Abstract: Deduplication is executed in a storage device having low random access performance, such as an optical disk library. When an optical disk that is not inserted into an optical disk drive needs to be accessed in order to execute binary compare, data to be binary compared is stored in a temporary memory area in order to postpone the binary compare, and on the timing when the optical disk is inserted, the postponed binary compare is executed. Before second deduplication, which is deduplication between data to be stored in the storage device and the data in the optical disk library, is executed, first deduplication, which is deduplication between the data to be stored in the storage device and the data in the temporary memory area, is executed.

Abstract: A disk library apparatus includes a magazine for housing a plurality of storage disks, a plurality of pallets each having a disk placing surface for placing a storage disk and which are arranged in the magazine so that pallets having different engaging claw shapes are adjacent to each other, and a picker for taking out a pallet selected from the plurality of pallets from the magazine. The picker includes at least one arm for taking out the selected pallet from the magazine in the taking-out of the selected pallet. Each of the at least one arm is, in the taking-out of the selected pallet, engaged with an engaging claw of the selected pallet and in a position shifted from an engaging position with an engaging claw of each pallet adjacent to the selected pallet when seen in a pallet arranging direction.

Abstract: A reproducing process of related data is efficiently performed also in a recording medium having recording surfaces at both of front and rear surfaces in a recording and reproducing system including a plurality of recording media. At the time of recording data on a data library apparatus, a recording medium selection unit selects a recording medium and recording surface on which data brought into the same group by a grouping processing unit is recorded.

Abstract: Provided is an optical disk device, including a top case and a bottom case which constitute a housing having a substantially box shape in which: the top case includes, on one side thereof, a hook which engages with the bottom case; the bottom case includes an engaging portion which is provided with a cutout which engages with the hook; and a shielding portion for preventing an air flow passing through the cutout is provided in an inside of the cutout.

Abstract: Erroneous data erasure owing to radiation of laser beam with excessive power to the recording layer of the multilayered optical disc upon servo-off while reproducing data of the disc is prevented. When detecting the servo-off based on the amplitude of the tracking error signal or the focus error signal, the laser beam power is reduced to a predetermined minimum value, and the laser beam power value is set again based on the address of the recording medium, which has been obtained later for reproduction. The laser beam power value is changed by applying an offset to the drive current or changing the target value under APC.

Abstract: In a library apparatus, it is not considered that eliminated is an operation for reversing a direction of a double-sided readable/writable recording medium. In the library apparatus having a function of transporting and loading a recording medium from a recording medium storage unit to a recording and reproducing unit through a recording medium transportation unit, a direction in which an unrecorded recording medium is first loaded in the recording and reproducing unit is afterward treated as a front surface, and a direction opposite to the above direction is treated as a rear surface.

Abstract: In a RAID group using a plurality of recording media readable and writable on both sides, a data configuration such that data on front sides of other disks may be held on back sides of respective double-sided disks is formed and managed, and data for restoration is created from readout data of other data disks than that with failure.

Abstract: The pit arrays on an optical disc medium are made to wobble at a frequency which is higher than the band of frequencies that a tracking servo can follow and which is lower than the band of frequencies of the reproducing signal. A wobble detection signal according to the amount of wobble is obtained from the tracking error signal and used as a reference signal for frequency acquisition. Alternatively, the pit arrays on the medium are wobbled at a frequency which is within the band of frequencies that the tracking servo can follow and which is lower than the band of frequencies of the reproducing signal. In addition, a wobble detection signal corresponding to the amount of wobble is obtained either from the output signal from a compensator included in a tracking servo system or from a tracking drive signal and is used as a reference signal for frequency acquisition.

Abstract: An optical disk cassette has a disk eject mechanism that ejects a disk such as a DVD or CD. The disk eject mechanism has pushrod, transfer and kick out portions. The pushrod portion slides relative to a side of the cassette case. Pivotally mounted within the case, the kick out portion pushes a disk to eject it from the case. The transfer portion translates pushrod motion to motion of the kick out portion. In a preferred embodiment, the disk eject mechanism is a unitary body, with pushrod, transfer and kick out portions made homogeneously as a single entity, the pushrod portion being a resilient joining elbow. In another preferred embodiment, the disk eject mechanism has a transfer portion that is a rack and a pinion. The rack extends from the pushrod portion and the pinion is attached to or formed as part of the kick out portion.

Abstract: If a fault, or deterioration in read-out quality, is detected during recording processing with respect to a first recording face, a duplication is made, with respect to the recorded data on the second recording face of the same recording medium, on a separate recording medium.

Abstract: When power is supplied to an ODD used by being externally attached to a PC via a USB port, it is desirable not to cause an error to occur owing to occurrence of a power-on reset even when the power supplying ability of the PC is insufficient. After the ODD has been connected with the PC and started, the ODD executes an operation of large current consumption for a predetermined period of time and judges whether a power-on reset occurs or not while the operation is being executed. When the power-on reset does not occur, the ODD is set to operate on the basis of the highest specification. When the power-on reset has occurred, the specification is set lower so as to operate the ODD with reduced current consumption.

Abstract: An optical disc drive including a conductive plate provided on a front surface of a disc tray. The conductive plate includes a structure of a hook portion at two places on the right and left and a structure of a pressure bar spring on the side end, in which the conductive plate is fixed using hook holes provided on the disc tray and the pressure bar spring presses and grounds a cabinet with the disc tray loaded in the inside of the cabinet.

Abstract: In an optical disk having multiple layers for which a correction of spherical aberration is required, a spherical aberration correcting element is set to a predetermined spherical aberration correction amount; a laser light source is turned ON; an objective lens is swept; when it is discriminated that the optical disk has two or more layers, or has more than two information recording planes, the spherical aberration correction amount is changed into a spherical aberration correction amount suitable for information recording planes of three, or more layers; and the objective lens is again swept so as to discriminate a total layer number thereof.

Abstract: A disc drive apparatus comprises: a spindle motor 20 for hold a disc 2 and for rotate it; an optical head 7 for conducting either one of recording or reproducing of information onto/from the disc; a driver unit for moving the optical head in a radial direction of the disc; and a unit mechanism chassis 8 for supporting those thereon, fixedly, wherein the spindle motor is constructed with a rotational drive means made of a magnetic circuit, a rotor portion and a rotation shaft, which define a rotation body, and a spindle motor attachment plate to hold those thereon, and the spindle motor attachment plate has a semi-circular shaped plate configuration in a part thereof, nearly fitting to an outer diameter the rotor portion, in a direction where the optical head is provided, and has a step-like structure in thickness direction of the plate thereof, within a semi-circular shaped region with respect to a line connecting between corner portions on both ends of that semi-circular shape, and also bridging over that li

Abstract: Disclosed are media recording/reproducing method and device in which recording stop due to over retrials during replacement process and wasteful conversion processing in the recording/reproducing device are suppressed when a method of managing the spare area of a write-once medium by the use of an NAP is employed to manage the spare area of a rewritable medium. During format or replacement process of the medium, the NAP is so updated that defective blocks registered as unusable clusters or as usable cluster type 2 within DFL entries in the spare area are not shown.

Abstract: An optical disc recording method for recording disc information to be used in recording/reproducing control on an optical disc, comprises the following steps of: providing a first disc information unit and a second disc information unit, each having a predetermined data size, in a predetermined management information area of the optical disc; the disc information includes write strategy information; separating the write strategy information into first write strategy information and second write strategy information; recording the first disc information into the first disc information unit; and recording the second disc information into the second disc information unit.

Abstract: A optical pickup includes: a laser diode; a driver including a first output end of a laser diode drive current; a first line electrically connected to the first output end of the driver and a first port of the laser diode; a second line provided adjacent to the signal line at at least one location or more and electrically connected to a second port of the laser diode; a printed circuit board including the first and second lines; and a metal heat dissipation cover for the driver. The first and second lines form a two layer structure in which the first and second lines are vertically disposed. The line width of the line provided close to the heat dissipation cover is wider than the line width of the other line between the first and second lines in the two layer structure.

Abstract: An optical disc apparatus, for recording or reproducing information by irradiating a laser beam on an optical disc. More particularly, the present application relates to an optical pickup of the optical disc apparatus that produces a tracking error signal, in general, and the optical disc apparatus executes a tracking servo with using the tracking error signal.

Abstract: The invention prevents mark distortion during high-speed recording on an optical disc, thereby improving recording performance. A write pulse signal includes mark periods during which marks 201 are formed and space periods during which no marks are formed. Particular mark periods include a top pulse 101 having first write power Pw; a bias pulse 102 that follows the top pulse 101 and has bias power Pm lower than the first write power Pw; and a last pulse 103 that follows the bias pulse 102 and has second write power Pl lower than the first write power Pw.

Abstract: An optical disc apparatus, presenting recording quality without degradation by an extreme temperature rise in an objective-lens drive mechanism in an optical pickup, includes a mechanical chassis on which a disc rotation mechanism, an optical pickup, and a transfer mechanism are mounted, a decorative plate that is a plate-shaped member located between the disc and the optical pickup and fixed on the mechanical chassis, a disc tray for loading and removing the disc, a circuit board for operation control, and an apparatus housing containing the components. A recess is formed in an indented shape in a portion of the mechanical chassis facing an outer peripheral region of the disc recording surface. An incline is formed in a position close to an opening of the disc tray for mounting the mechanical chassis and opposite the outer peripheral region of the disc recording surface, and slopes gently down to the recess.