Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7502283 | Systems and methods for rewriting data of data tracks potentially affected by data transfer operations in rotatable storage media Systems and methods in accordance with embodiments can be used to re-write user data to a rotatable storage medium. When a position of a write element is not within a threshold during a data write operation, a part of a data track potentially affected by the write o... | 03/10/2009 |
| 7301855 | Apparatus and method for storing ROM and RAM data into magneto-optical recording medium An optical disk apparatus records new information related to the ROM information into RAM at a position linked with the ROM information of an optical information storage medium while continuously regenerating the ROM information of the optical information storage me... | 11/27/2007 |
| 7260027 | Optical storage medium in which sector address information is recorded using MSR techniques A storage medium stores information on a plurality of tracks formed thereon, each of the tracks being divided into a plurality of sectors. The storage medium includes a physically formed sector beginning identifier provided at a leading portion of each sector, and a... | 08/21/2007 |
| 7151738 | Apparatus and method for coupling light to a thin film optical waveguide An optical waveguide comprises a core guiding layer; a cladding layer positioned adjacent to the core guiding layer; a reflective layer positioned adjacent to the cladding layer; and a grating for coupling light into the core guiding layer; wherein the cladding laye... | 12/19/2006 |
| 7106663 | Disk recording/reproducing apparatus provided with magnet head ascending/descending mechanism The disk recording/reproducing apparatus of the present invention has a magnetic head which ascends or descends between a descent position proximate to a disk recording medium housed in a cartridge and an ascent position which is separate from the medium, an ascendi... | 09/12/2006 |
| 7085200 | Stepping motor controlling method and disk apparatus A disk apparatus includes a pick-up for reading/writing signals from/on a disk; a pick-up base provided with the pick-up; a traverse motor for moving the pick-up in a radial direction of said disk; a feed screw rotated by the traverse motor and provided with a threa... | 08/01/2006 |
| 6980489 | INFORMATION RECORDING/REPRODUCING APPARATUS FOR RECORDING/REPRODUCING INFORMATION WITH RESPECT TO INFORMATION STORING MEDIUM WITH GUIDE TRACKS AND INFORMATION TRACKS, AND TRACKING METHOD USING THE INFORMATION STORING MEDIUM A magnetic tape has a guide track for optically obtaining a tracking signal and an independent information track for storing information. The magnetic tape is partitioned into different kinds of zones. The guide tracks are provided with grooves or pits serving as tr... | 12/27/2005 |
| 6853513 | Magnetic scanning system A scanning device for scanning data-carrying disks. The disks include a magnetisable layer to and from which data is written and read using a magnetic transducer, such as a Giant Magneto-Resistive (GMR) transducer. Positioning of the transducer over a data track is ... | 02/08/2005 |
| 6788625 | Optical storage medium in which sector address information is recorded using MSR techniques A storage medium stores information on a plurality of tracks formed thereon, each of the tracks being divided into a plurality of sectors. The storage medium includes a physically formed sector beginning identifier provided at a leading portion of each sector, and a... | 09/07/2004 |
| 6744582 | Thermal-assisted magnetic storage device and method for driving the reading/writing head thereof A thermal-assisted magnetic storage device includes a magnetic recording media of a transparent material, a first marker of a material that is optically singular compared with materials therearound, and a magnetic head disposed on a magnetic head slider facing a rec... | 06/01/2004 |
| 6687200 | Recording/reproducing apparatus for recording data in recording pits A recording/reproducing apparatus is configured to displace near-field light for recording or reproduction and tracking illumination light toward an outer periphery of a recording pit when an off-track state toward the outer periphery occurs. The amount o... | 02/03/2004 |
| 6618218 | Displacement detecting apparatus and information recording apparatus An apparatus for detecting the relative displacement of a surface to be detected, and an apparatus and method for recording information on a hard disc of a hard disk drive using such a detecting apparatus, the detecting apparatus comprising an interferenc... | 09/09/2003 |
| 6532125 | Apparatus and method suitable for magnetic-thermal recording The invention discloses novel apparatus/methodology for writing/erasing high-density data on a digital recording media. A preferred embodiment of the invention features a novel thermal near-field heater that may be employed in the apparatus, particularly ... | 03/11/2003 |
| 6278665 | Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same An optical drive system includes a computer that monitors the current in the bias coil of a magnetomotive field generator to determine when a predetermined current threshold is exceeded. When the threshold is exceeded, a sufficiently strong magnetic field... | 08/21/2001 |
| 6044042 | Method and apparatus for inverting a bias field for magneto-optic recording and erasing A bias-field apparatus for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on o... | 03/28/2000 |
| 6021100 | Magneto-optic disk drive Disclosed is a magneto-optic disk drive, which has: a holder which holds a magneto-optic disk and rotates the magneto-optic disk in a predetermined direction; two carriages which are opposite to each other while sandwiching the magneto-optic disk and are ... | 02/01/2000 |
