Patents by Inventor Krishnan Subramanian

Krishnan Subramanian has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11449238
    Abstract: A data storage system can provide low cost and optimized performance with a cartridge housing multiple separate data storage devices and each of the data storage devices being concurrently engaged by a device player. The device player may have a processor configured to analyze mechanical performance of each data storage device and data performance of data resident in each data storage device.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: September 20, 2022
    Inventors: Riyan A. Mendonsa, Brett R. Herdendorf, Jon D. Trantham, Krishnan Subramanian, John E. Moon, Hemant Mane
  • Publication number: 20220293131
    Abstract: A data storage system include a disk drive having a rotating ramp assembly that may be moved between an engaged and disengaged position. The rotating ramp assembly may include a ramp extension that is not disposed in overlapping relation to a data storage disk location in the drive when in the disengaged position. However, in the engaged position, the ramp extension may overhang a portion of the data storage disk location. In turn, the head extension may include a ramp surface that allows a head assembly to move to a head parking surface when the rotating ramp assembly is in the engaged position. IN turn, the rotating ramp assembly may be rotated while maintaining the head assembly on the head parking surface, which may be arcuate and extend about at least a portion of the rotating ramp assembly.
    Type: Application
    Filed: March 9, 2021
    Publication date: September 15, 2022
    Inventors: Brett R. HERDENDORF, Riyan Alex MENDONSA, Krishnan SUBRAMANIAN
  • Patent number: 11443775
    Abstract: An issue facing shared read/write player hard disc drives (HDDs) is when a head-media contact event occurs, any resulting plume of debris caused by the contact event not only affects the magnetic disc currently being read or written, but other magnetic discs within the HDD enclosure. The presently disclosed technology is directed as mitigating the potential consequences of such a head-media contact event. By providing one or more internal access doors within the HDD, a magnetic disc currently being read from or written to may be physically isolated from other magnetic discs within the HDD. As a result, in the event of a head-media contact event, any resulting plume of debris caused by the contact event only affects the magnetic disc currently being read or written. The remaining magnetic discs within the HDD are isolated from the plume of debris.
    Type: Grant
    Filed: April 20, 2021
    Date of Patent: September 13, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Brett R. Herdendorf, Riyan Alex Mendonsa, Krishnan Subramanian
  • Publication number: 20220276354
    Abstract: An apparatus includes a detector, a light source configured to emit light, a reflecting apparatus having multiple reflective facets, and a mirror. The reflecting apparatus is configured to rotate around an axis and arranged to reflect the emitted light from the light source and reflect backscattered light. The mirror is arranged to reflect the backscattered light from the reflecting apparatus towards the detector.
    Type: Application
    Filed: May 18, 2022
    Publication date: September 1, 2022
    Inventors: Kevin A. Gomez, Zoran Jandric, Krishnan Subramanian, Pierre Asselin, Dan Mohr, Raghu Ambekar Ramachan Rao
  • Publication number: 20220238137
    Abstract: A data storage device includes a ramp configured to support at least one head in the data storage device, and a movement mechanism coupled to the ramp and configured to move the ramp from a first position to a second position by at least one of expansion or contraction of at least a portion of the movement mechanism. The data storage device further includes a ramp motion control module operably coupled to the movement mechanism. The ramp motion control module is configured to provide the movement mechanism with a first control signal that causes the movement mechanism to move the ramp from the first position to the second position. The data storage device additionally includes a latch configured to hold the ramp.
    Type: Application
    Filed: April 15, 2022
    Publication date: July 28, 2022
    Inventors: Brett R. Herdendorf, Riyan Alex Mendonsa, Krishnan Subramanian
  • Patent number: 11391822
    Abstract: An apparatus includes a detector, a light source configured to emit light, a reflecting apparatus having multiple reflective facets, and a mirror. The reflecting apparatus is configured to rotate around an axis and arranged to reflect the emitted light from the light source and reflect backscattered light. The mirror is arranged to reflect the backscattered light from the reflecting apparatus towards the detector.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: July 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Kevin A Gomez, Zoran Jandric, Krishnan Subramanian, Pierre Asselin, Dan Mohr, Raghu Ambekar Ramachandra Rao
  • Publication number: 20220213876
    Abstract: A device disclosed herein includes an upper shape memory alloy (SMA) wire, a lower SMA wire, a flexure having an opening, and a spring configured within the flexure opening, wherein the lower SMA wire, and the flexure are attached at one end to an anchor and at another end to a pin.
