| Patents for G11B 21 - Head arrangements not specific to the method of recording or reproducing (20,963) |
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| 05/24/1989 | EP0316566A2 Method for the acquisition of a control signal for automatic track following |
| 05/23/1989 | US4833557 Transducer shifting device |
| 05/23/1989 | US4833556 Low drag stabilizer device for stabilizing the interface between a transducer and a moving medium |
| 05/23/1989 | US4833551 Dual head servo system and method for a magnetic disk |
| 05/23/1989 | US4833550 Magnetic disk device having a mechanism for removing an adhesion between a magnetic head and a magnetic disk |
| 05/16/1989 | US4831615 Dual differential optical system moving apparatus |
| 05/16/1989 | US4831614 Direct access storage unit using tunneling current techniques |
| 05/16/1989 | US4831612 Optical disc reading apparatus |
| 05/16/1989 | US4831480 Liquid crystal polyester |
| 05/16/1989 | US4831471 System for positioning a magnetic head at a center line of a floppy disk track |
| 05/16/1989 | US4831470 Method and apparatus for recording disk servo information with detachable position decoder |
| 05/16/1989 | US4831469 Disk drive head retract and motor braking method and apparatus |
| 05/16/1989 | US4831315 Transducer positioning apparatus with multiple modes of motion |
| 05/10/1989 | EP0315419A2 Encapsulated stepper motor |
| 05/09/1989 | US4829502 Automatic loading disc player |
| 05/09/1989 | US4829396 Magnetic disc apparatus for deflecting magnetic heads from contact with the recording disc surface |
| 05/09/1989 | CA1253961A1 Expandable suspension for supporting a slider and moving it to the disk in a data recording disk file |
| 05/05/1989 | WO1989004040A1 Servo pattern |
| 05/03/1989 | EP0314515A2 Disc drive incorporating automatic wear compensation for a pivoted arm |
| 05/03/1989 | EP0314111A2 Storage apparatus including head drive control |
| 05/02/1989 | US4827464 Slider servo device |
| 05/02/1989 | US4827365 Assembly for accessing information recording medium |
| 05/02/1989 | US4827362 Magnetic disk device having compensation for dimensional change |
| 05/02/1989 | US4827202 Method of and circuitry for automatically adjusting the variable-gain amplification in a control loop |
| 05/02/1989 | US4827200 Velocity control unit of detecting head |
| 04/26/1989 | EP0313136A1 Apparatus for recording and/or reading recording tracks in a recording surface of a disc by means of a scanning unit, which disc rotates about an axis of rotation during operation |
| 04/26/1989 | EP0312644A1 Head tracking system |
| 04/26/1989 | CN1032600A Data storage apparatus |
| 04/26/1989 | CN1004036B Driving device for disk drive |
| 04/25/1989 | US4825432 Frictionless moving device for an optical recording system in a high density spiral track-forming apparatus capable of resisting disturbing forces |
| 04/25/1989 | US4825431 Disc reproducing apparatus |
| 04/25/1989 | US4825316 Thermal deformation controlled enclosure for a disk drive system |
| 04/25/1989 | US4825313 Method for adjustably positioning a transducer for a disc drive |
| 04/25/1989 | US4825310 Method and apparatus for recording servo synchronization information |
| 04/25/1989 | US4825302 Video recording camera |
| 04/19/1989 | EP0312410A2 Data reading device for use in a disc player |
| 04/19/1989 | EP0312153A2 Playback apparatus for disc-shaped record carrier |
| 04/19/1989 | EP0311859A2 Data storage apparatus |
| 04/18/1989 | US4823336 Optical disk drive |
| 04/18/1989 | US4823219 Carriage recording head sandwiched by electromagnetic coil sections |
| 04/18/1989 | US4823212 Sampled servo code format and system for a disc drive |
| 04/18/1989 | US4823205 Capacitive sensor for head positioning in magnetic recording disk files |
| 04/13/1989 | DE3733437A1 Device for converting a rotary to a translational motion |
| 04/13/1989 | DE3732996A1 Apparatus for reproducing data |
| 04/11/1989 | US4821252 Information recording and/or reproducing apparatus |
| 04/05/1989 | EP0310119A2 Method for positioning a magnetic head and magnetic disk driving apparatus for implementing the method |
| 04/05/1989 | EP0309704A1 Data reproduction device |
| 04/04/1989 | US4819109 Slidable carriage mount for disc memory apparatus |
| 04/04/1989 | US4819106 Head positioning assembly for magnetic disc apparatus |
| 04/04/1989 | US4819094 Damped magnetic head suspension assembly |
| 04/04/1989 | CA1252204A1 Positionable transducer mounting structure |
