公开(公告)号：US10410662B1

公开(公告)日：2019-09-10

申请号：US16161916

申请日：2018-10-16

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Quan Li ,  Lihong Zhang ,  Chengyi Guo

IPC: G11B5/54 ,  G11B5/60 ,  G11B5/55 ,  G11B5/56 ,  G11B5/00

Abstract: A disc drive includes a data storage surface having a system data zone and a user data zone, and a head that communicates with the data storage surface. The disc drive also includes a control circuit communicatively coupled to the head. The control circuit is configured to, during power up initialization of the disc drive, apply a fly height control value to direct the head to fly at a first target fly height for reading system data from the system data zone. The first target fly height is substantially higher than a second target fly height for reading user data from the user data zone. The control circuit determines whether an actual fly height of the head is substantially equal to the first target fly height. The control circuit performs fly height correction when the actual fly height is not substantially equal to the first target fly height.