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Browse by Category: Main > Information Technology
Class Information
Number: 360/77.03
Name: Dynamic magnetic information storage or retrieval > Automatic control of a recorder mechanism > Controlling the head > Track centering > Rotary carrier > By nonmagnetic sensing (e.g., optical, capacitive)
Description: Subject matter responsive to a signal produced in response to a property of the record carrier other than a magnetic property, or by a nonmagnetic auxiliary element.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8687943 Readout apparatus, readout method, and recording method Apr. 1, 2014
8456643 Method and system for mapping the shape of a head under operating conditions Jun. 4, 2013
8456976 Method and apparatus for centring a disk on a spindle Jun. 4, 2013
8437099 Hard disk drive and servo track writing system for the same May. 7, 2013
8437100 Flexure based shock and vibration sensor for head suspensions in hard disk drives May. 7, 2013
8182705 Method for producing thin film magnetic head having magnetoresistive effect element May. 22, 2012
8179629 Flexure based shock and vibration sensor for head suspensions in hard disk drives May. 15, 2012
8059518 Data storage apparatus, assembling method thereof and apparatus for generating tracking position error signal Nov. 15, 2011
8032007 Reading device, program, and reading method Oct. 4, 2011
7940490 Apparatus and method for improving bandwidth of a fine positioning mechanism data storage manufacturing and test equipment May. 10, 2011
7835106 Method of controlling the position of a read/write head and apparatus for testing a read/write head Nov. 16, 2010
7768738 Mitigating the effects of disturbances of a disk drive Aug. 3, 2010
7760461 Disk drive employing coarse position feedback from mechanical position sensor to improve format efficiency Jul. 20, 2010
7701661 Disk drive employing coarse position feedback from mechanical position sensor to improve format efficiency Apr. 20, 2010
7697234 Storage apparatus, control method, and control device which enable or disable compensation control Apr. 13, 2010
RE40975 Head suspension with resonance feedback transducer Nov. 17, 2009
7602577 Rapid off track detection using in-drive microactuator Oct. 13, 2009
7555947 Air pressure sensor Jul. 7, 2009
7529057 Servo loop employing correction vector from a secondary disturbance sensor to minimize correlation between servo loop error and disturbance sensor output May. 5, 2009
7495857 Servo writing a disk drive by writing spiral tracks using a mechanical position sensor Feb. 24, 2009
7480116 Disk drive employing coarse position feedback from mechanical position sensor to improve format efficiency Jan. 20, 2009
7468857 Acceleration feed-forward correction enabled or disabled based on track follow loop signals Dec. 23, 2008
7450335 Reducing read/write head track misregistration Nov. 11, 2008
7423833 Servo loop employing correction vector from a secondary disturbance sensor to minimize correlation between servo loop error and disturbance sensor output Sep. 9, 2008
7405896 Method and apparatus for detecting slider/disk fly-height modulation in a hard disk drive Jul. 29, 2008
7365932 Disk drive comprising an optical sensor for vibration mode compensation Apr. 29, 2008
7359138 Method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider Apr. 15, 2008
7321476 Method and system for determining contact potential in a hard disk drive Jan. 22, 2008
7277252 Method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider Oct. 2, 2007
7265931 Apparatus to reject disk drive disturbance Sep. 4, 2007
7256586 Method and device for measuring the repeatable and non-repeatable runout of rotating components of a spindle motor Aug. 14, 2007
7221528 Magnetic alignment marking of hard disks May. 22, 2007
7215500 Feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider May. 8, 2007
7215504 Disk drive using an optical sensor to detect a position of an actuator arm May. 8, 2007
7199960 Disk drive with AC exciter for head/disk interface Apr. 3, 2007
7193806 Feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider Mar. 20, 2007
7149047 Heating/cooling based system for obtaining a disc drive servo signal Dec. 12, 2006
7139152 Servo methods and systems using existing data structures and optical masks Nov. 21, 2006
7102845 Servo methods and systems using existing data structures and medium edge position Sep. 5, 2006
7088546 Method to reject disk drive disturbance Aug. 8, 2006
7082006 Compact optical tracking system for magnetic tape Jul. 25, 2006
7075746 Disk drives and disk drive containing devices that include a servo frequency generator and spindle control timer that compensate for disk eccentricity Jul. 11, 2006
7064913 Enhanced read margining using dither enhanced write marginalization for mass data storage applications Jun. 20, 2006
7054095 Displacement detection apparatus, and magnetic recording apparatus and encoder using the displacement detection apparatus May. 30, 2006
7050259 High precision servo track writing with position error signal feedback May. 23, 2006
7035034 Data storage device, control device, off-track control method, and control method Apr. 25, 2006
7035038 Magnetic disk unit Apr. 25, 2006
7012777 Disk drive with capacitance sensing of disk vibration and feedforward control for removal of read/write head track misregistration Mar. 14, 2006
7009791 Position detecting method, information recording/reproducing device and information recording medium Mar. 7, 2006
6977791 Media servowriting system Dec. 20, 2005

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