| 03/29/1989 | EP0308537A1 Sensor for converting a distance to optical and further to electrical energy, and surface scanning apparatus using same |
| 03/29/1989 | EP0308527A1 Air bearing slider rail design and mechanical method for producing it |
| 03/28/1989 | US4817077 Devices for detecting defects of disc-shaped record media |
| 03/28/1989 | US4817073 Tracking servo system for an information recording disc player |
| 03/28/1989 | US4816942 Spring powered transducer retractor mechanism for data transfer apparatus |
| 03/28/1989 | US4816941 Disk file digital servo control system with optimized sampling rate |
| 03/28/1989 | US4816938 Process for determining data disk track centers |
| 03/23/1989 | WO1989002644A1 Least squares method and apparatus for determining track eccentricity of a disk |
| 03/22/1989 | EP0308254A2 Magnetic disk memory |
| 03/22/1989 | EP0308070A2 A data recording disk file with digital servo control |
| 03/22/1989 | EP0308069A2 A data recording disk file with digital servo control |
| 03/22/1989 | EP0308062A2 Disk file digital servo control |
| 03/22/1989 | EP0307982A1 Apparatus for reading an optically readable record carrier |
| 03/22/1989 | EP0307586A1 An improved automatic head position tracking servo for a rotary head magnetic tape recording and reproducing apparatus |
| 03/21/1989 | US4814916 Magnetic disc memory device |
| 03/21/1989 | US4814909 Data transducer position control system for rotating disk data storage equipment |
| 03/21/1989 | US4814907 Method and apparatus for maintaining constant flying height via magnetic interaction |
| 03/21/1989 | US4814906 Magnetic head slider |
| 03/21/1989 | US4814902 Apparatus for recording and/or reproducing with video and multiple audio rotary heads |
| 03/21/1989 | US4813782 Method and apparatus for measuring the floating amount of the magnetic head |
| 03/15/1989 | EP0307211A2 Memory reading device |
| 03/15/1989 | EP0307210A2 Memory writing apparatus |
| 03/15/1989 | EP0307202A2 High-speed search method for use in a disc player system |
| 03/15/1989 | EP0307130A2 Position control method for movable member and apparatus therefor |
| 03/15/1989 | CN1003617B Tracking control device for recording and/or reproducing signal |
| 03/14/1989 | US4812934 Actuator for memory storage device |
| 03/14/1989 | US4812933 Magnetic disc recording and reproducing device |
| 03/14/1989 | US4812928 Stepper motor data recovery method using a magnetic hysteresis based stepping algorithm |
| 03/08/1989 | EP0306128A2 Disk player and scanning method therefor |
| 03/08/1989 | EP0305722A1 An improved automatic head position tracking servo for a rotary head magnetic tape recording and reproducing apparatus |
| 03/08/1989 | EP0305498A1 Crash-prevention for disk drive positioning system. |
| 03/08/1989 | EP0305474A1 Voice coil linear actuator. |
| 03/07/1989 | US4811316 Apparatus for seeking a track of an optical information carrier in which a loss of detection signal is compensated for |
| 03/07/1989 | US4811315 Disc player with program selection control |
| 03/07/1989 | US4811145 Head device of tape player |
| 03/07/1989 | US4811144 Magnetic recording head motion translation apparatus for head/media evaluation systems |
| 03/07/1989 | US4811139 Device for recording and reproduction having head moving means |
| 03/07/1989 | US4811135 Tri-phase servo pattern for providing information for positioning the transducers of a magnetic disk storage drive |
| 03/07/1989 | US4811133 Electronic still video record/play head positioner having both open and closed loop positioning control |
| 03/07/1989 | US4809427 Method for assembling a magnetic head supporting mechanism of a flexible disk drive apparatus |
| 03/01/1989 | EP0304634A2 An improved automatic head position tracking servo for a rotary head magnetic tape recording and reproducing apparatus |
| 03/01/1989 | EP0304633A2 An improved automatic head position tracking servo for a rotary head magnetic tape recording and reproducing apparatus |
| 02/28/1989 | US4809251 Prewritten data storage medium and optical scanning device therefor |
| 02/28/1989 | US4809120 Head position control system |
| 02/28/1989 | US4809107 Guide mechanism for a magnetic head positioning devices |
| 02/28/1989 | US4809106 Lead screw/transducer aligning mechanism for disk drive apparatus |
| 02/28/1989 | US4809094 Method of accessing data recorded on a disk at a high speed |
| 02/28/1989 | US4808901 Control apparatus for linear motor |
| 02/28/1989 | US4808900 Bi-directional difference counter |