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7453660 Shock feed forward adaptive filters  
A disk drive device has a shock sensor that detects mechanical shocks to a disk drive device to provide a shock output signal representative of such mechanical shocks. The shock output signal may...
7453658 Recording control apparatus, recording and reproduction apparatus, and recording control method  
A recording control apparatus includes a waveform rectification section for receiving a digital signal generated from an analog signal representing information reproduced from an information...
7453361 Refurbishing and resale techniques for data storage tape  
Techniques are described for reselling and/or refurbishing data tape media. The techniques may involve determining life information associated with a data tape medium and reselling the data tape...
7450327 Coherent spin valve and related devices  
Embodiments of the present invention are directed toward the field of spintronics, and in particular, systems and devices capable of performing spin coherent quantum logic operations. The inventive...
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...
7446967 Method of measuring head characteristics of a data storage device, and data storage device  
Embodiments of the invention relate to measuring characteristics of a head with an actuator put in a state of being pushed against a crush stop. In one embodiment, with a head placed on an...
7446966 Method for precompensation/write-current latching to improve error rate  
A method is presented for writing data to a surface of a magnetic disk in a disk drive. The method includes determining a number of sector groups into which sectors of the data to be written will...
7440213 Apparatus and method for controlling remnant magnetization in a magnetic recording head  
The present invention provides a magnetic writer. The magnetic writer comprises a write circuit, a write pole, a first write coil for inducing a first magnetic field in the write pole by a first...
7440208 Flexible partial response targets for data detectors  
Automatically optimizing and programming features of a disk drive read channel for a selected partial response (PR) target. This enables flexible PR targets to be used in the read channel. The...
7439729 Integrated systems testing  
A hard disk drive system comprises N hard disk drive means for performing hard disk drive functions and is connected in a daisy chain, wherein N is greater than one. The system includes integrated...
7436620 Method for selecting an electrical power to be applied to a head-based flying height actuator  
A novel method of selecting an electrical power, to be applied to a subject head-based flying height actuator during operation of a disk drive, is disclosed and claimed. A touch-down power for each...
7436619 Head floating amount control method and unit, storage apparatus and computer-readable program  
A head floating amount control unit control a head floating amount of each of a plurality of heads respectively having a heater, with respect to a recording medium, by detecting contact between...
7436615 Using a measured error to determine coefficients to provide to an equalizer to use to equalize an input signal  
Provided are a read channel, storage drive and method using a measured error to determine coefficients to provide to an equalizer to use to equalize an input signal. A read channel is incorporated...
7436610 Disk drive employing different zone boundaries across disk surfaces  
A disk drive is disclosed comprising a plurality of disk surfaces, including first and second disk surfaces. A first physical zone on a first disk surface has a physical zone boundary at a first...
7433475 Electronic device, video camera apparatus, and control method therefor  
According to this invention, if noise generated by operation of a component such as a rotary drum of a recording/playback apparatus which operates periodically enters a microphone, noise waveforms...
7433288 Recording device and method, recording medium and program  
High bit-rate data and low bit-rate data for the same material are recorded in time division. Meanwhile, the recorded low bit-rate data is read out so as to be used for verification or time-shift...
7433140 Recording and playback apparatus, recording controlling method, and recording medium  
A recording and playback apparatus includes a recording and playback unit recording a signal on a storage medium and playing back the signal recorded on the storage medium, the recording and...
7430090 Storage apparatus, control method, control device, and program which preheats head  
Upon correction, a preheat sector number measurement unit measures a preheat sector number which corresponds to transition time from when electric power distribution to and heating of the heater by...
7430083 Virtual head fly profile measurement  
A method for monitoring a data storage medium is provided in which a virtual head fly profile is measured. In addition, a data storage device for implementing the monitoring method is provided.
7426086 Off track write protection for data storage device  
Embodiments of the invention prevent offtrack write that will be caused due to a head vibration in a storage device. In one embodiment, a hard disk drive (HDD) judges approval/disapproval of write...
7423832 Controlling head heating based on upcoming data sector write pattern  
A disk drive includes a rotatable data storage disk, a head, a heater element, and a controller. The disk includes a plurality of data sectors between servo spokes. The head is configured to fly on...
7423825 Disk unit and manufacturing method thereof  
A disk unit is capable of detecting a track, the track width of which deviates from a normal value, with high accuracy at high speed. A HDD includes a read head, a disk and defective-track...
7420759 Apparatus and method for internal calibration of normalized playback transfer curve in a hard disk drive  
Method calibrates an assembled hard disk drive for read head accessing rotating disk surface, by estimating non-linearity of that playback device based on two data patterns, which have a short...
7417815 Recording control apparatus, recording and reproduction apparatus, and recording control method  
A recording control apparatus includes a waveform rectification section for receiving a digital signal generated from an analog signal representing information reproduced from an information...
7417814 Magnetic recording device  
A magnetic recording device comprising a magnetic recording medium, a read-write channel for modulating write data, writing it on the magnetic recording medium, reading data from the magnetic...
7417813 Overlapping data track access  
A data recording apparatus includes a surface having a plurality of data tracks with leading track portions. A head moves along head paths over the data tracks to provide data access. The data...
