Patents by Inventor Takashi Katagiri

Takashi Katagiri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100302667
    Abstract: A plurality of tape drives writes a plurality of indicators corresponding to a plurality of data units on a tape, wherein an indicator indicates which tape drive of the plurality of tape drives has written a corresponding data unit on the tape. Each of the plurality of tape drives generates an extent of read errors, in response to reading the plurality of data units written on the tape. The extent of read errors generated by each of the plurality of tape drives are aggregated at a computational device coupled to the plurality of tape drives. A determination is made at the computational device of a defective tape drive of the plurality of tape drives from the aggregated extent of read errors.
    Type: Application
    Filed: August 6, 2010
    Publication date: December 2, 2010
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Scott Milton Fry, Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri, Pamela Ruth Nylander-Hill, Yutaka Ooishi
  • Publication number: 20100288928
    Abstract: An apparatus for measuring a terahertz wave includes a dispersing section 103 for chirping the terahertz wave 104 generated from a generating section 101. A detecting section 102 detects waveform information on the terahertz wave chirped by the dispersing section 103. As a result, it is possible to acquire frequency information included in the waveform information. Therefore, it is possible to acquire spectral information including amplitude information of each frequency component and intensity information on each frequency or wavelength from the time waveform without Fourier-transforming the time waveform.
    Type: Application
    Filed: January 16, 2009
    Publication date: November 18, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Katagiri, Takeaki Itsuji
  • Patent number: 7821728
    Abstract: A plurality of tape drives writes a plurality of indicators corresponding to a plurality of data units on a tape, wherein an indicator indicates which tape drive of the plurality of tape drives has written a corresponding data unit on the tape. Each of the plurality of tape drives generates an extent of read errors, in response to reading the plurality of data units written on the tape. The extent of read errors generated by each of the plurality of tape drives are aggregated at a computational device coupled to the plurality of tape drives. A determination is made at the computational device of a defective tape drive of the plurality of tape drives from the aggregated extent of read errors.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: October 26, 2010
    Assignee: International Business Machines Corporation
    Inventors: Scott Milton Fry, Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri, Pamela Ruth Nylander-Hill, Yutaka Ooishi
  • Publication number: 20100118430
    Abstract: A computer implemented method of writing data to a linear tape is provided and includes, of the data to be written to the linear tape, distinguishing between data and meta-information, writing both the distinguished meta-information and undistinguished meta-information to a data area of the linear tape and the distinguished meta-information to a reserved area at a leading end of the linear tape, and retaining information reflective of the meta-information and a location thereof in a specified position of the reserved area.
    Type: Application
    Filed: November 11, 2008
    Publication date: May 13, 2010
    Applicant: International Business Machines Corporation
    Inventors: Shinobu Fujihara, Takashi Katagiri
  • Patent number: 7710681
    Abstract: Provided are techniques for determining a tape speed for a next sync operation. A sync command is received. An average transaction size and an average host transfer rate of a set of previous sync operations are calculated. The tape speed for the next sync operation is determined using the average transaction size, the average host transfer rate, and a backhitch time. Data is written to a tape cartridge using the determined tape speed.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: May 4, 2010
    Assignee: International Business Machines Corporation
    Inventors: Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri
  • Publication number: 20100095029
    Abstract: A tape drive, tape drive recording system, and method are provided for improving tape speed selection during data transfer. The tape drive comprises a buffer, a tape for recording the data to be temporarily stored in the buffer, and a read head. The tape drive further comprises a reading controller that initially sets a tape speed such that a drive transfer rate matches a host transfer rate as closely as possible and that drives the tape at the tape speed. To address backhitching caused by one or more host transfer halts, the reading controller subsequently adjusts the tape speed such that the drive transfer rate is lower than the host transfer rate by recalculating the host transfer rate in consideration of the host transfer and the host transfer halt and setting the tape speed such that the drive transfer rate matches the recalculated host transfer rate as closely as possible.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 15, 2010
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Takashi Katagiri, Hirokazu Nakayama, Motoko Oe, Yutaka Oishi
  • Publication number: 20100084570
    Abstract: Provided is a terahertz wave generator that improves efficiency of generating a terahertz wave. The terahertz wave generator includes a generating layer for generating the terahertz wave, a waveguide layer for propagating excitation light entering the generating layer and a terahertz wave generated by the excitation light entering the generating layer, and a first confinement layer for confining in the waveguide layer the excitation light propagating in the waveguide layer and the terahertz wave propagating in the waveguide layer. The generating layer, the waveguide layer, and the first confinement layer are laminated in the stated order.
