公开(公告)号：US10971177B1

公开(公告)日：2021-04-06

申请号：US16887007

申请日：2020-05-29

Applicant: Seagate Technology LLC

Inventor： James E. Angelo ,  Mehmet Fatih Erden ,  John W. Dykes

IPC: G11B21/02 ,  G11B5/596 ,  G11B5/54 ,  G11B5/48 ,  G11B13/08 ,  G11B5/02 ,  G11B5/00

Abstract: A first heat-assisted magnetic recording (HAMR) writer writes to a surface of a magnetic disk using during an initial time period. A second HAMR writer is configured to write to the surface but not during the initial time period. The initial time period extends from a first time when the disk drive is first used to a second time when a near-field transducer of the first HAMR writer reaches a first wear threshold. During a subsequent time period after the initial time period, to the surface of the disk is written to using the second HAMR writer and not the first HAMR writer.

公开(公告)号：US10931293B1

公开(公告)日：2021-02-23

申请号：US16728919

申请日：2019-12-27

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden

IPC: H03M1/06 ,  H03M1/10

Abstract: Systems and methods are disclosed for improving data channel design by applying transform domain analytics to more reliably extract user data from a signal. In certain embodiments, an apparatus may comprise a channel circuit configured to receive an analog signal at an input of the channel circuit, and sample the analog signal to obtain a set of signal samples. The channel circuit may further apply a filter configured to perform transform domain analysis to the set of signal samples to generate a first subset of samples, the first subset including fewer transitions and having a higher signal to noise ratio (SNR) than the set of signal samples. The channel circuit may detect first bit transform domain representation values from the first subset, and determine channel bit values encoded in the analog signal based on the set of signal samples and using the first bit transform domain representation values detected from the first subset as side information.

公开(公告)号：US20200288140A1

公开(公告)日：2020-09-10

申请号：US16884558

申请日：2020-05-27

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden

IPC: H04N19/137 ,  H04N5/917 ,  H04N19/169 ,  H04N19/63

Abstract: Two or more video signals from two or more sensors are received and discrete wavelet transformations are performed on the two or more video signals. Temporally stationary and non-stationary background data is determined from the discrete wavelet transformations. Redundancies are determined using the temporally stationary background data, the redundancies indicating an overlap between the two or more video signals Data of the two or more video signals is stored without the redundancies to reduce a storage size.

公开(公告)号：US20200154110A1

公开(公告)日：2020-05-14

申请号：US16189018

申请日：2018-11-13

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden

IPC: H04N19/137 ,  H04N19/63 ,  H04N19/169 ,  H04N5/917

Abstract: Two or more video signals are received at respective two or more peer-level storage nodes. Discrete wavelet transformations are performed on the two or more video signals via the two or more peer-level storage nodes. Temporally stationary background data is determined from the discrete wavelet transformations at each of the two or more peer-level storage nodes. Redundancies are determined using the temporally stationary background data, the redundancies indicating an overlap between the two or more video signals. A storage size of two or more video signals is reduced by not storing the redundancies on at least one of the peer-level storage nodes.

公开(公告)号：US20200153800A1

公开(公告)日：2020-05-14

申请号：US16189032

申请日：2018-11-13

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Walter R. Eppler ,  Robert D. Murphy ,  Greg D. Larrew

IPC: H04L29/06 ,  G06F11/10 ,  H04L9/08 ,  G06N20/20

Abstract: One or more networks each include a plurality of sensor nodes operable to communicate public data with each other. Each of the plurality of sensor nodes is operable to gather sensor node data and store the sensor node data locally on the sensor node. Duplicate portions of the sensor node data are distributed to the public data of others of the plurality of sensor nodes via the public data paths for backup storage. The system includes a host that is coupled to individually communicate private data with each of the plurality of sensor nodes. Each of the sensor nodes protects the private data from others of the sensor nodes using distributed key management to ensure distributed encryption.

公开(公告)号：US10482918B1

公开(公告)日：2019-11-19

申请号：US16104332

申请日：2018-08-17

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Stephanie Hernandez ,  Steven Douglas Granz

IPC: G11B5/09 ,  G11B20/10 ,  G11B20/18

Abstract: A set of patterns written to a magnetic recording medium are found that result in a relatively high and/or low error when read back. Upon writing subsequent to the determining of the set of patterns, one pattern of the set of the patterns is identified within a data segment ready to be written to the magnetic recording medium. The data segment is written with a changed bit spacing in response to identifying that the one pattern of the set of the patterns is within the data segment.

公开(公告)号：US10347285B1

公开(公告)日：2019-07-09

申请号：US16006345

申请日：2018-06-12

Applicant: Seagate Technology LLC

Inventor： Steven Douglas Granz ,  Mehmet Fatih Erden

IPC: G11B5/00 ,  G11B20/12

Abstract: Bottom tracks are written to a recording medium using a first setting of a microwave assisted magnetic recording (MAMR) head. Top tracks are interlaced between and partially overlapping the bottom tracks using a second setting of the MAMR head, the second setting resulting in a narrower track width than the first setting.

公开(公告)号：US10311897B1

公开(公告)日：2019-06-04

申请号：US16048768

申请日：2018-07-30

Applicant: Seagate Technology LLC

Inventor： Walter R. Eppler ,  Mehmet Fatih Erden ,  Stephanie Hernandez

IPC: G11B5/00 ,  G11B5/09 ,  G11B20/18 ,  G11B5/48

Abstract: First and second tracks of a magnetic recording medium are read simultaneously via a first reader that provides a first signal based on detecting a total perpendicular field of the first and second tracks. The first and second tracks are read simultaneously via a second reader that provides a second signal based on detecting a total longitudinal field of the first and second tracks. Data is detected from the first and second signals.

公开(公告)号：US10147445B1

公开(公告)日：2018-12-04

申请号：US15824245

申请日：2017-11-28

Applicant: Seagate Technology LLC

Inventor： Bruce Douglas Buch ,  Mark Allen Gaertner ,  Jon D. Trantham ,  Mehmet Fatih Erden

IPC: G11B5/09 ,  G11B5/012 ,  G11B5/82

Abstract: One or more detectors detect data from respective one or more analog sources operable to read from a storage medium. A buffer pool is between the decoders and two or more detectors. The decoders are simultaneously operable, via the buffer pool, to independently decode the data from the one or more detectors.

公开(公告)号：US10043543B1

公开(公告)日：2018-08-07

申请号：US15844767

申请日：2017-12-18

Applicant: Seagate Technology LLC

Inventor： Bruce Douglas Buch ,  Mehmet Fatih Erden

IPC: G11B21/02 ,  G11B5/596

Abstract: In a device with first and second heads, the second head is held at a radial location over one or more disks via a second actuator that moves the second head. A position error of the second head is read while performing a seek with a first actuator, the first actuator moving the first head over the one or more disks. A mechanical transfer function is determined between the first actuator and the second actuator based on the position error of the second head. The mechanical transfer function is used to provide compensation for the second head via the second actuator in response to subsequent seek of the first actuator.