7411754 System and method for measuring readback signal amplitude asymmetry in a perpendicular magnetic recording disk drive  
A method for operating a tester for testing heads and disks of a magnetic recording disk drive during manufacturing calculates the readback signal amplitude asymmetry in the frequency domain...
7411753 Method and apparatus for magnetization test of write head in a disk drive  
A disk drive of a perpendicular magnetic recording system has a magnetization test function, for testing the magnetized state of a write head. The disk drive is provided with a write driver and a...
7408735 Data tracking method and apparatus for disk-based data storage  
A method and apparatus for dealing with undesired deviations of servo burst component magnitudes, as compared with nominal magnitudes, is provided. Inaccurate servo burst magnitudes can arise from...
7405898 System and method for generating a position error signal (PES) reference curve in a data storage device  
System and method for generating a Position Error Signal (PES) reference curve in data storage devices are provided. The method includes scanning a distance of at least one Track Pitch (TP) in a...
7398590 Applying mechanical shock to a data storage device with an enclosed low-density gas  
The present invention relates to a method of manufacturing low-density gas-filled disk drives involving test equipment utilized to determine gas leaks occurring in disk drives subjected to shock...
7397623 Using a mechanical stop for determining an operating parameter of a data handling device  
Several readings of an actuator's location are taken with a given head while urging the actuator against a mechanical stop, which acts as a guide. These readings are useful, for example, for...
7394611 Circuits, systems, and methods for capacitive fly height measurement  
Circuitry, systems, and methods for measuring the fly height of a read/write head in a magnetic data storage system. The circuitry generally includes a capacitance measurement circuit configured to...
7391586 Servowriter ramp detection  
A detect control device is provided that monitors a position error signal signature associated with a transducer while being operably supported by an actuator at a substantially constant fly height...
7382566 Magnetic disk protection mechanism, computer system comprising protection mechanism, protection method for magnetic disk, and program for protection method  
A mechanical transport device includes a system for transport; and a hard disk drive attached to the system. The hard disk drive comprises a magnetic recording disk to record data, a head to read...
7382559 Recovery processing method for device specific information of medium storage device and medium storage device  
A medium storage device reads device specific information from a medium to a memory and performs read/write operation to the medium, which allows receiving commands from a host even if a read error...
7372651 Introducing a noise signal into a read-back signal when data is written to a removable data storage medium  
In one exemplary embodiment, a noise signal is introduced into a read-back signal when data is written to a removable data storage medium. While writing the data to the removable data storage...
7369341 Head flying height measuring apparatus in magnetic storage device  
Firstly, in order to check the noise level of a device, DC erasure is applied to a magnetic recording medium and the magnetic recording medium is read. Then, a test signal including a first order...
7369340 Disk drive detecting disk warping by detecting negative correlation between read signal amplitudes from top and bottom disk surfaces  
A disk drive is disclosed comprising a disk having top and bottom surfaces, and top and bottom heads actuated over the top and bottom surfaces, respectively. Control circuitry detects a warping of...
7369339 Failure prediction method for magnetic disk devices, and a magnetic disk device using the same  
A warning against the possible failure is accurately sent from the magnetic disk device to a host device. In one embodiment, error indices per unit time are stored discontinuously/continuously for...
7369338 Servo writer, and write and inspection method of servo signal  
A servo writer of the invention writes a servo signal in a magnetic tape, reads and inspects the signal, and has a servo writer main body and a plurality of unit panels changeably loaded to a panel...
7362538 Torque constant correction method in multiple sinusoidal seek servo and disk drive using the same  
A disk drive control method and apparatus. In particular, a torque constant correction method and apparatus in a disk drive using a multiple sinusoidal seek servo scheme. The torque constant...
7362529 Disk drive with variable density data tracks  
A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk...
7359139 Detecting fly height of a head over a storage medium  
A fly height control system comprises a measurement circuit that measures a first amplitude of a pulse, which is based on a predetermined pattern recorded on a storage medium, at a first...
7359134 Data save processing method for disk storage device and disk storage system  
A disk storage device has a plurality of disk faces and a plurality of heads. The disk storage device protects the data on the disk face for a head before the defect of the head occurs. For each...
7355803 Method and apparatus for optimizing hard disc drive and/or recording medium for the same  
A method and apparatus for optimizing a hard disc drive, in which parameters of the hard disc drive are updated by periodically performing a retry of the hard disc drive when the hard disc drive is...
7349174 Soft sensor for operating shock in a disc drive  
A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM)...
7349170 Method of monitoring operation of a disk drive by analyzing the envelope of a read-back signal in the frequency domain  
A method monitors operation of a disk drive. The method includes providing a disk drive which includes a rotating disk and a head having a read transducer in proximity to a surface of the disk and...
7345837 Disk drive that refreshes data on portions of a disk based on a number of write operations thereto  
A disk drive includes a rotatable data storage disk, a transducer, an actuator, and a controller. The transducer is configured to read and write data on the disk. The actuator is configured to...
7342741 Disk drive with variable track density  
A method of manufacturing a disk drive is disclosed in which servo information is written in tracks on a disk surface, the track width performance of the associated read/write transducer is...
Matches 1 - 50 out of 979 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >