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| Number | Title | Issue Date |
| 7957235 | Disk drive and information processing system having the same A disk drive controls the rotational speed of a disk to an appropriate value. A system controller of the drive stores data read from a disk and read-ahead data into buffer memory. A time interval ti at which the buffer memory becomes full is measured, and the time i... | 06/07/2011 |
| 7881167 | Systems and methods of shock recovery in writable optical disc systems Data recovery methods for use with a writable disc system having a writable media are presented including: detecting a write disruption in response to a shock event, the write disruption being defined by a disruption start point, a portion of off-track writing which... | 02/01/2011 |
| 7800993 | Optical recording medium, recording method thereof and evaluation method of optical recording medium A recording method of an optical recording medium comprises irradiating the medium with a laser having m pulse sets each comprising a heating pulse and a cooling pulse, in which m is a natural number; and scanning the medium with the laser at a scanning speed v to r... | 09/21/2010 |
| 7787334 | Optical recording method on multilayer optical recording medium, optical recording apparatus, and multilayer optical recording medium When there is a defect area in a specific recording layer, recording of information is continued and reduction in a recording rate is restrained. In an optical recording method for recording information on a multilayer optical recording medium having a plurality of ... | 08/31/2010 |
| 7436742 | Optical recording device and aberration correction method An optical recording device includes an optical pickup, an asymmetry detection circuit, and a microcomputer. The optical pickup corrects an aberration of an object lens based on an aberration correction value using a liquid crystal panel in the optical pickup, irrad... | 10/14/2008 |
| 7355940 | Optical disk apparatus and waiting method thereof An optical disk apparatus including a waiting position determining circuit which detects physical properties of each region in an optical disk after recording or reproducing processing is finished and decides a waiting position of an optical head according to the de... | 04/08/2008 |
| 7349296 | Write control in response to tracking error A method for controlling writing on a data carrier device, at least including: writing data on the data carrier device with a data writer device; obtaining a tracking error signal corresponding to a position of the data writer device with respect to a track on the d... | 03/25/2008 |
| 7319303 | Method and apparatus for estimating the position of a moving part of a linear actuator A method and an apparatus for estimating the position of a moving part of a linear actuator are provided. The method comprises the following steps. Move the moving part towards a target position. Receive magnetic signals generated by the magneto-resistive sensor of ... | 01/15/2008 |
| 7215619 | Method of scanning a recording disc for defects, and recording device for recording information on a disc-shaped recording medium A method and a DVR video recorder for recording real time video signals on a DVR disc, include detecting large spot disc defects. The integrity of predetermined test tracks is assessed on the basis of a tracking signal. When a defective test track is found, the prox... | 05/08/2007 |
| 7191679 | Electric steering column apparatus An electric tilt and/or telescopic steering column apparatus comprises a steering shaft having a steering wheel mounted on a rear end thereof, a steering column for rotatably supporting the steering shaft, an electric actuator for adjusting the tilt and/or telescopi... | 03/20/2007 |
| 7161881 | Method and system for optical drive write strategies embedded in an optical medium An optical drive writes information to an optical medium by obtaining a write strategy for the optical medium from a write strategy table embedded in the optical medium. A write module in the optical drive reads an optical drive identification code from the optical ... | 01/09/2007 |
| 7136338 | System and method for adjusting a control loop bandwidth The present invention provides a control loop bandwidth adjusting system for adjusting a control loop bandwidth of an optical reproducing device. The optical reproducing device comprises a data signal processing circuit, which uses the control loop bandwidth to proc... | 11/14/2006 |
| 7130340 | Noise margin self-diagnostic receiver logic A noise margin self-diagnostic receiver circuit has been developed. The self-diagnostic circuit includes one comparator for comparing the signal voltage to a high reference voltage, a second comparator for comparing the signal voltage to a low reference voltage, and... | 10/31/2006 |
| RE39013 | Method and apparatus for optical recording and reproducing with tracking servo reducing track offset Disclosed is an optical recording and reproducing apparatus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an... | 03/14/2006 |
| 7002882 | Information recording medium capable of defect management, information recording apparatus capable of defect management, and information playback apparatus for playing back information from defect-managed medium An information recording medium according to an aspect of this invention includes a data area (A2) for recording user data and an address area (DMA address area) for recording address data that indicates the position of a defect management area that manages a... | 02/21/2006 |
| 6963691 | Reproducing apparatus The invention provides an apparatus for reproducing a plurality of image data which has been recorded in a plurality of independent areas on a disk-shaped recording medium and specified so as to be reproduced in predetermined order, from the disk-shaped recording me... | 11/08/2005 |
| 6961879 | Apparatus and method for counting error rates in an optical compact disc storage system A method and system are disclosed for counting error rates occurring within an optical compact disk system as data is read from an optically encoded compact disk. In a preferred embodiment error flag data are generated as errors occur within the optical compact disk... | 11/01/2005 |
| 6947364 | Detecting track jumps during reading or writing of data on an optical disk In use of an optical disk such as a Digital Versatile Disk (DVD) it is sometimes desirable to detect if a track jump occurs as quickly as possible after the occurrence. The optical disk format includes a pre-groove track structure which provides the frame work upon ... | 09/20/2005 |
| 6801482 | Information record/reproduction unit and method thereof An information reproduction unit has a data read means with a pickup for intermittently reading data recorded on a storage medium, a write means for writing the data in a memory, and a reproduction means for sequentially reading out the data written in the memory. T... | 10/05/2004 |
| 6631106 | Spare area with a predetermined capacity for a detective sector allocated in each zone In a rewritable optical recording medium, a recording surface is divided into a plurality of zones by setting pitch intervals in the radial direction to be constant and a data area and a spare area for a defective sector are allocated in each zone. As for... | 10/07/2003 |