| 5799212 | Efficient recording medium A recording medium has a user recordable area in which two types of information may be recorded, such as audio data and user data, and a control area having a first area for management information regarding the first type of information and a second area ... | 08/25/1998 |
| 5768236 | Recording and reproducing apparatus and method using a buffer memory to ensure continuous output during track jumps caused by either vibration or fast reproduction mode A reproducing apparatus for a recording medium such as an optical disk, includes a head, a memory, and a controller. The head is relatively moved with respect to the recording medium so as to read audio data recorded on the recording medium. The memory te... | 06/16/1998 |
| 5687397 | System for expansion of data storage medium to store user data A recording medium has a user recordable area in which two types of information may be recorded, such as audio data and user data, and a control area having a first area for management information regarding the first type of information and a second area ... | 11/11/1997 |
| 5553055 | Disc playback method A method for fast playback of a disc in a cue or review mode to reproduce therefrom audio data compressed and recorded burstly by a predetermined amount as a unit. The method comprises predetermining a unitary block of data which consists of n times (wher... | 09/03/1996 |
| 5495455 | Magneto-optical disk recording and reading apparatus and method wherein the recording head is controlled in the radial direction of the disk to a desired position A magneto-optical disc recording apparatus includes a magnetic head, an optical head, a position detector and a controller. The magnetic head supplies a vertical magnetic field corresponding to recording data to a magneto-optical disc. The optical head em... | 02/27/1996 |
| 5448552 | Super resolution information reproduction by tracking address information in normal resolution An optical disk includes: a substrate shaped in a disk, and having a recording surface; a plurality of recording tracks formed substantially coaxially on the recording surface; a plurality of information pits, which are reproducible by a super resolution ... | 09/05/1995 |
| 5381399 | Head shifting apparatus Disclosed is a head shifting apparatus for shifting a head relative to a recording medium, which comprises a shifting mechanism for shifting the head stepwise, detecting means for detecting when the head reaches a predetermined reference position and cont... | 01/10/1995 |
| 5239532 | Drive arrangement for the writing/reading heads of a magneto-optical disc apparatus A device for inscribing and/or reading a magneto-optical disc (7), including a frame (1) carrying a turntable (5) which is rotatable about an axis of rotation (11), a slide (17) carrying an optical unit (19) a rectilinear guide (15) for the slide arranged... | 08/24/1993 |
| 5208792 | Recording and reproducing apparatus using opto-magneto media An apparatus is provided for recording and reproducing information signals on an opto-magnetic disk at a high speed using plural light beams. The phase relation between the information signals is fixed when they are simultaneously recorded and reproduced ... | 05/04/1993 |
| 5206570 | Actuator servo compensation method An actuator control loop for controlling head position in a rotating media data storage system. The invention applies the compensation zero to the PES prior to summing it with the integrator. This scheme reduces transients caused by the integrator initial... | 04/27/1993 |
| 5184339 | Information recording-reproducing head driving circuit An information recording-reproducing head driving circuit for moving an information recording-reproducing head from the current position on a recording medium to a desired position while velocity-controlling the head includes a pulse motor for moving the ... | 02/02/1993 |
| 5020041 | Magneto-optical memory apparatus having a floating magnetic head A magneto-optical memory apparatus has an optical head for applying a light to a substrate of a recording medium such as a magneto-optical disk having a magneto-optical recording film formed on the substrate and continuously applying a high power laser be... | 05/28/1991 |
| 4879703 | Magneto-optic memory apparatus with defect detection of recording medium during erasing operation A magneto-optic memory apparatus is disclosed in which a laser beam is focused on a recording medium having a perpendicularly-magnetized film, the intensity of said laser beam is caused to correspond to reproducing, recording and erasing operations, an ex... | 11/07/1989 |
| 4807210 | Optical information processing apparatus An optical information processing apparatus uses an optical disk having correction marks such as mirror surfaces or wobbled pits intermittently arranged along a guide track. In a reproduce mode, tracking control is effected by correcting a tracking signal... | 02/21/1989 |
| 4733385 | Signal recording and reproducing apparatus for an opto-magnetic disk A signal recording and reproducing device for use with an opto-magnetic disk having a number of concentric recording tracks. An optical head sweeps a given track at least twice during a time interval equal to a predetermined reproduction time for the trac... | 03/22/1988 |
| 4730289 | Magnetic-optical disc memory system and apparatus for switching header and data information A magnetic-optical disc memory system wherein header information items which include sector marks indicating initial positions of sectors, track Nos., and sector Nos. are previously provided on a magnetic-optical disc in the form of embossed pits and wher... | 03/08/1988 |
| 4660190 | Optical focus position control in optical disc apparatus Disclosed below is a control device for positioning an optical focus in an optical disc apparatus that records, plays back, and erases any information by irradiating optical beams such as the laser beams onto a recording media composed of magnetic film, w... | 04/21/1987 |
