Patent ID: 6597530
Filing Date: 2003-07-22
Classification: G11B

Abstract:
A seek control device for positioning a read/write head at a track on a disk-shaped recording medium provided with a plurality of concentric tracks on which a servo pattern is recorded for the purpose of tracking control, said seek control comprising:a position detection module for outputing a position detection signal having a nonlinear characteristic with respect to a displacement of said read/write head in a track, after reading said servo pattern; a position control module for moving said read/write head to a target position based upon said position detection signal; and a seek completion detection module having means for detecting a current position of a read/write head of said magnetic recording device using a position error signal (PES) during a seek operation; means for determining whether a variance rate of said PES consecutively falls within an acceptable Cr range from a target position of said seek operation for a first predetermined number of times; means for determining whether said variance rate of said PES consecutively falls within an acceptable Cw range from said target position of said seek operation for a second predetermined number of times, wherein said Cw range is narrower than said Cr range, in response to a determination that said variance rate of said PES consecutively falls within said acceptable Cr range from said target position of said seek operation for said first predetermined number of times; means for calculating a speculated PES value and means for determining whether said speculated PES value falls within a Cwâ€² range from said target position of said seek operation, in response to a determination that said variance rate of said PES consecutively falls within said acceptable Cw range from said target position of said seek operation for said second predetermined number of times, wherein said Cwâ€² range is narrower than said Cw range; and means for issuing a seek complete command, in response to a determination that said speculated PES value falls within said Cwâ€² range from said target position of said seek operation.