Patents by Inventor Brian T. Edgar

Brian T. Edgar 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).

  • Publication number: 20210286552
    Abstract: A data storage system can connect a cache memory to a caching module, a host, and a data storage device. The caching module can employ one or more local controllers to generate a caching strategy in response to detected data storage operations and execute the caching strategy to divide the cache memory into a first pool having a first size and a second pool having a second size.
    Type: Application
    Filed: March 13, 2020
    Publication date: September 16, 2021
    Inventors: Jin Quan Shen, Xiong Liu, Brian T. Edgar, Jae Ik Song
  • Patent number: 10867633
    Abstract: Systems and methods are disclosed for reducing adjacent track erasure from write retry operations. In certain embodiments, an apparatus may comprise a circuit configured to abort a write operation while writing to a selected sector of a disc storage medium during a first revolution of the disc storage medium, and mark the selected sector as a temporary bad sector in a mapping table. The circuit may perform a write retry to continue the write operation starting at a next sector contiguously following the selected sector, without attempting to write the selected sector again, during a second revolution of the magnetic disc.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: December 15, 2020
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Brian T. Edgar, Feng Shen, Wenxiang Xie, Quan Li
  • Patent number: 10832705
    Abstract: Methods and apparatus for allocating logical sectors and bands to store data on interlaced magnetic recording tracks. The systems and methods include formatting a data storage medium to include a plurality of bands, each band of the plurality of bands including a plurality of tracks, the plurality of tracks including a subset of top tracks interlaced with a subset of bottom tracks, and each track of the plurality of tracks including a number of sectors, formatting a first band of the plurality of bands, determining an isolation region of the first band, and formatting a second band of the plurality of bands responsive to determining the isolation region of the first band.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: November 10, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wei Loon Ng, Brian T. Edgar
  • Patent number: 10755742
    Abstract: An implementation of a system disclosed herein provides a method for managing data streams of sequential nature, wherein the method provides for determining that a sequence of incoming write commands are associated with an LBA range mapped to a source band and writing data of the incoming write commands to physical blocks of a destination band assigned to the LBA range of the source band such that the data of the incoming write commands is written according to a sequential order of data receipt and in a forward write direction to sequentially fill physically-consecutive blocks in the destination band.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: August 25, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jun Cai, Brian T. Edgar
  • Patent number: 10747678
    Abstract: A data storage device includes a storage tier and a storage controller operably coupled to the storage tier and configured to be communicatively coupled to a host device. The storage controller includes a first memory operably coupled to the storage controller and configured to store a superseding data structure. The storage controller further includes a second memory operably coupled to the storage controller and configured to store a forward map configured to map a plurality of logical block addresses to physical locations on the storage tier. The storage controller further includes a sifting module configured to sift the forward map based on data contained in the superseding data structure. The storage controller further includes a compression module configured to compress the forward map to generate a compressed forward map.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: August 18, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Brian T. Edgar, Mark A. Gaertner, John Livdahl
  • Publication number: 20200260139
    Abstract: A method of recording data received as part of a multi-channel data stream includes writing a first subset of initially-received channel segments of a multi-channel stream to corresponding main store locations instead of a write cache while writing a second subset of initially-received channel segments of the multi-channel stream to a write cache instead of corresponding main store locations. The method further provides for writing continuation segments associated with the first and second subsets of the initially-received channel segments to the write cache and flushing a collection of same-channel segments out of the write cache responsive to a determination that the same-channel segments satisfy a coalescence condition.
    Type: Application
    Filed: March 25, 2020
    Publication date: August 13, 2020
    Inventors: Brian T. EDGAR, Vasili V. ZHDANKIN
  • Publication number: 20200243107
    Abstract: Methods and apparatus for allocating logical sectors and bands to store data on interlaced magnetic recording tracks. The systems and methods include formatting a data storage medium to include a plurality of bands, each band of the plurality of bands including a plurality of tracks, the plurality of tracks including a subset of top tracks interlaced with a subset of bottom tracks, and each track of the plurality of tracks including a number of sectors, formatting a first band of the plurality of bands, determining an isolation region of the first band, and formatting a second band of the plurality of bands responsive to determining the isolation region of the first band.
