Patents by Inventor Tetsuhiro Kohada

Tetsuhiro Kohada 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: 20250045204
    Abstract: An object of the present disclosure is to provide a cache memory control apparatus and a cache memory control method capable of improving the efficiency of the cache memory usage. According to the present disclosure, a cache memory control apparatus includes a read request acquisition unit configured to acquire a read request including a location of data in an external storage device, a priority determination unit configured to determine priority of discarding of data stored in a cache memory based on the location of data included in the read request acquired by the read request acquisition unit, and a discarding unit configured to discard data stored in the cache memory based on the priority determined by the priority determination unit.
    Type: Application
    Filed: February 28, 2022
    Publication date: February 6, 2025
    Applicant: Mitsubishi Electric Corporation
    Inventor: Tetsuhiro KOHADA
  • Publication number: 20200026848
    Abstract: A storage of an information processing apparatus stores data, and stores a password when the password has been set. If an entered password matches the password stored in the storage, an individual PW writer of a PW management unit of a controller performs at least one of data reading processing and data writing processing on the storage. The attachment state determination unit determines whether or not the information processing apparatus has been attached to an attachment target. In the case where the attachment state determination unit determines that the information processing apparatus has been attached to the attachment target, if the password is stored in the storage, the controller changes the password stored in the storage, and if the password is not stored in the storage, the controller stores and sets a new password in the storage.
    Type: Application
    Filed: November 30, 2016
    Publication date: January 23, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tomohiko UKITA, Gen TAKEYAMA, Tetsuhiro KOHADA, Tetsuji FUJISAKI
  • Patent number: 8631286
    Abstract: During initial access in which a control unit 8 accesses a disk device 3 for a first time following execution of a command, the control unit 8 waits for an access response from the disk device 3 until a first timeout value, which is set at a time for completing access to the disk device 3, is counted, and during an access retry subsequent to the initial access, the control unit 8 waits for an access response from the disk device 3 until a second timeout value, which is larger than the first timeout value and set at a time required to specify a source of an access error, is counted.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: January 14, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Tetsuhiro Kohada
  • Publication number: 20120035752
    Abstract: Technical Problem: It is an object of the present invention to provide a data recording device which records a data file in a recording unit at a high speed, and can also restore management data and a data file. Solving means: A writing control unit is provided for writing write data which the writing control unit is requested to write by a file system at a position where the writing control unit is requested to write the write data by the file system when the write data has a data volume equal to or larger than a predetermined value while writing the write data in a region in a recording unit different from that managed by the file system.
    Type: Application
    Filed: July 2, 2009
    Publication date: February 9, 2012
    Inventor: Tetsuhiro Kohada
  • Patent number: 8031567
    Abstract: In a data recording method for a write-once type recording medium capable of pseudo overwrite, it is judged whether data to be recorded in the write-once type recording medium exists. If it is judged that data exists, it is judged that the data is to be recorded from the next writable address (NWA) indicating the boundary between a recorded area and non-recorded area. If it is judged that the data is to be recorded from the next writable address, the data is recorded from the next writable address; and if it is judged that the data is not to be recorded from the next writable address, recording of the data is suspended. While data to be recorded exists, the aforementioned steps are repeated. If no data to be recorded exists, the data whose recording has been suspended is recorded.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: October 4, 2011
    Assignee: Panasonic Corporation
    Inventors: Tetsuhiro Kohada, Katsumi Akagi
  • Publication number: 20110154134
    Abstract: During initial access in which a control unit 8 accesses a disk device 3 for a first time following execution of a command, the control unit 8 waits for an access response from the disk device 3 until a first timeout value, which is set at a time for completing access to the disk device 3, is counted, and during an access retry subsequent to the initial access, the control unit 8 waits for an access response from the disk device 3 until a second timeout value, which is larger than the first timeout value and set at a time required to specify a source of an access error, is counted.
    Type: Application
    Filed: October 8, 2009
    Publication date: June 23, 2011
    Inventor: Tetsuhiro Kohada
  • Publication number: 20100157754
    Abstract: In a data recording method for a write-once type recording medium capable of pseudo overwrite, it is judged whether data to be recorded in the write-once type recording medium exists. If it is judged that data exists, it is judged that the data is to be recorded from the next writable address (NWA) indicating the boundary between a recorded area and non-recorded area. If it is judged that the data is to be recorded from the next writable address, the data is recorded from the next writable address; and if it is judged that the data is not to be recorded from the next writable address, recording of the data is suspended. While data to be recorded exists, the aforementioned steps are repeated. If no data to be recorded exists, the data whose recording has been suspended is recorded.
    Type: Application
    Filed: April 2, 2007
    Publication date: June 24, 2010
    Inventors: Tetsuhiro Kohada, Katsumi Akagi
  • Publication number: 20100131576
    Abstract: Provided is a storage medium on which data is recorded under the industry organization standard, or the format standard complying with the global standard, and a directory and a file can be reproduced from the storage medium based on a virtual root directory, in the method complying with the format standard even though directory management information is broken, by reading data recorded on a disk and setting the highest-order directory in a directory structure, obtained by collecting and analyzing the directory management information, as the virtual root directory.
    Type: Application
    Filed: April 10, 2008
    Publication date: May 27, 2010
    Inventors: Katsumi Akagi, Tetsuhiro Kohada, Hiroyuki Nishino
  • Patent number: 7492683
    Abstract: An information recording method for recording information on a recording medium having a volume space by a system including a drive control unit and a system control unit is disclosed. The method includes notifying the drive control unit by the system control unit of position information, recording information by the drive control unit in the spare area based on the notified position information, generating replacement information by the drive control unit on the position at which the information is recorded in the spare area, and notifying the system control unit of the replacement information, instructing the drive control unit to change management information for managing the information recorded on the recording medium based on the notified replacement information, and changing the management information based on the instruction by the drive control unit.
    Type: Grant
    Filed: June 1, 2004
    Date of Patent: February 17, 2009
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Tetsuhiro Kohada
  • Publication number: 20070028153
    Abstract: An information recording method for recording information on a recording medium having a volume space by a system including a drive control unit and a system control unit includes the steps of: the system control unit notifying the drive control unit of position information indicating a position of a spare area assigned in the volume space; the drive control unit recording information, which is to be recorded in a defective area, in the spare area based on the position information; the drive control unit generating replacement information on the position at which the information is recorded in the spare area, and notifying the system control unit of the replacement information; the system control unit instructing the drive control unit to change management information for managing the information recorded on the recording medium based on the replacement information; and the drive control unit changing the management information based on the instruction.
    Type: Application
    Filed: June 1, 2004
    Publication date: February 1, 2007
    Inventors: Yoshiho Gotoh, Tetsuhiro Kohada