    Type: Application
    Filed: September 30, 2009
    Publication date: April 8, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Takashi Katagiri
  • Publication number: 20100053801
    Abstract: A device and method are disclosed for processing data recorded on a tape medium. The device comprises a first control part controls a read head to read specific data recorded in a first area among data recorded in a first format on the tape medium. The device further comprises a second control part that controls a write head to write the specific data in a second area different from the first area of the tape medium and to write the specific data in a second format in a third area different from the second area of the tape medium. Moreover, the device may comprise a recording part for recording specific information that specifies a read position of other data among data recorded in the first format on the tape medium.
    Type: Application
    Filed: August 10, 2009
    Publication date: March 4, 2010
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Takashi Katagiri, Yutaka Oishi
  • Publication number: 20100007978
    Abstract: A plurality of tape drives writes a plurality of indicators corresponding to a plurality of data units on a tape, wherein an indicator indicates which tape drive of the plurality of tape drives has written a corresponding data unit on the tape. Each of the plurality of tape drives generates an extent of read errors, in response to reading the plurality of data units written on the tape. The extent of read errors generated by each of the plurality of tape drives are aggregated at a computational device coupled to the plurality of tape drives. A determination is made at the computational device of a defective tape drive of the plurality of tape drives from the aggregated extent of read errors.
    Type: Application
    Filed: July 11, 2008
    Publication date: January 14, 2010
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Scott Milton Fry, Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri, Pamela Ruth Nylander-Hill, Yutaka Ooishi
  • Publication number: 20090303633
    Abstract: A method to write information to a tape storage medium by disposing a tape storage medium in a tape drive apparatus comprising a write head. The method moves the tape storage medium in a first direction, writes data from a buffer to the tape storage medium, and thereby empties the buffer while the tape storage medium is moving in the first direction. The method determines, while the tape storage medium is moving in the first direction, whether to enable a backhitchless write wherein the tape storage medium is not stopped and moved in a second and opposition direction, prior to writing new data to the tape storage medium. By not stopping the movement of the tape storage medium, and by not moving the tape storage medium in a reverse direction to reposition the write head, the method eliminates the time overhead required to stop the tape and reposition the tape head. Applicants' method achieves this time efficiency without adverse impact to the nominal storage capacity of the tape information medium.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 10, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri, Motoko Oe, Yutaka Ooishi
  • Publication number: 20090296268
    Abstract: A system and method for controlling the traveling of a tape is provided. The system and method include passing data in a buffer to a channel input/output unit for writing the data to a tape. Once the data is written to the tape, a determining unit determines whether or not to perform backhitchless writing. If backhitchless writing is to be performed, then a speed determining unit determines a tape speed, where the time of data transfer from a host to the buffer is less than the time of data writing from the buffer to the tape. Thereafter, an operation signal output unit instructs a motor driver to change the speed of the tape to the determined tape speed after a backhitch is performed is a speculative FM.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 3, 2009
    Applicant: International Business Machines Corporation
    Inventors: Takashi Katagiri, Motoko Oe
  • Publication number: 20090296267
    Abstract: In a controller of a tape drive, when a command processing unit receives a Write FM0 command, a channel input/output unit writes the data in the buffer and a speculative FM onto the tape, and a CM input/output unit records speculative FM presence information in a cartridge memory. When the command processing unit receives Write FM1 command next, the CM input/output unit erases the speculative FM presence information from the cartridge memory. When the command processing unit receives a command other than Write FM1 command next, the channel input/output unit overwrites a speculative FM.
    Type: Application
    Filed: April 30, 2009
    Publication date: December 3, 2009
    Applicant: International Business Machines Corporation
    Inventors: Hiroshi Itagaki, Takashi Katagiri
  • Patent number: 7587546
    Abstract: A device, method, and machine-readable medium program product for controlling a tape data storage drive are disclosed. According to one embodiment, a device is provided for controlling a tape drive operable with a tape storage medium, the device comprising a buffer memory and a first functional unit. In the described embodiment, the first functional unit is configured to identify a logical end of the tape storage medium utilizing first data specifying a quantity of data stored within the buffer memory and second data specifying a current data write position on the tape storage medium.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: September 8, 2009
    Assignee: International Business Machines Corporation
    Inventors: Hiroshi Itagaki, Takashi Katagiri, Hirokazu Nakayama
  • Publication number: 20090213880
    Abstract: A pulse laser apparatus includes a laser configured to generate a pulse of a laser beam, a fiber amplifier, and a pulse compressor. The fiber amplifier includes a rare-earth doped fiber that exhibits normal dispersion at a wavelength of the laser beam generated from the laser. The pulse laser apparatus further includes a unit configured to give a loss to energy portions in a wavelength region corresponding to a zero-dispersion wavelength of the rare-earth doped fiber and/or a wavelength region longer than the zero-dispersion wavelength within a wavelength spectrum of the laser beam having been chirped in the fiber amplifier.
