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7450326 Method to determine temperature dependent write pre-compensation in a hard disk drive  
Methods in accordance with the present invention can include determining a plurality of sets of write pre-compensation parameters. At baseline conditions, the hard disk drive can apply a first...
7446968 Method for using a minimum latency loop for a synchronization system in a hard disk drive  
The method and architecture improve the robustness of a synchronization system through a minimum latency loop, for Hard Disk Drives (HDD), for example, wherein synchronous detection processing is...
7446685 Read signal processing circuit, read signal processing method, and optical disc drive  
The present invention provides a read channel and a drive capable of suppressing deterioration in performance of a PLL and a Viterbi decoder by using a DC component eliminating means capable of...
7443626 Patterned disk medium for vertical magnetic recording, and magnetic disk drive with the medium  
A patterned disk medium includes a disk-shaped flat substrate including a first surface and a second surface located an opposite side of the first surface. First servo pattern areas including...
7440211 Apparatus and/or method of controlling timing of servo pulses and disk drive using the method  
Provided is a method and apparatus for adaptively controlling the timing of servo pulses in a disk drive in consideration of the amount of spindle jitter generated when a disk rotation speed is...
7440210 Servo writing a disk drive by writing multi-bit sync marks in spiral tracks for improved servo writing  
A method of writing spiral tracks on a disk of a disk drive is disclosed. The disk drive comprises control circuitry and a head disk assembly (HDA) comprising the disk, an actuator arm, a head...
7436612 Storage apparatus, storage apparatus control method, and computer product  
A calculating unit calculates an interval time from a detection of a servo sync mark until a detection of an adjacent servo sync mark, for all servo sync marks on a track of a disk-shaped recording...
7433143 Adjusting track density by changing slope of spiral tracks used to servo write a disk drive  
A method and apparatus is disclosed for adjusting the track density by changing the slope of spiral tracks used to servo write a disk drive. A target track density is established for a disk...
7433142 Using at least one servo channel to provide timing recovery and timing information to data channels  
Provided is a read channel, storage drive, and method to process signals read from a storage medium. At least one data channel including an interpolator and equalizer and a servo channel includes...
7430085 Disk device and method of generating signal representing head  
A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ...
7428117 Servo signal inspecting device and method for inspecting servo signal  
A servo signal inspection device and a method for detecting servo signal are provided which can measure and evaluate quality of the servo signal on a magnetic tape with a sufficient resolution. The...
7423827 Systems and methods for accessing data from a variable polarity head assembly  
Various systems and methods for accessing data via a variable polarity head assembly are disclosed herein. As one example, a method for accessing data is disclosed that includes receiving a data...
7421021 Adaptive signal equalizer with adaptive error timing and precursor/postcursor configuration control  
An adaptive signal equalizer with a feedforward filter in which the feedback error signal and corresponding incoming data signal are dynamically aligned in time using signal interpolation, and...
7411758 Disk drive servo control using spirals  
A servo control system includes a peak detection module that detects peak times of spiral signals generated by reading spirals prewritten on a magnetic medium. The servo control system includes a...
7405894 Frequency, phase, and gain estimation technique for use in a read channel receiver of a hard disk drive  
One or more methods and systems are presented for performing gain and timing acquisition of data read from one or more data sectors of a hard disk drive. The gain and timing information may be used...
7400464 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...
7400205 Frequency synthesizer and oscillation control method of frequency synthesizer  
The present invention provides a frequency synthesizer capable of switching an oscillation frequency band while maintaining a lock state realized with a small-scale and low-current-consumption...
7397621 Servo pattern characterization on magnetic disks  
In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected...
7397313 Auto-gain controlled digital phase-locked loop and method thereof  
A digital PLL system includes a first multiplier coupled to a phase difference signal for multiplying the phase difference signal by a first gain factor; a second multiplier coupled to the phase...
7394608 Read channel apparatus for asynchronous sampling and synchronous equalization  
A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by...
7391584 Compensating for repeatable phase error when servo writing a disk drive from spiral tracks  
A method of servo writing 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 interrupted periodically...
7391583 Fault tolerant sync mark detection while servo writing a disk drive from spiral tracks  
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...
7388938 Method for bit-byte synchronization in sampling a data string  
Bit and byte synchronization for sampling and decoding a data string is provided a single data field u. The data string x has pre-pended to it a short string of 1s (ones), followed by u to yield a...
7382568 Circuit and method for detecting a servo wedge on spin-up of a data-storage disk  
A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. The processor detects...
7382564 Acquiring spiral servo information on a storage surface  
Various embodiments of the present invention are generally directed to processing servo data on a storage surface by detecting a time difference between consecutive read signal envelopes from...
