公开(公告)号：US11276432B1

公开(公告)日：2022-03-15

申请号：US17176354

申请日：2021-02-16

Applicant: Western Digital Technologies, Inc.

Inventor： Pierre-Olivier Jubert ,  Andreas Moser ,  Daniel S. Wolf ,  Toan Tang ,  Thien Nguyen ,  Harold H. Gee

IPC: G11B27/36 ,  G11B20/18 ,  G11B20/10 ,  G11B5/40 ,  G11B5/02 ,  G11B5/00

Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil, a laser configured to heat the magnetic media during a write operation, and a read element. A test pattern is written to the magnetic media by applying a current to the write coil and a first bias to the laser. A second bias is applied to the laser while the head passes over the test pattern, and then the test pattern is read from the magnetic media using the head to generate a first read signal. A first noise power of the first read signal is measured, and at least one parameter of a noise power function is generated based on the first noise power measurement, wherein the noise power function is a function of at least the bias applied to the laser.