    Type: Application
    Filed: January 5, 2022
    Publication date: July 7, 2022
    Inventors: Brett R. HERDENDORF, Riyan Alex MENDONSA, Krishnan SUBRAMANIAN
  • Publication number: 20220201884
    Abstract: An apparatus with a housing which stores a plurality of data storage magazines where each data storage magazine includes a plurality of data storage devices. The housing includes a movable carriage configured to selectively couple a set of data storage devices held by a particular data storage magazine to a host device. The housing also includes a physical locking mechanism configured to selectively prevent data storage devices from coupling to the host device.
    Type: Application
    Filed: December 21, 2020
    Publication date: June 23, 2022
    Applicant: Seagate Technology LLC
    Inventors: Brett Herdendorf, Riyan Mendonsa, Krishnan Subramanian
  • Patent number: 11367464
    Abstract: An apparatus with a housing which stores a plurality of data storage magazines, where each data storage magazine includes a plurality of data storage devices. The housing includes a movable carriage, the movable carriage configured to selectively couple a set of data storage devices held by a particular data storage magazine to a host device. The housing also includes a motor configured to move the movable carriage within the housing to enable the movable carriage to communicatively couple the set of data storage devices held by the particular data storage magazine to the host device.
    Type: Grant
    Filed: October 13, 2020
    Date of Patent: June 21, 2022
    Assignee: SEAGATE TECHNOLOGY, LLC
    Inventors: Brett Herdendorf, Riyan Mendonsa, Krishnan Subramanian
  • Patent number: 11361787
    Abstract: A data storage device includes a stack of a plurality of disks, first and second arms, first and second heads, first and second linear drivers and an elevator. Each of the plurality of disks includes a read/write surface. The first arm has a first head end that is movable relative to the stack. The first head is configured to interact with a selected one of the read/write surfaces. The first linear driver is configured to move the first arm along a first straight line in a x-y plane defined by the one of the read/write surfaces. The elevator is configured to move the first arm in a z direction. The second arm has a second head end that is movable relative to the stack and supports the second head. The second linear driver is configured to move the second arm along a second straight line in the x-y plane.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: June 14, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Riyan Alex Mendonsa, Brett R. Herdendorf, Gordon A. Harwood, Krishnan Subramanian
  • Publication number: 20220173539
    Abstract: Connector devices or connectors for use in interconnection to a circuit board may be configured in an open or closed configuration. The connectors devices may utilize a shape memory alloy (SMA) actuator to move clamping portions with respect to each other into one or both of the open or closed positions.
    Type: Application
    Filed: December 1, 2020
    Publication date: June 2, 2022
    Inventors: Brett R. Herdendorf, Riyan Alex Mendonsa, Wolfgang Rosner, Krishnan Subramanian
  • Patent number: 11348610
    Abstract: A data storage device includes at least one data storage disc, at least one head supported by a rotatable actuator arm, an elevator configured to move the rotatable actuator arm in a z direction, a first vertical guide post, a ramp assembly configured to support the head on a movable ramp, and a bracket attached to the movable ramp. The at least one head is configured to communicate with the at least one data storage disc when positioned over the at least one data storage disc. The movable ramp is moveable in a z direction parallel to the first vertical guide post. The bracket is engageable to the rotatable actuator arm so that the bracket moves along the first vertical guide post in unison with z direction motion of the rotatable actuator arm via the elevator, and the bracket is disengageable from the rotatable actuator arm.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: May 31, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Brett R. Herdendorf, Riyan Alex Mendonsa, Wolfgang Rosner, Steven L. Weber, Krishnan Subramanian, Edward Charles Gage
  • Patent number: 11348611
    Abstract: In one aspect, a data storage device includes a disc, an arm, a head, a linear driver, and an elevator. The disc has a read/write surface defining an x-y plane. The arm has a head end that is movable relative to the disc. The head is configured to interact with the read/write surface. The linear driver is configured to move the arm along a substantially straight line in the x-y plane. The elevator is configured to move the arm in a z direction. In another aspect, rather than a linear driver, the data storage device includes a rotary actuator and a pivot actuator. The arm includes a first portion and a load beam. The rotary actuator is configured to move the first portion about a first pivot axis; the pivot actuator is configured to move the load beam about a second pivot axis relative to the first portion.
    Type: Grant
    Filed: April 19, 2021
    Date of Patent: May 31, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Riyan Alex Mendonsa, Brett R Herdendorf, Krishnan Subramanian
  • Patent number: 11335373
    Abstract: 3D optical data storage refers to forms of optical data storage in which information can be recorded and/or read with 3D resolution. 3D optical media are generally limited in areal density by the diffraction limit of laser light used to read and/or write data to and/or from the optical media. It is thus advantageous to find ways to store data on 3D optical media with a spot size below the diffraction limit of an associated laser reader to further increase areal density of the optical media. A hybrid approach that utilizes plasmon technology to access a surface layer of the 3D optical media with an extremely small spot size and photon technology to access interior layers of the 3D optical media with a larger spot size may substantially increase overall data density of the 3D optical media.
