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    Laser current calibration using preamplifier
    1.
    发明授权
    Laser current calibration using preamplifier 有权

    公开(公告)号：US10152997B1

    公开(公告)日：2018-12-11

    申请号：US15660832

    申请日：2017-07-26

    Applicant: Seagate Technology LLC

    Inventor： Alfredo Sam Chu ,  Todd Michael Lammers ,  Thomas Lee Schick ,  Robert Matousek

    IPC: G11B5/09 ,  G11B20/10 ,  G11B5/60

    Abstract: Systems and methods of laser bias calibration are presented. A preamplifier circuit may configure a laser current supplied to a laser emitter to be a first laser current of the plurality of laser currents during the writing of one or more first sectors. The preamplifier may further detect one or more gaps in a write power signal while the laser current of the laser emitter is configured to be the first laser current. In response to the detection of the one or more gaps in the write power signal, the preamplifier may configure the laser current supplied to the laser emitter to be a second laser current of the plurality of laser currents during the writing of one or more second sectors. The preamplifier circuit may be utilized in a heat assisted magnetic recording device.

    Laser boost and duration optimization
    4.
    发明授权
    Laser boost and duration optimization 有权

    公开(公告)号：US10657987B1

    公开(公告)日：2020-05-19

    申请号：US16207912

    申请日：2018-12-03

    Applicant: Seagate Technology LLC

    Inventor： Alfredo Sam Chu ,  Franklin P. Martens ,  Aaron Jacobs

    IPC: G11B5/012 ,  G11B5/455 ,  G11B5/00

    Abstract: This disclosure is related to systems, devices, processes, and methods to optimize a laser power boost amplitude, a laser power boost duration, or both in a heat-assisted data recording device, such as in heat-assisted magnetic recording (HAMR). The amplitude and duration for the laser power boost may be determined for a specific portion of a write operation, such as a first sector of the write operation. During operation of a data storage device, the laser power boost may provide additional power to the laser for the specific portion. Once the laser power boost duration has elapsed, the data storage device may continue providing power to the laser at the normal power input range of the laser. The laser power boost settings may be determined on a per head per zone basis, per track basis, or another configuration.

    Laser mode hopping detection in a heat-assisted magnetic recording drive
    6.
    发明授权
    Laser mode hopping detection in a heat-assisted magnetic recording drive 有权
    激光模式跳频检测在热辅助磁记录驱动

    公开(公告)号：US09595288B1

    公开(公告)日：2017-03-14

    申请号：US15155973

    申请日：2016-05-16

    Applicant: Seagate Technology LLC

    Inventor： Alfredo Sam Chu ,  Pu-Ling Lu ,  Franklin P. Martens ,  John W. Dykes

    IPC: G11B27/36 ,  G11B7/1267 ,  G11B5/00

    CPC classification number: G11B7/1267 ,  G11B5/02 ,  G11B5/40 ,  G11B5/455 ,  G11B2005/0021

    Abstract: A method comprises performing a write operation using a heat-assisted magnetic recording (HAMR) drive operating at a plurality of temperatures. The method involves measuring a metric of write performance subsequent to the write operation at each of the operating temperatures. The method also involves detecting one or more laser mode hops using the metrics, and determining a temperature at which each of the detected mode hops occurred. The method further involves storing the temperature for each detected mode hop in a non-volatile memory of the drive. The method may involve mitigating laser mode hopping, such as by the drive avoiding the stored temperature(s).

    Abstract translation: 一种方法包括使用在多个温度下操作的热辅助磁记录（HAMR）驱动来执行写入操作。 该方法包括测量在每个工作温度下的写入操作之后的写入性能的度量。 该方法还涉及使用度量来检测一个或多个激光模式跳跃，并且确定每个检测到的模式跳跃发生的温度。 该方法还包括将每个检测到的模式跳跃的温度存储在驱动器的非易失性存储器中。 该方法可以包括减轻激光模式跳频，例如通过驱动器避免存储的温度。

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