Patents by Inventor Junzou Noda

Junzou Noda 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).

  • Patent number: 7426086
    Abstract: Embodiments of the invention prevent offtrack write that will be caused due to a head vibration in a storage device. In one embodiment, a hard disk drive (HDD) judges approval/disapproval of write of user data to a magnetic disk by using a read signal for user data in addition to servo data in write processing. Thus, a head vibration which cannot be precisely detected based on servo data is detected to prevent off-track write. More specifically, the HDD acquires a read back signal amplitude of a read element with respect to a user data sector within adjacent servo data during a write access phase, and detects a vibration from a maximum value MAX and a minimum value MIN of the read back signal amplitude to judge data write approval/disapproval.
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: September 16, 2008
    Assignee: Hitachi Global Storage Technologies
    Inventors: Atsushi Tobari, Masahide Yamasaki, Masaomi Ikeda, Junzou Noda
  • Publication number: 20070183081
    Abstract: Embodiments in accordance with the present invention increase the possibility that a servo track in which servo data is defective may be detected, greatly decreasing the possibility that a write error may occur during use by a user. According to one embodiment of the present invention, a defective area management method for a data storage device is provided. The data storage device comprises a head in which positions of read and write elements differ from each other in the radial direction of a disk. A defective area management method performs positioning of the head by reading out servo data written on the disk using the read element.
    Type: Application
    Filed: January 5, 2007
    Publication date: August 9, 2007
    Applicant: Hitachi Global Storage Technologies Netherlands B. V.
    Inventors: Junzou Noda, Shingo Hattori, Toshiaki Satoh
  • Publication number: 20070047134
    Abstract: Embodiments of the invention prevent offtrack write that will be caused due to a head vibration in a storage device. In one embodiment, a hard disk drive (HDD) judges approval/disapproval of write of user data to a magnetic disk by using a read signal for user data in addition to servo data in write processing. Thus, a head vibration which cannot be precisely detected based on servo data is detected to prevent off-track write. More specifically, the HDD acquires a read back signal amplitude of a read element with respect to a user data sector within adjacent servo data during a write access phase, and detects a vibration from a maximum value MAX and a minimum value MIN of the read back signal amplitude to judge data write approval/disapproval.
    Type: Application
    Filed: August 23, 2006
    Publication date: March 1, 2007
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Atsushi Tobari, Masahide Yamasaki, Masaomi Ikeda, Junzou Noda