Patents by Inventor Takuji Shimada

Takuji Shimada 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).

  • Method and apparatus for writing servo management information in a disk drive
    Patent number: 7538965
    Abstract: According to one embodiment, in a disk drive having a disk medium on which servo data is recorded, servo-write management information is recorded on the disk medium, in the form of binary data based on the 0 or 180 degrees out of phase pattern composed of the servo burst signals included in the servo data and being out of phase. The disk drive includes a servo-data reproducing unit that reproduces the servo-data and the servo-write management information.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: May 26, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuki Ueda, Yuichi Notake, Masahide Yatsu, Hideo Sado, Seiji Mizukoshi, Takuji Shimada, Takayuki Matsuzaki
  • Method and apparatus for correcting errors while writing spiral servo information in a disk drive
    Patent number: 7457074
    Abstract: According to one embodiment, a servo information writing method for use in a disk drive, for recording the servo information, forming a continuous servo track such as a spiral track. In this servo information writing method, the head is stopped when a write error is detected while the servo information is being written, and the head is then moved again at a constant speed and starts writing the servo information again, at the position where the write error has occurred.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: November 25, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideo Sado, Masahide Yatsu, Yuichi Notake, Seiji Mizukoshi, Takayuki Matsuzaki, Takuji Shimada
  • Method and apparatus for writing servo management information in a disk drive
    Publication number: 20080002278
    Abstract: According to one embodiment, in a disk drive having a disk medium on which servo data is recorded, servo-write management information is recorded on the disk medium, in the form of binary data based on the 0 or 180 degrees out of phase pattern composed of the servo burst signals included in the servo data and being out of phase. The disk drive includes a servo-data reproducing unit that reproduces the servo data and the servo-write management information.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 3, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuki Ueda, Yuichi Notake, Masahide Yatsu, Hideo Sado, Seiji Mizukoshi, Takuji Shimada, Takayuki Matsuzaki
  • Method and apparatus for writing servo information in a disk drive
    Publication number: 20070223131
    Abstract: According to one embodiment, a servo information writing method for use in a disk drive, for recording the servo information, forming a continuous servo track such as a spiral track. In this servo information writing method, the head is stopped when a write error is detected while the servo information is being written, and the head is then moved again at a constant speed and starts writing the servo information again, at the position where the write error has occurred.
    Type: Application
    Filed: March 5, 2007
    Publication date: September 27, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hideo Sado, Yuichi Notake, Masahide Yatsu, Takayuki Matsuzaki, Takuji Shimada, Seiji Mizukoshi