Patents Represented by Attorney Townsend and Townsend and Crwe LLP
  • 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