Patents by Inventor Sadamichi Sone

Sadamichi Sone 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).

  • Recording disk and disk drive
    Patent number: 7724464
    Abstract: Embodiments of the present invention provide a recording disk capable of curtailing the amount of servo data to be stored thereon, and a disk drive. According to one embodiment, servo data area sets each of a first servo data area and plural second servo data areas arranged in that order in a read direction HR are arranged successively on each of tracks of a magnetic disk. Stored in a second sector data section included in the second servo data area is data representing a distance in the read direction HR from the position of the first servo data area to that of the same second servo data area. The amount of data stored in the second sector data section is less than that of data stored in a first sector data section included in the first servo data area.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: May 25, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Masashi Kisaka, Fuminori Sai, Naoyuki Minami, Sadamichi Sone
  • Recording disk and disk drive
    Publication number: 20090086362
    Abstract: Embodiments of the present invention provide a recording disk capable of curtailing the amount of servo data to be stored thereon, and a disk drive. According to one embodiment, servo data area sets each of a first servo data area and plural second servo data areas arranged in that order in a read direction HR are arranged successively on each of tracks of a magnetic disk. Stored in a second sector data section included in the second servo data area is data representing a distance in the read direction HR from the position of the first servo data area to that of the same second servo data area. The amount of data stored in the second sector data section is less than that of data stored in a first sector data section included in the first servo data area.
    Type: Application
    Filed: January 10, 2008
    Publication date: April 2, 2009
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Masashi Kisaka, Fuminori Sai, Naoyuki Minami, Sadamichi Sone