator and a disk locked frequency converter. The servo clock generator generates a servo clock signal in response to servo information read...
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7502187 |
Address mark detection
A recording system, such as a magnetic or optical recording system, employs an address mark (AM) detector that searches for an address mark pattern that is augmented by one or more bits of a...
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7502186 |
Disk drive clock tracking circuit, error compensation circuit and method
A clock tracking circuit and method uses a clock compensation signal to compensate for timing marks on a media disk. The clock compensation signal may compensate for at least one of improper clock...
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7502185 |
Method and system for determining spin pad length
Method and system for determining spin pad length in a data storage system. The data storage system has a data storage medium having at least one track for storing a plurality of data sections, a...
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7499238 |
Systems and methods for improving disk drive synchronization
Various systems and methods for providing head location feedback are disclosed herein. For example, one system includes an interface circuit that is operable to receive an information stream...
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7499237 |
Recording controlling method in hard disk drive and hard disk drive using the same
A method of controlling recording and a hard disk drive (HDD) using the same. The HDD has heads in which a write head and a read head are spaced apart from each other by a predetermined gap in a...
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7495855 |
Apparatus and method for reading and writing data in recording medium
In a medium recording playback apparatus, a write linking position judging unit judges whether a servo frame for reading/writing data is in a servo write linking position. If the servo frame is not...
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7492545 |
Method and system for automatic time base adjustment for disk drive servo controllers
A system and method for a servo controller (SC) used in an embedded disk controller for adjusting stored servo skew values based on measured skew values is provided. The system includes, a servo...
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7492540 |
Apparatus system and method for variable data density patterned media
An apparatus, system, and method are disclosed for variable data density patterned media. The apparatus includes a patterned media recording surface comprising a plurality of sectors. Each sector...
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7489463 |
Method of writing patterns using head with correct phases, and data storage device
Embodiments of the invention relate to writing servo patterns onto a recording disk with a high degree of accuracy and with correct phases in a servo-pattern-writing process. An In-Drive SSW (TSSW)...
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7489203 |
Noise tolerant phase locked loop
An apparatus and method for providing timing recovery under conditions of low signal to noise ratios (SNRs) is disclosed herein. A preliminary phase error signal is generated by comparing an input...
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7486461 |
Magnetic disk device and read/write method
Embodiments of the invention eliminate the unnecessary disk format margin to raise the format efficiency. In one embodiment, a disk control unit (MPU) predicts the variation of the next servo...
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7483235 |
Position detecting circuit, information recording apparatus, and magnetic disk device
The delay time from the rotation start of a magnetic disk medium (M) to a servo pattern being read is obtained with respect to a radial position from the phase delay that the trajectory of a...
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7474487 |
Read/write timing generator and methods for use therewith
A read/write timing generator includes a read/write signal generator for generating a read/write signal in response to the media event trigger of a disk drive and synchronized to a read/write bit...
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7471481 |
Method for establishing and maintaining radial position for hard disk drive self servo write without seed wedges
Magnetic reference patterns may be generated on a disk or other magnetic media without the need for seed wedges. This involves writing a first magnetic reference pattern to the disk with a servo...
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7468855 |
Servo writing a disk drive from a number of spiral tracks equal to a non-integer multiple of product servo wedges
A method is disclosed of writing product servo sectors to a disk of a disk drive to define a plurality of product servo wedges, the disk comprising a plurality of spiral tracks. The spiral tracks...
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7466782 |
Methods, apparatus and computer program products for determining the timing of bits based on frequency error
Determining timing for bits in sampled data includes determining a bit error in the sampled data, determining a phase error in the sampled data, determining a frequency error of the sampled data...
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7457074 |
Method and apparatus for correcting errors while writing spiral servo information in a disk drive
According to one embodiment, a servo information writing method for use in a disk drive, for recording the servo information, forming a continuous servo track such as a spiral track. In this servo...
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