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23 条记录 (耗时 0.017 秒)

    Full disk serpentine write path for tamper-proof disk drive
    1.
    发明授权
    Full disk serpentine write path for tamper-proof disk drive 有权

    公开(公告)号：US11934687B2

    公开(公告)日：2024-03-19

    申请号：US17743386

    申请日：2022-05-12

    申请人： Western Digital Technologies, Inc.

    发明人： Erhard Schreck ,  Sukumar Rajauria ,  Robert Smith

    IPC分类号： G06F3/06

    CPC分类号： G06F3/0655 ,  G06F3/0604 ,  G06F3/0676

    摘要： The present disclosure generally relates to a multi-disk drive comprising a plurality of media surfaces and a plurality of heads, wherein a head of the plurality of heads is configured to be actuated over each surface of the plurality of media surfaces. The multi-disk drive further comprises control circuitry configured to write data to a first media surface of the plurality of media surfaces using a first head of the plurality of heads, and after all of an available memory of the first media surface has been filled, write data to a second media surface of the plurality of media surfaces using a second head of the plurality of heads. The control circuitry is further configured to permanently disable write access to one or more media surfaces of the plurality of media surfaces, while continuing to permit read access to the plurality of media surfaces.

    Data timestamp and read counter for magnetic recording devices
    2.
    发明授权
    Data timestamp and read counter for magnetic recording devices 有权

    公开(公告)号：US11694722B1

    公开(公告)日：2023-07-04

    申请号：US17651100

    申请日：2022-02-15

    申请人： Western Digital Technologies, Inc.

    发明人： Shaomin Xiong ,  Erhard Schreck ,  Robert Smith ,  Sukumar Rajauria

    IPC分类号： G11B27/36 ,  G11B20/18 ,  G11B21/10

    CPC分类号： G11B21/106

    摘要： The present disclosure generally relates to using a data timestamp and/or a read counter to prevent data from being re-read and signal that the data has been accessed. The write assist element in the write head can be utilized to degrade the data or an allocated marker after the data has been read. The degradation functions as a read counter to indicate how many times the data has been read. Additionally and/or alternatively, a timestamp can be utilized. The timestamp is updated each time that the data has been accessed. In so doing, it is possible to determine whether data in a data storage device has been accessed.

    Data storage device detecting write pole degradation for magnetic write head
    3.
    发明授权
    Data storage device detecting write pole degradation for magnetic write head 有权

    公开(公告)号：US11423939B1

    公开(公告)日：2022-08-23

    申请号：US17176302

    申请日：2021-02-16

    申请人： Western Digital Technologies, Inc.

    发明人： Pierre-Olivier Jubert ,  Sukumar Rajauria

    IPC分类号： G11B21/02 ,  G11B5/127

    摘要： A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil and a write pole. A test pattern is written to the magnetic media by applying a first current to the write coil. A second current is applied to the write coil while the head passes over the test pattern, wherein the second current has a polarity opposite the first current. After applying the second current to the write coil while the head passes over the test pattern, the test pattern is read from the magnetic media using the head to generate a first read signal, and a first noise power of the first read signal is measured. A degradation of the write pole is detected based on the first noise power measurement.