| 6510112 | Drive apparatus for optical recording medium An apparatus for driving an optical pickup for a tracking servo control. The apparatus includes an emitting device disposed in the optical pickup for emitting a main beam to a first position on an information track of a recording medium and emitting at le... | 01/21/2003 |
| 6094723 | Copy protection system for recording media The number of times installation has been performed is recorded in a recording and reproduction area of a recording medium as installation is performed. When an application program is requested to be installed to another recording medium, the number of ti... | 07/25/2000 |
| 5909414 | Optical information recording and reproducing apparatus having a function of preventing overwrite recording An optical information recording apparatus for at least recording information by irradiating an optical information recording medium having a plurality of information tracks with at least one light beam. The apparatus includes a recorder for recording inf... | 06/01/1999 |
| 5872955 | Method and apparatus for reading and writing data in a disk drive system To reduce read and write times for data in a disk drive, the data of a file is rearranged into continuous recording areas on a disk. A file has a host-specified address and a physical address. The physical address corresponds to the recording area on a di... | 02/16/1999 |
| 5523799 | Image storing device including an inhibiting function A memory capable of memorizing a video signal has part of its address area into which an information signal is inhibited from being written. A writing address controller for cyclically specifying writing addresses of the memory cyclically specifies writin... | 06/04/1996 |
| 5513260 | Method and apparatus for copy protection for various recording media A method and apparatus for copyright protection for various recording media such as compact discs (CDs) uses a combination of symmetrical and asymmetrical data encryption to permit the player to handle either copy-protected or non-copy-protected media, in... | 04/30/1996 |
| 5491676 | Tracking control apparatus and track jump detection apparatus A tracking control apparatus having a track jump detection device and a memory for storing driving signals for the tracking control detects a track jump, and when such a track jump has occured, makes the tracking control inoperative, decelerates the veloc... | 02/13/1996 |
| 5426627 | Optical information recording/reproducing apparatus An optical information recording and/or reproducing apparatus, wherein an information recording medium and an optical head are moved relatively in a track direction to record optical information in the information recording medium and/or reproducing optic... | 06/20/1995 |
| 5420838 | Disk recording and reproducing device A disk recording and reproducing device records and reproduces information on and from a magneto-optical disk having 3 3 and there is TOC (Table of Contents) area. Additional information with respect to each piece of the information recorded in the inform... | 05/30/1995 |
| 5305298 | Optical data recording/reproducing apparatus with optical irradiation inhibition circuit In an apparatus for optically recording data on and reproducing it from an optical disk, the level of a laser beam in reproducing mode is subjected to feedback control and the level of a laser beam in recording mode is controlled in accordance with the ou... | 04/19/1994 |
| 5293366 | Information recording and reproducing apparatus provided with means for adding to a tracking signal offset corresponding to the positional deviation of a recording spot and a reproducing spot An apparatus for effecting the recording and reproduction of information on an information track on a recording medium, includes a device for applying a first light spot to the information track to thereby record information, a device for applying a secon... | 03/08/1994 |
| 5233576 | Multi-function optical disk drive and media Disclosed is an apparatus and method for defining magneto-optical disk media and an optical data storage device that allows the media to be convertible from writable to read-only. The media has a media descriptor table contained within a control track whi... | 08/03/1993 |
| 5233584 | Optical disk device using high and low data-sensing criteria plus device recalibration for error control Error control procedures are described for an optical disk recorder. High and low criteria for each of a plurality of machine operations or functions of an optical disk recorder are described. Such functions include erasing a sector, writing data, and rea... | 08/03/1993 |
| 5224085 | Optical recording and reproducing apparatus that cancels recording or erase mode if focus or tracking is improper An optical recording and reproducing apparatus comprising an erroneous recording prevention component which prevents this apparatus from making an erroneous recording or erasing operation while it records data on a writable disk. The apparatus is arranged... | 06/29/1993 |
| 5184337 | Optical recording/reproducing apparatus having means for periodically supervising drive current supplied to actuator The results output from a comparator, which makes a comparison to determine whether or not the drive current to be supplied to a focusing/tracking actuator of an optical system in which light beams are condensed and applied to an optical recording medium,... | 02/02/1993 |
| 5181194 | Writing device for optical memory card A writing device for an optical memory card is disclosed. In this writing device, tracking correction is performed by moving a mobile objective lens of an optical system in the transverse direction of a track in accordance with a tracking error of the opt... | 01/19/1993 |
| 5151888 | Optical information processing apparatus in which the output of an optical sensor is replaced by a reference signal during the occurrence of malfunction An optical information processing apparatus effects recording and/or reproduction of information by scanning information tracks of an optical recording medium by at least one condensed light beam while effecting tracking and/or focusing control. The appar... | 09/29/1992 |
| 5148420 | Recording information apparatus having a head speed detector A recording information apparatus for a recording medium having a track previously formed on the recording medium. The apparatus includes an objective lens for projecting a light beam on the optical disc, an optical head for carrying the objective lens, a... | 09/15/1992 |
| 5126895 | Shockproof data transducer position control system for rotating disk data storage apparatus A transducer position control system capable of shockproofing a hard disk data storage apparatus. Included is an off-track detector circuit relying on servo bursts prerecorded on the disk for detecting if the transducer is positioned within predetermined ... | 06/30/1992 |
| 5126993 | Optical data recording/reproducing apparatus including device for preventing erroneous light emission In an apparatus for optically recording data on and reproducing it from an optical disk, the level of a laser beam in reproducing mode is subjected to feedback control and the level of a laser beam in recording mode is controlled in accordance with the ou... | 06/30/1992 |
