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    Selective sampling for data recovery
    21.
    发明授权
    Selective sampling for data recovery 有权

    公开(公告)号：US10719392B1

    公开(公告)日：2020-07-21

    申请号：US16020013

    申请日：2018-06-27

    Applicant: Seagate Technology LLC

    Inventor： Deepak Sridhara ,  Ara Patapoutian

    IPC: G06F11/10 ,  G06F11/14 ,  G11B5/012 ,  G11B20/12

    Abstract: Systems and methods are disclosed for error recovery in a digital data channel. In an error recovery approach when the hardware fails to recover a sector, the sample for that sector can be saved along with a metric measure that indicates the quality of the sample. This process can begin from a first on-the-fly receiving and decoding of data. During each step of error recovery, a retry attempt may either use samples obtained during a new decoding attempt or may use a sample, or a combination of samples, having the best metric from an earlier attempt, or a combination of earlier attempts, to perform the recovery during a current retry recovery attempt.

    NON-LINEAR LLR LOOK-UP TABLES
    22.
    发明申请
    NON-LINEAR LLR LOOK-UP TABLES 审中-公开

    公开(公告)号：US20200212939A1

    公开(公告)日：2020-07-02

    申请号：US16233555

    申请日：2018-12-27

    Applicant: Seagate Technology LLC

    Inventor： Deepak Sridhara ,  Rishi Ahuja ,  William M. Radich ,  Ara Patapoutian

    IPC: H03M13/45 ,  H03M13/11

    Abstract: In one implementation, the disclosure provides a system including a detector configured to generate an output of a first log-likelihood ratio for each bit in an input data stream. The system also includes at least one look-up table providing a mapping of the first log-likelihood ratio to a second log-likelihood ratio. The mapping between the first log-likelihood ratio and the second log-likelihood ratio is non-linear. The system also includes a decoder configured to generate an output data stream using the second log-likelihood ratio to generate a value for each bit in the input data stream.

    Minimizing reads for reallocated sectors
    24.
    发明授权
    Minimizing reads for reallocated sectors 有权

    公开(公告)号：US10379972B1

    公开(公告)日：2019-08-13

    申请号：US15341621

    申请日：2016-11-02

    Applicant: Seagate Technology LLC

    Inventor： Deepak Sridhara ,  Ara Patapoutian ,  Prafulla B Reddy

    IPC: G06F11/00 ,  G06F11/16 ,  G06F11/10 ,  H03M13/15 ,  H03M13/19

    Abstract: Systems and methods are disclosed for minimizing reads for reallocated sectors of a data storage medium. An apparatus may be configured to selectively skip over reallocated sectors in an LBA range without interrupting a read, via generating a skip mask or by beginning the read after the reallocated sector and reading the entire track up to the reallocated sector. When a number of sectors not read from the LBA range during the read operation is less than an amount of sectors that can be recovered based on an error correction capability, the data of the reallocated sector may be reconstructed using error correction data rather than by performing a read at the reallocated sector.

    Unequal error correction code in multi-track recording
    25.
    发明授权
    Unequal error correction code in multi-track recording 有权

    公开(公告)号：US09837115B1

    公开(公告)日：2017-12-05

    申请号：US15339189

    申请日：2016-10-31

    Applicant: Seagate Technology LLC

    Inventor： Deepak Sridhara ,  William M Radich

    IPC: G11B5/09 ,  G11B20/10 ,  G11B20/24

    CPC classification number: G11B5/09 ,  G11B5/012 ,  G11B20/1833 ,  G11B2020/1222

    Abstract: Systems and methods are disclosed for implementing unequal error correction code (ECC) in multi-track recording. A device may comprise a circuit configured to implement an error correction coding scheme applying different code rate error correction codes on adjacent tracks within a same recording zone. The circuit may perform a read operation, including simultaneously detecting bits from a first track and a second track of the adjacent tracks, iteratively applying detected bits from the first track to perform adjacent track interference cancellation (ATIC) to decode bits from the second track, and iteratively applying detected bits from the second track to perform ATIC to decode bits from the first track.

    Digital communications channel
    26.
    发明授权
    Digital communications channel 有权
    数字通信通道

    公开(公告)号：US09362954B1

    公开(公告)日：2016-06-07

    申请号：US14026423

    申请日：2013-09-13

    Applicant: Seagate Technology LLC

    Inventor： Deepak Sridhara ,  Ara Patapoutian

    IPC: G06F11/00 ,  H04R3/00 ,  H03M13/27

    CPC classification number: H03M13/1111 ,  H03M13/2957 ,  H03M13/356 ,  H03M13/6325

    Abstract: Encoding and decoding schemes are presented with various configurations for error correcting code (ECC) encoders and decoders. Bits from encoders can be interleaved before they are transmitted to the communications medium. During receiving, or read back, stronger, converged ECC decoders can help with weaker decoders through detector iterations. Variations of iterative detector-decoders are described.

    Abstract translation: 编码和解码方案具有用于纠错码（ECC）编码器和解码器的各种配置。 来自编码器的位可以在被传送到通信介质之前进行交织。 在接收或读回时，更强大的融合ECC解码器可以通过检测器迭代来帮助解码器较弱。 描述了迭代检测器 - 解码器的变化。

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