7379452 Synchronous read channel  
A synchronous read channel having a single chip integrated circuit digital portion which provides digital gain control, timing recovery, equalization, digital peak detection, sequence detection,...
7372650 Rotating media storage device having a calibration track with unique calibration servo synch marks  
Disclosed is a rotating media storage device (RMSD) that has at least one calibration track with unique calibration servo synch marks (SSM c s). The RMSD includes a disk that comprises a plurality...
7365671 Communication channel with undersampled interpolative timing recovery  
Method and apparatus for processing transmitted data. A sampling circuit preferably performs lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a...
7362957 Reproducing apparatus  
A reproducing apparatus, in which a reproduced information signal is equalized by an equalizer, includes a detecting circuit for detecting a digital signal from the reproduced information signal,...
7362525 PRML based magnetic servo position demodulator  
Apparatuses and methods for detecting reference marks on magnetic data storage mediums are described herein. In one variation, the apparatus comprises a magnetic servo position demodulator operable...
7359135 Dynamically adapting a magnetic tape read channel equalizer  
A read channel equalizer of a magnetic tape drive which equalizes digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic...
7349167 Utilizing track identification fields for timing recovery  
An apparatus comprises a data storage medium having a plurality of servo sectors and a plurality of data sectors, wherein each of the servo sectors includes a phase locked loop field and a track...
7345839 Signal processing in a disc drive  
A disc drive system, such as a magnetic or optical recording and/or playback system, for low-data rate applications implements one or more circuit operations, such as read signal detection and...
7342735 Method of writing patterns onto a recording disk, and data storage device  
Embodiments of the invention relate to writing servo patterns having aligned phases onto a recording disk in a process to write the servo patterns onto the disk. In one embodiment, time aligned...
7336435 Method and system for collecting servo field data from programmable devices in embedded disk controllers  
A servo controller for an embedded disk controller comprises a read channel interface that includes a programmable control logic that receives a servo field detected signal from a module that...
7333280 Servo writing a disk drive by synchronizing a servo write clock to a reference pattern on the disk and compensating for repeatable phase error  
A method of writing product servo sectors on a disk of a disk drive is disclosed. The disk comprises a reference pattern having a plurality of sync marks written around the disk. The sync marks are...
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...
7330321 Reference magnetic signal recording device and method of manufacturing the same  
A method of simultaneously recording multiple reference magnetic signals by using a magnetic head having multiple recording portions is provided. A writing yoke formed of a ferromagnetic material...
7324295 Method of detecting position of head in recording medium drive  
The difference is detected between the outputs from first and second heads in a recording medium drive. The first head is positioned relative to the boundary between a first recording track and a...
7324294 Magnetic recording disk drive with patterned media and circuit for generating timing pulses from the pattern  
A magnetic recording disk drive has a patterned magnetic recording disk with data blocks of magnetizable material separated by nonmagnetic regions, a read head for reading the magnetized data...
7310283 Apparatus and method for controlling clock signal in semiconductor memory device  
An operation clock controller for preventing a semiconductor memory device from operating when an operation frequency of an external clock is higher than a predetermined frequency. The operation...
7304545 High latency timing circuit  
A phase locked loop (PLL) circuit, comprises a frequency integrator circuit that receives a target signal, a phase shift signal and a frequency gain correction parameter and that selectively...
7301717 Servo writing a disk drive by integrating a spiral track read signal  
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...
7286597 Methods and systems for adaptive receiver equalization  
Methods and systems for minimizing distortions in an analog data signal include equalizing the analog data signal at a receive end. In an embodiment, the invention adapts equalization parameters to...
7286313 Correcting radial incoherence in servo track sensing  
A servo track sensing system receives equalized servo data from a servo demodulator and corrects for radial incoherence in the servo data. The system has a radial incoherence estimator that...
7280295 Method to improve data reliability on hard disk drive systems  
A method for storing user data on a hard disk drive system comprises distributing user data across a plurality of independent data sectors, with each data sector including a first header having a...
7271971 Dynamically adapting a magnetic tape read channel equalizer  
A read channel equalizer of a magnetic tape drive which equalizes digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic...
7271969 Apparatus for providing high speed, linear-phase interpolation  
A method and apparatus for providing high speed, linear-phase interpolation. Signals from a plurality of differential pairs are weighted to produce an output clock having a selectable linear phase...
7268963 Self-servo-writing multi-slot timing pattern  
Self-servo-writing of multi-slot timing patterns is described. Individual timing marks are replaced with groups of timing mark slots. At each timing mark location, a time measurement is made by...
RE39807 Phase locked loop circuit  
A PLL circuit comprises a frequency comparator for detecting a phase difference based on a difference in frequencies between a reproduced data pulse and a clock generated by a VCO; a phase...
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