公开(公告)号：US09230605B1

公开(公告)日：2016-01-05

申请号：US14556645

申请日：2014-12-01

Applicant: Western Digital Technologies, Inc.

Inventor： Andreas Moser ,  Thien Nguyen

IPC: G11B7/00 ,  G11B27/36 ,  G11B5/09

CPC classification number: G11B27/36 ,  G11B5/012 ,  G11B5/02 ,  G11B20/10009 ,  G11B20/10305 ,  G11B20/10481

Abstract: A data storage device is disclosed comprising a head actuated over a disk. Data is written to the disk and read from the disk to measure a quality metric. A recording parameter is repeatedly adjusted and the quality metric is measured for each adjustment of the recording parameter. An operating value for the recording parameter is selected that corresponds to a substantially maximum areal density for the disk when the measured quality metric substantially matches a target quality metric.

Abstract translation: 公开了一种数据存储装置，包括在盘上致动的磁头。 数据写入磁盘并从磁盘读取以测量质量度量。 重复调整记录参数，并对记录参数的每次调整测量质量度量。 当测量的质量度量基本上与目标质量度量匹配时，选择对应于盘的基本最大面密度的记录参数的操作值。

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.