Hitachi-lg Data Storage, Inc.

Hitachi Consumer Electronics Co., Ltd.

Hitachi, Ltd.

Kenji Akahoshi

Taku Hoshizawa

Takakiyo Yasukawa

Atsushi Saito

Masayuki Hirabayashi

Yutaka Nagai

Koichiro Nishimura

Junichi Ishii

Shinji Fujita

Yoshinori Ishikawa

Takeyoshi Kataoka

Norimoto Ichikawa

Atsushi Fuchiwaki

Makoto Nihei

There is provided a distance measurement system in which a plurality of distance measurement sensors are installed to detect an object in a measurement area, the system including: a detection intensity distribution display device that performs quantification according to light intensities of light which reaches the object after being emitted from the distance measurement sensors, or point cloud numbers, and displays colors or lights and shades according to magnitudes of numerical values to perform visualization and a display. The detection intensity distribution display device regards a space in front of the distance measurement sensors as one cube, divides the cube into a plurality of small cubes (voxels), and quantifies a detection intensity according to the light intensity of the light that reaches each of the voxels after being emitted from the distance measurement sensors, or the point cloud number of each of the voxels.

Distance measurement system and method for displaying detection intensity distribution of distance measurement sensor

An optical information recording and reproducing apparatus and an optical information recording and reproducing method which make it possible to conduct alternation processing efficiently even if a buffer capacity is limited, in retry processing at time when a verify error is detected are provided. In an optical information recording and reproducing apparatus for recording data onto optical information recording media and reproducing data from the optical information recording media, verify processing is conducted in a predetermined recording quantity unit. Upon detection of a verify error in recorded data, a host computer is requested to retransfer data which has caused the verify error, and received data is intruded in a next scheduled recording quantity unit and recorded onto the optical information recording media.

Optical information recording and reproducing apparatus, optical information recording and reproducing method, and data library apparatus

In the case where a spare area management method using an NAP of a spare area on a recordable medium is applied to a spare area management method of a spare area on a rewritable medium, in order to alleviate a recording stop caused by retry over in a replacement process or unnecessary conversion processes in a record/reproduce device, the NAP is updated in a format process or in the replacement process in such a way as to avoid defective blocks within the spare area which is registered as Unusable Cluster or Usable Cluster Type 2 entries on the DFL.

Media record/play device and media record/play method

If a recording error has occurred during RAW, then subsequent recording reproducing processing is omitted in a predetermined range, and all blocks omitted in the processing are handled as defective blocks, DFL-registered, and recorded in a replacement area. As a result, it becomes possible to hold down the number of times of recording processing accompanied by seek processing in the RAW processing, and transfer rate lowering can be solved.

Recording reproducing apparatus and recording reproducing method

The invention solves the problem that data cannot be recorded on a disc because the number of registered Defect Lists (DFLs) has reached a limit and the problem that the access performance is reduced at recording data reproduction time. A cluster, which is normally reproduced during verification processing and is preceded and followed by one or more defective blocks, is also treated as a defective block and, together with the preceding and following defective clusters, recorded in an spare area for extending the range in which clusters are registered as Contiguous Re-allocated Defect (CRD) entries. This reduces the number of DFLs to solve the problem that data cannot be recorded on the disc and, in addition, reduces the number of seek operations to prevent the access performance from being reduced at reproduction time.

Recording and reproducing apparatus and method

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 typewithin DFL entries in the spare area are not shown.

Media recording/reading device and media recording/reading method

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.

Optical disc and optical disc apparatus

An optical information recording and reproducing apparatus includes an irradiation unit of a signal light beam and a reference light beam required for data recording, and a cure irradiation unit having at least one of a pre-cure irradiation that irradiates a predetermined light beam on to a desired position prior to irradiating the reference light bean and the signal light beam on to the desired position when information is recorded in the desired position on an optical information recording medium and a post-cure irradiation that irradiates a predetermined light beam on to the desired position so as to make the desired position non-recordable after the information is recorded in the desired position on the recording medium. The cure irradiation unit is disposed in one driving device in a freely movable manner in the driving device.

Optical information recording and reproducing apparatus and optical information recording method

Medium recording and reproduction apparatus and method can prevent prohibition of disc recording due to the fact that laser power calibration area becomes unusable by studying a management information update method during data recording. When usable capacity of the laser power calibration area is monitored and the capacity is reduced, management information area to be currently updated is changed to another layer.

Recording and reproduction apparatus and method for monitoring and managing laser power calibration areas in a multi-layer recording medium

Where a hybrid disc has different types of media, the light spot moves among recording layers of the different media, after loading the disc into an optical disc apparatus, there is a problem that information on a media type of each recording layer should be recorded in DI etc. of the optical disc. Detailed information on the hybrid disc is stored in DI, by changing a disc layer type identifier or a disc structure in DI such as BCA or PIC on the optical disc.

Optical disc reproducing apparatus for implementing an optical recording and reproducing method for multi-layer optical discs

A recording/reproducing apparatus, for conducting edition works, such as, addition, movement, and deletion, etc., of data, onto a postscript type medium, defective management of which is conducted with using a replacement area, is disclosed. The apparatus includes a media information management unit. The medium management information is recorded by a renewal unit within a medium management information area. The apparatus further includes a replacement address information management unit. This is included within the medium management information. Furthermore, the apparatus includes an available number of times of edition works calculation unit. The available number of times of edition works calculation unit calculates the remaining available number of times of edition works, upon basis of remaining capacity of the medium management information area and renewal units thereof. Accordingly, display or notification of a correct available number of times of edition works to a user occurs.

Medium recording/reproducing apparatus enabling to notice of edition number and method for managing edition number of times

A Spare Area kept unused on a disk is available for use other than spare processing, or Defect Management process, and compatibility of the disk is at least secured between different recording apparatuses. This is implemented by recording a SWP_PAC cluster defined as a new item and by recording address information of used addresses in a PAC or TDDS area.

To prevent the degradation in read access performance to replacement data caused by not selecting appropriate replacement clusters and to suppress the waste of the number of DFL registrations. Attention is paid to the usage direction of a user data area and that of a replacement area, and in the case where one CRD-type DFL registration can be made collectively in the sequential defect management processes, a replacement area of which the usage direction is the same as that of the user data area is selected.

Apparatus and method for using replacement areas having certain usage directions, based on whether defects are registered as re-allocated or contiguous re-allocated defect types, in a recording medium

On an optical disk medium, a spare area is allocated separately from a recording area. If the recording area includes a defective sector, alternate recording for the defective sector is performed in the spare area. An optical disk drive comprises: a medium information acquisition part which acquires, from the optical disk medium, medium information specific to the medium; and an area size determination part which determines the spare-area size suitable for the medium on the basis of the acquired medium information. The medium information is information about, for example, a media manufacturer, and a media type number. Further, there is provided a table which stores the relationship between the medium information and the optimum size of the spare area.

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Yokohama, Japan

Kenji Akahoshi