    Type: Application
    Filed: January 15, 2009
    Publication date: August 27, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshihiko Ouchi, Takashi Katagiri, Kentaro Furusawa
  • Publication number: 20090190893
    Abstract: Optical pulse compressor having a chirp unit including a normal dispersion fiber that provides a positive chirp to an input pulse and having a dispersion compensator including an anomalous fiber is provided. The nonlinear coefficient and the absolute value of the second-order group-velocity dispersion of the anomalous fiber that forms the dispersion compensator is set such that a soliton order becomes one or more, and the fiber length of the anomalous dispersion fiber is made to be equal to or smaller than a length required for optical soliton formation.
    Type: Application
    Filed: January 16, 2009
    Publication date: July 30, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Katagiri, Toshihiko Ouchi, Kentaro Furusawa
  • Publication number: 20090180212
    Abstract: The present invention enhances the capability to specify a recorded position of designated data, even when a tape medium is run at high speed. A controller of a tape drive includes: a data set generator for generating a data set; a metadata generator for generating metadata including the number of records in the data set and the like; and a writing unit for writing the data set to the tape medium with a high recording density, and writing the metadata to the tape medium with a low recording density. The controller also includes: a movement controller for receiving a record number of a designated record; a reading unit for obtaining the number of records and the like included in the metadata read by running the tape medium at high speed; and a comparison unit for determining whether or not to read the data set by lowering the speed of the tape medium to R/W speed, in comparison with the record number received by the movement controller and the number of records and the like obtained by the reading unit.
    Type: Application
    Filed: January 5, 2009
    Publication date: July 16, 2009
    Inventors: Takashi Katagiri, Toshiyuki Shiratori
  • Publication number: 20090063763
    Abstract: A method for controlling writing for a tape recorder that is connected to a host and sequentially records, as a transaction, a plurality of records that are transferred from the host and stored in a buffer is provided, including receiving a synchronous command for a first transaction from the host; in response to the synchronous command, sequentially writing the plurality of records stored in the buffer to a tape as the first transaction; receiving the size of a second transaction following the first transaction from the host; calculating time for a backhitch associated with an operation of the synchronous command for the first transaction on the basis of the size; and performing the backhitch on the basis of the time for the backhitch.
    Type: Application
    Filed: November 5, 2008
    Publication date: March 5, 2009
    Inventor: Takashi Katagiri
  • Patent number: 7496696
    Abstract: A method for evaluating data transfer performance within a data recording apparatus is disclosed. The data recording apparatus includes a buffer and a recording medium. Initially, a Pause time P when data transfer between the buffer and a host being stopped temporarily is measured. Then, an ideal Pause time Y is determined. Next, a determination is made whether or not the Pause time P exceeds a sum of the ideal Pause time Y and an allowance a. If the Pause time P exceeds a sum of the ideal Pause time Y and the allowance a, a warning signal is sent to the host.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: February 24, 2009
    Assignee: International Business Machines Corporation
    Inventors: Takashi Katagiri, Hironobu Nagura, Hirokazu Nakayama, Kazuhiro Ozeki
  • Patent number: 7490253
    Abstract: An illuminance sensor detects an illuminance value for an environment in which a display device is placed and provides the illuminance value to a controller. The controller determines whether to cause the display device to make a transition to a power saving mode or not in accordance with the illuminance value inputted thereto. For the transition to the power saving mode, the controller stops the operation of a backlight drive signal generator to turn off a backlight unit, and stops the supply of power and a display signal to a liquid crystal panel.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: February 10, 2009
    Assignee: NEC - Mitsubishi Electric Visual Systems Corp.
    Inventors: Kazuo Yoshioka, Tomohiro Nakagawa, Yoshiyuki Shirasaki, Takashi Katagiri
  • Patent number: 7483231
    Abstract: An apparatus, system, and method are disclosed for redundant identification of a storage medium format. The apparatus for redundant identification of a storage medium format is provided with a plurality of modules configured to functionally execute the necessary steps of writing a Format Identification Data Set (“FID”) to a plurality of predetermined locations on the storage medium, determining a format of the storage medium based on information in the FID, and setting a starting position on the storage medium for a subsequent operation, wherein the starting position is associated with the format of the storage medium. These modules in the described embodiments include a write module, a determination module, and a position module. In a further embodiment, the storage medium may include a data storage tape housed within a tape cartridge, wherein the tape cartridge further comprises a cartridge memory (“CM”) for storing a CM FID.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: January 27, 2009
    Assignee: International Business Machines Corporation
    Inventors: Paul Merrill Greco, Hiroshi Itagaki, Takashi Katagiri, Hirokazu Nakayama