Patent application number | Description | Published |
20090027803 | High Areal Density Tape Head - A tape head designed for transducing data on a magnetic recording tape that is subject to tape dimensional changes. The tape head includes two or more arrays of transducer elements having different transducer spacing distances corresponding to different track spacing distances to be transduced. One of the transducer arrays may be used for transducing the tape under nominal tape track spacing conditions. Another transducer array may be used for transducing the tape when the tape track spacing is reduced due to the tape shrinkage. Still another transducer array may be used for transducing the tape when the tape track spacing is enlarged due to tape expansion. | 01-29-2009 |
20110108626 | ELECTRONIC CARD AND METHOD FOR GENERATING A MAGNETIC FIELD FROM SWIPING THE ELECTRONIC CARD THROUGH A CARD READER - An electronic card and a method for processing data stored in the electronic card. The electronic card includes a memory containing data to be read by a card reader. The electronic card may include a programmable field source containing wire structures geometrically configured and energized in a manner that drives an electric current through only two wire structures at a time for generating a time varying magnetic field that induces a readback signal in the card reader as the electronic card is being swiped through the card reader. An electrical current in at least one wire in the electronic card generates a time varying magnetic field and may include a finite time derivative of electrical current whose magnitude does not exceed a specified maximum time derivative of electrical current corresponding to a peak voltage threshold (V | 05-12-2011 |
20110109988 | SYSTEMS AND METHODS FOR COMPENSATING FOR CROSSTALK BETWEEN NEARBY WRITERS - A recording system controller according to one embodiment includes a controller capable of selecting a level of a current or voltage applied to a first writer during the creation of a magnetic transition based on a current in at least one nearby writer. A recording system controller according to another embodiment includes a controller capable of selecting a timing of a current change applied to a first writer based on a current in at least one nearby writer for compensating for an effect of crosstalk from the at least one nearby writer. A method according to yet another embodiment includes selecting a level of a current or voltage applied to a first writer or selecting a timing of a current change applied to the first writer based on a current in at least one nearby writer for compensating for an effect of crosstalk from the at least one nearby writer. | 05-12-2011 |
20110122527 | Storing and Locating a Self-Describing Storage Cartridge - Embodiments of the invention relate to storing and locating a self-describing storage cartridge. An aspect of the invention includes a system for storing and locating a self-describing storage cartridge. The system includes a storage cartridge. The storage cartridge includes a first storage module configured to store data objects. The storage cartridge further includes a second storage module configured to store an index describing the data objects stored on the first storage module. The storage cartridge further includes a connector coupled to the second storage module and configured to provide an external device with access to the second storage module. | 05-26-2011 |
20110238905 | PRIMARY STORAGE MEDIA WITH ASSOCIATED SECONDARY STORAGE MEDIA FOR EFFICIENT DATA MANAGEMENT - A system according to one embodiment includes a tape cartridge, the tape cartridge comprising: a housing; a magnetic recording tape in the housing; and a non-tape nonvolatile memory coupled to the housing, the nonvolatile memory being for storing therein an index comprising file system information for a plurality of files stored on the magnetic recording tape. A method for storing data on a tape cartridge according to one embodiment includes writing a plurality of files to a magnetic recording tape of a tape cartridge; and writing an index to a non-tape nonvolatile memory of the tape cartridge, the index including information about locations of data of the plurality of files on the magnetic recording tape. | 09-29-2011 |
20120019954 | METHOD AND APPARATUS FOR BIPOLAR SERVO MARKS WRITING WITH HIGH OUTPUT - A method and apparatus for bipolar servo marks writing with high output. The method includes providing a servo write head having first and second write gaps; and applying a varying current comprising either (i) abrupt changes in current in combination with current ramps or (ii) patterns of high-frequency current pulses before and after writing servo marks to a medium proximate to and moving past the first and second write gaps. The apparatus includes a bipolar servo write driver configured to generate a varying bipolar current signal having both negative and positive polarity currents and a servo write head having a first write gap and second write gap spaced apart, the varying current signal comprising either (i) abrupt changes in current in combination with current ramps or (ii) patterns of high-frequency current pulses before and after low-frequency pulses and a component to move a medium proximate to and past the first and second write gaps. | 01-26-2012 |
20120094852 | MAGNETIC NANOPARTICLE DETECTION ACROSS A MEMBRANE - Magnetic nanoparticles are detected across a thin membrane that separates the nanoparticles from a magnetic sensor. The technique can be used in a medical context, in which an analyte of interest (present in a test fluid, such as blood) is attached to the membrane. Other compounds are in turn bound to the analyte, with one of these compounds including a magnetic nanoparticle that is then detected by the sensor. In this way, the analyte is detected by detecting the magnetic nanoparticle. By counting the number of magnetic nanoparticles, the concentration of the analyte in the test fluid can be determined. | 04-19-2012 |
20150015246 | CALIBRATING READ SENSORS OF ELECTROMAGNETIC READ-WRITE HEADS - Described are embodiments to calibrate read sensors, which in turn may ensure that the equipment utilized to detect antigens is reliable and accurate. If it is determined that a read sensor is degraded a method of calibrating a read sensor of a read head may be used. | 01-15-2015 |
20150070797 | MAGNETIC TAPE MEDIA HAVING SERVO PATTERNS - Magnetic tape media according to one embodiment includes a servo track having a plurality of servo marks therealong. A distance of the servo marks, as originally written, from an edge of the tape media varies along the length of the magnetic tape media. Magnetic tape media according to another embodiment includes a plurality of servo tracks having physical characteristics of being written by an apparatus that monitors a lateral position of the magnetic tape media passing over a servo writing head during a servo track writing operation and writes servo marks to the magnetic tape media. A timing of the writing of each servo mark is based on the monitored position of the magnetic tape media. | 03-12-2015 |