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    Write signal adjustment
    2.
    发明授权
    Write signal adjustment 有权

    公开(公告)号：US09779763B1

    公开(公告)日：2017-10-03

    申请号：US15142766

    申请日：2016-04-29

    Applicant: Seagate Technology LLC

    Inventor： Todd M. Lammers

    IPC: G11B5/02 ,  G11B27/36 ,  G11B5/09

    CPC classification number: G11B5/02 ,  G11B2005/001

    Abstract: A write signal may be adjusted, or modified, based on one or more read signals acquired, or read from, one or more portions proximate a target portion on a storage medium where the write signal is to be applied. The one or more read signals may be read from the storage medium in response to receiving a write data unit such that the read signals may not need to be buffered or later clock synchronized to the write signal.

    Chirped current profile with undershoot feature
    4.
    发明授权
    Chirped current profile with undershoot feature 有权

    公开(公告)号：US10210887B1

    公开(公告)日：2019-02-19

    申请号：US15956901

    申请日：2018-04-19

    Applicant: SEAGATE TECHNOLOGY LLC

    Inventor： Kirill A. Rivkin ,  Mourad Benakli ,  Todd M. Lammers ,  Ralph William Cross

    IPC: G11B5/09 ,  G11B5/012 ,  G11B20/10

    Abstract: Systems and methods for a providing a chirped current profile with an undershoot for a channel preamplifier are described. A method for writing bits in a magnetic recording disc may include applying an overshoot to a write current which is supplied to a magnetic writer of the magnetic recording disc and applying an undershoot to the write current after the overshoot is applied to at least partially de-saturate the magnetic writer. The method may also include writing a bit to the magnetic recording disc with the magnetic writer using the supplied write current. In some examples, the application of a short negative pulse after an overshoot portion of the write current waveform is delivered to the head during a write operation that writes the bit to the magnetic recording disc.

    Flexible dynamic loop with back-side impedance control structures
    5.
    发明授权
    Flexible dynamic loop with back-side impedance control structures 有权

    公开(公告)号：US09747934B1

    公开(公告)日：2017-08-29

    申请号：US15264387

    申请日：2016-09-13

    Applicant: SEAGATE TECHNOLOGY LLC

    Inventor： Todd M. Lammers ,  Andrew R. Motzko ,  Chau Chin Low ,  Matthew S. Graeff

    IPC: G11B5/48 ,  G11B5/09

    CPC classification number: G11B5/4846 ,  G11B5/09 ,  H05K1/0227 ,  H05K1/0245 ,  H05K1/0253 ,  H05K2201/09727

    Abstract: Systems and methods for a flexible dynamic loop having reduced impedance are described. The flexible dynamic loop may supply current from a preamplifier to another device, such as a hard disk drive. In one embodiment, a flexible dynamic loop comprises a flexible structure having a set of wire traces. The flexible dynamic loop may also comprise a set of impedance control structures on the flexible structure and perpendicular to a bend radius of the flexible structure, wherein the set of impedance control structures change an impedance level experienced by at least some of the set of wire traces. Some of the impedance control structures may be staggered. The flexible dynamic loop may also include a cover layer formed over the set of impedance control structures, which may be patterned with perforations. The flexible dynamic loop may also include one or more flexible rails connecting some of the impedance control structures.

    Chirped current profile with undershoot feature
    6.
    发明授权
    Chirped current profile with undershoot feature 有权

    公开(公告)号：US09978401B1

    公开(公告)日：2018-05-22

    申请号：US15497473

    申请日：2017-04-26

    Applicant: SEAGATE TECHNOLOGY LLC

    Inventor： Kirill A. Rivkin ,  Mourad Benakli ,  Todd M. Lammers ,  Ralph William Cross

    IPC: G11B5/02 ,  G11B5/09 ,  G11B5/012 ,  G11B20/10

    CPC classification number: G11B5/09 ,  G11B5/012 ,  G11B20/10009 ,  G11B20/10018

    Abstract: Systems and methods for a providing a chirped current profile with an undershoot for a channel preamplifier are described. A method for writing bits in a magnetic recording disc may include applying an overshoot to a write current which is supplied to a magnetic writer of the magnetic recording disc and applying an undershoot to the write current after the overshoot is applied to at least partially de-saturate the magnetic writer. The method may also include writing a bit to the magnetic recording disc with the magnetic writer using the supplied write current. In some examples, the application of a short negative pulse after an overshoot portion of the write current waveform is delivered to the head during a write operation that writes the bit to the magnetic recording disc.

    Storage device with adaptive voltage generation system
    7.
    发明授权
    Storage device with adaptive voltage generation system 有权
    具有自适应电压发生系统的存储装置

    公开(公告)号：US09530438B1

    公开(公告)日：2016-12-27

    申请号：US15005633

    申请日：2016-01-25

    Applicant: Seagate Technology LLC

    Inventor： Jon D. Trantham ,  Todd M. Lammers

    IPC: G11B5/00 ,  G11B5/09 ,  G11B5/02 ,  G11B5/48

    CPC classification number: G11B5/09 ,  G11B5/02 ,  G11B5/4853 ,  G11B19/046 ,  G11B2005/0021 ,  G11B2005/0024

    Abstract: Apparatus and method for generating supply voltages in a data storage device. In some embodiments, the apparatus includes a data transducer adjacent a rotatable magnetic recording medium, the data transducer having a write coil and an electromagnetic source for thermally assisted recording by the write coil. A preamplifier/driver circuit (preamp) has a write driver adapted to supply write currents to the write coil and a source driver adapted to supply source voltage to the electromagnetic source. A voltage regulation circuit applies a first positive supply voltage to the write driver and a different, second positive supply voltage to the source driver.

    Abstract translation: 一种用于在数据存储装置中产生电源电压的装置和方法。 在一些实施例中，该装置包括邻近可旋转磁记录介质的数据传感器，数据传感器具有写入线圈和用于通过写入线圈进行热辅助记录的电磁源。 前置放大器/驱动器电路（前置放大器）具有适于向写入线圈提供写入电流的写入驱动器和适于将电源电压提供给电磁源的源极驱动器。 电压调节电路向写驱动器施加第一正电源电压，向源极驱动器施加不同的第二正电源电压。

    HAMR DRIVE FAULT DETECTION SYSTEM
    9.
    发明申请
    HAMR DRIVE FAULT DETECTION SYSTEM 有权
    HAMR驱动故障检测系统

    公开(公告)号：US20150279430A1

    公开(公告)日：2015-10-01

    申请号：US14230367

    申请日：2014-03-31

    Applicant: Seagate Technology LLC

    Inventor： Jon D. Trantham ,  Robert Matousek ,  Todd M. Lammers

    IPC: G11B27/36 ,  G11B5/48

    CPC classification number: G11B27/36 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6088 ,  G11B11/10504 ,  G11B11/10506 ,  G11B13/04 ,  G11B13/08 ,  G11B2005/0021

    Abstract: A data storage apparatus includes a controller capable of being coupled to a read/write head. The controller is configured to receive a fault signal from a sensor of the read/write head. The sensor indicates whether an energy source used to heat the recording medium is malfunctioning during a write operation. In response to the fault signal, the controller takes remedial action to protect the data associated with the write operation.

    Abstract translation: 数据存储装置包括能够耦合到读/写头的控制器。 控制器被配置为从读/写头的传感器接收故障信号。 传感器指示在写入操作期间用于加热记录介质的能量源是否发生故障。 响应于故障信号，控制器采取补救措施来保护与写操作相关的数据。

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