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    MAPPING SYSTEM FOR DATA STORAGE DEVICES
    393.
    发明申请
    MAPPING SYSTEM FOR DATA STORAGE DEVICES 审中-公开

    公开(公告)号：US20190114083A1

    公开(公告)日：2019-04-18

    申请号：US15785721

    申请日：2017-10-17

    Applicant: Seagate Technology LLC

    Inventor： Harry Tiotantra ,  Chen Kai ,  Xie WenXiang ,  Shen Feng

    IPC: G06F3/06

    CPC classification number: G06F3/0607 ,  G06F3/0608 ,  G06F3/0644 ,  G06F3/0665 ,  G06F3/067 ,  G06F3/0676 ,  G06F3/0685 ,  G06F3/0689

    Abstract: A method includes generating a map for a storage tier. The map maps a plurality of extents to physical locations on the storage tier and is implemented as a tree with each extent to physical location mapping being one of a plurality of leaf extent nodes of the tree. Individual ones of the plurality of leaf extent nodes are compressed into small extent nodes. Different groups of the small extent nodes are associated with carrier nodes. A command that involves an extent of the plurality of extents, which is represented by a small extent node in one of the carrier nodes, is received from a host. A decompression operation is performed on the small extent node in the carrier node to provide a leaf extent node for the extent associated with the host command. An extent node operation is performed on the leaf extent node for the extent.

    Low density parity check (LDPC) decoder with pre-saturation compensation
    395.
    发明授权
    Low density parity check (LDPC) decoder with pre-saturation compensation 有权

    公开(公告)号：US10263640B2

    公开(公告)日：2019-04-16

    申请号：US15478895

    申请日：2017-04-04

    Applicant: Seagate Technology LLC

    Inventor： Ivana Djurdjevic ,  Ara Patapoutian ,  Zheng Wang ,  AbdelHakim Alhussien ,  Sundararajan Sankaranarayanan ,  Ludovic Danjean ,  Erich F. Haratsch

    IPC: H03M13/11

    Abstract: Method and apparatus for decoding data. In some embodiments, an LDPC decoder has a variable node circuit (VNC) with a plurality of variable nodes configured to store bit reliability values of m-bit code bits. A check node circuit (CNC) has a plurality of check nodes configured to perform parity check operations upon n-bit messages from the VNC. Each n-bit message is formed from a combination of the bit reliability values and stored messages from the check nodes. A pre-saturation compensation circuit is configured to maintain a magnitude of each n-bit message received by the CNC below a saturation limit comprising the maximum value that can be expressed using p bits, with p less than n and each of the n-bit messages received by the CNC having a different magnitude. The pre-saturation compensation circuit may apply different scaling and/or bias factors to the n-bit messages over different decoding iterations.

    Media storage areal density
    396.
    发明授权
    Media storage areal density 有权

    公开(公告)号：US10255945B1

    公开(公告)日：2019-04-09

    申请号：US15945555

    申请日：2018-04-04

    Applicant: Seagate Technology LLC

    Inventor： Mehmet Fatih Erden ,  Steven Douglas Granz ,  Peter S. Harllee ,  Stephanie Hernandez ,  Walter R. Eppler

    IPC: G11B20/12

    Abstract: In one implementation, the disclosure provides a method comprising detecting one or more areas of a storage medium having a data pattern with a plurality of consecutive bits, where the consecutive bits have the same polarity. The method further comprises encoding additional information on a section of the one or more detected areas, where the section of the one or more detected areas has a signal to noise ratio (SNR) higher than SNR of the other areas of the storage media.

    Read-after-write methodology using multiple actuators moveable over the same magnetic recording disk surface
    399.
    发明授权
    Read-after-write methodology using multiple actuators moveable over the same magnetic recording disk surface 有权

    公开(公告)号：US10249339B1

    公开(公告)日：2019-04-02

    申请号：US16020501

    申请日：2018-06-27

    Applicant: Seagate Technology LLC

    Inventor： Riyan Mendonsa ,  Jason Bryce Gadbois ,  Mark Allen Gaertner ,  Guy T. Lawrence ,  Bruce Douglas Buch

    IPC: G11B27/36 ,  G11B21/08 ,  G11B5/012

    Abstract: One or more magnetic recording disks are coupled to a spindle motor, each of the disks having opposing recording surfaces. Two or more actuators are moveable independently over at least a first recording surface of the one or more disks. A first actuator of the two or more actuators comprises a first write head and a first read head. A second actuator of the two or more actuators comprises at least a second read head and may include a second write head. A controller is coupled to the two or more actuators and configured to write data to a track on the first recording surface using the first write head, and perform a read operation on the data written to the track using the second read head. The controller is also configured to verify that the data was successfully written to the track in response to the read operation. The read operation can be performed within less than one revolution of the first recording surface after the write operation.

    Shingled magnetic recording storage system during vibration
    400.
    发明授权
    Shingled magnetic recording storage system during vibration 有权

    公开(公告)号：US10249338B2

    公开(公告)日：2019-04-02

    申请号：US15952754

    申请日：2018-04-13

    Applicant: Seagate Technology LLC

    Inventor： Jian Qiang ,  Xiong Liu

    IPC: G11B20/12 ,  G11B27/36 ,  G11B20/18 ,  G11B20/10

    Abstract: The disclosed technology provides a method that improves SMR throughput in vibration in storage systems. In one implementation, the method comprises receiving a write command to write data on a first track in a band of a storage medium, performing a vibration detection scheme to identify vibration events, determining if a number of vibration events is above a predetermined threshold, skipping the first track responsive to determining the number of vibration events is above a predetermined threshold, seeking to a second track adjacent to the first track, increasing an OCLIM on the second track adjacent to the first track from a default OCLIM to an increased OCLIM, and shifting the writer center on the second track adjacent to the first track.

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