    Type: Grant
    Filed: February 22, 2021
    Date of Patent: May 17, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Krishnan Subramanian, Aditya Jain, Riyan Alex Mendonsa, Anil J. Reddy, Edward Charles Gage
  • Publication number: 20220122637
    Abstract: An apparatus includes a housing, a data storage magazine configured to hold a plurality of data storage devices, and a movable carriage disposed within the housing that is configured to selectively couple the data storage devices to a host device. The data storage magazine includes a set of magazine signal paths configured to provide signals to the plurality of data storage devices. The movable carriage includes a set of carriage signal paths configured to provide signals to the plurality of data storage devices. The apparatus includes a controller configured to power the plurality of data storage devices by selectively routing the signals via the set of magazine signal paths or the set of carriage signal paths.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 21, 2022
    Applicant: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Brett Herdendorf, Krishnan Subramanian, Jon Trantham
  • Patent number: 11308990
    Abstract: An apparatus includes a housing, a data storage magazine configured to hold a plurality of data storage devices, and a movable carriage disposed within the housing that is configured to selectively couple the data storage devices to a host device. The data storage magazine includes a set of magazine signal paths configured to provide signals to the plurality of data storage devices. The movable carriage includes a set of carriage signal paths configured to provide signals to the plurality of data storage devices. The apparatus includes a controller configured to power the plurality of data storage devices by selectively routing the signals via the set of magazine signal paths or the set of carriage signal paths.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Brett Herdendorf, Krishnan Subramanian, Jon Trantham
  • Patent number: 11308984
    Abstract: A data storage device includes a ramp that supports at least one head, and a retraction mechanism that moves the ramp from a non-retracted position to a retracted position. The movement of the ramp is enabled by at least one of expansion or contraction of at least a portion of the retraction mechanism. The data storage device further includes a ramp retraction control module operably coupled to the retraction mechanism. The ramp retraction control module provides the retraction mechanism with a first control signal that causes the retraction mechanism to move the ramp from the non-retracted position to the retracted position.
    Type: Grant
    Filed: June 24, 2020
    Date of Patent: April 19, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Brett R. Herdendorf, Riyan Alex Mendonsa, Krishnan Subramanian
  • Publication number: 20220105741
    Abstract: Systems, devices, and methods may use input/output (I/O) apparatus and an optical switching medium to switch, or route, optical data signals. The optical switching medium may include a plurality of optical switching regions. The I/O apparatus may transmit optical data signals to and receive optical data signals from the optical switching medium to provide switching functionality.
    Type: Application
    Filed: October 18, 2021
    Publication date: April 7, 2022
    Inventors: Zoran Jandric, Kevin A. Gomez, Dan Mohr, Anil J. Reddy, Aditya Jain, Krishnan Subramanian
  • Patent number: 11294593
    Abstract: A storage system includes a media player including a preamplifier that is adapted to provide data access to a storage cartridge lacking an independent read/write preamplifier. The media player couples to the storage cartridges across an interconnect, and the storage cartridge is adapted to perform data access operations responsive to signals received from the media player through the interconnect.
    Type: Grant
    Filed: June 28, 2021
    Date of Patent: April 5, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Riyan Alex Mendonsa, Jon D Trantham, Peng Peng, Brett R. Herdendorf, Krishnan Subramanian
  • Publication number: 20220068300
    Abstract: A data storage device includes a base, a shaft that extends perpendicular from the base, and a head stack assembly (HSA) having a first end to which a head is coupled and a second end that is movably mounted on the shaft. The data storage device also includes either a first actuator assembly or a second actuator assembly. The first actuator assembly includes a first coil-permanent magnet assembly that rotatably moves the HSA about the shaft, and a second coil-permanent magnet assembly that serves as a first elevator to linearly move the HSA along the shaft. The second actuator assembly includes a third coil-permanent magnet assembly that rotatably moves the HSA about the shaft, and a second elevator that linearly moves the HSA along the shaft and also moves a data storage device ramp in unison with the HSA.
    Type: Application
    Filed: September 13, 2021
    Publication date: March 3, 2022
    Inventors: Brett R. Herdendorf, Riyan A, Mendonsa, Wolfgang Rosner, Jonathan Lewis Kemnitz, Krishnan Subramanian, Kurt LeRoy Erickson