Patents Assigned to Hitachi Global Storages Technologies Nethlands B.V.
  • Method for controlling air pressure in an evacuated disk drive
    Patent number: 6700726
    Abstract: A disk drive controller controls a vacuum pump to establish a vacuum within a disk drive housing to conserve power while ensuring that the head of the drive does not crash into the disk. The controller compares actual spindle power to a predetermined maximum power threshold and actual fly height to a calibration fly height to control the pump. The calibration values are derived by comparing no-load and loaded values for a parameter, e.g., error rate, disk temperature, and so on.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: March 2, 2004
    Assignee: Hitachi Global Storages Technologies Nethlands B.V.
    Inventors: Donald Ray Gillis, Bernd Lamberts, Kris Victor Schouterden