    Type: Application
    Filed: February 5, 2020
    Publication date: July 30, 2020
    Inventors: Wei Loon Ng, Brian T. Edgar
  • Patent number: 10645442
    Abstract: A method of recording data received as part of a multi-channel data stream includes writing a first subset of initially-received channel segments of a multi-channel stream to corresponding main store locations instead of a write cache while writing a second subset of initially-received channel segments of the multi-channel stream to a write cache instead of corresponding main store locations. The method further provides for writing continuation segments associated with the first and second subsets of the initially-received channel segments to the write cache and flushing a collection of same-channel segments out of the write cache responsive to a determination that the same-channel segments satisfy a coalescence condition.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: May 5, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Brian T. Edgar, Vasili V. Zhdankin
  • Patent number: 10629238
    Abstract: An apparatus includes a logical space and first and second physical spaces. The apparatus further includes a map in which first successive alternate logical elements of the logical space are mapped to successive adjacent physical elements of the first physical space, and second successive alternate logical elements of the logical space are mapped to successive adjacent physical elements of the second physical space. A control circuit employs the map to substantially concurrently manage storage of data extents into the first and second physical space by routing a first subset of the data extents into the first physical space, routing a second subset of the data extents into the second physical space, and splitting individual extents of a third subset of the data extents into sub-portions, with at least one of the sub-portions being routed to the first physical space and another sub-portion being routed to the second physical space.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: April 21, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Bruce Buch, Xiong Liu, Kenneth Haapala, Brian T. Edgar
  • Patent number: 10593354
    Abstract: Methods and apparatus for allocating logical sectors and bands to store data on interlaced magnetic recording tracks. The systems and methods include formatting a data storage medium to include a plurality of bands, each band of the plurality of bands including a plurality of tracks, the plurality of tracks including a subset of top tracks interlaced with a subset of bottom tracks, and each track of the plurality of tracks including a number of sectors, formatting a first band of the plurality of bands, determining an isolation region of the first band, and formatting a second band of the plurality of bands responsive to determining the isolation region of the first band.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: March 17, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wei Loon Ng, Brian T. Edgar
  • Publication number: 20200068251
    Abstract: A method of recording data received as part of a multi-channel data stream includes writing a first subset of initially-received channel segments of a multi-channel stream to corresponding main store locations instead of a write cache while writing a second subset of initially-received channel segments of the multi-channel stream to a write cache instead of corresponding main store locations. The method further provides for writing continuation segments associated with the first and second subsets of the initially-received channel segments to the write cache and flushing a collection of same-channel segments out of the write cache responsive to a determination that the same-channel segments satisfy a coalescence condition.
    Type: Application
    Filed: August 21, 2018
    Publication date: February 27, 2020
    Inventors: Brian T. Edgar, Vasili V. Zhdankin
  • Patent number: 10379741
    Abstract: Implementations disclosed herein provide for increasing storage drive performance by reserving a region of user-writeable storage space on a storage medium for overprovisioning uses, including performance-enhancing functions. Until a capacity condition of the storage drive is satisfied, write operations targeting the reserved region are written to another equal-sized region that does not contain user data.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: August 13, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Daniel J. Sokolov, Bang C. Nguyen, Andrew M. Kowles, Cameron S. McGary, Adam J. Weikal, Brian T. Edgar
  • Patent number: 10347284
    Abstract: An implementation of a system disclosed herein provides a method for managing data streams of sequential nature, wherein the method writes the sequential chunks (fragments) directly to an open band in the order these are received from the host and includes determining an end of the incoming data write request related to streaming data and in response to the determination of the end of the incoming data write request related to streaming data, copying remaining data from a current physical band mapped to logical block addresses LBAs related to the data write requests to the allocated (open) band.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: July 9, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Anil Kashyap, Brian T. Edgar
  • Publication number: 20190172490
    Abstract: An implementation of a system disclosed herein provides a method for managing data streams of sequential nature, wherein the method provides for determining that a sequence of incoming write commands are associated with an LBA range mapped to a source band and writing data of the incoming write commands to physical blocks of a destination band assigned to the LBA range of the source band such that the data of the incoming write commands is written according to a sequential order of data receipt and in a forward write direction to sequentially fill physically-consecutive blocks in the destination band.
    Type: Application
    Filed: January 24, 2019
    Publication date: June 6, 2019
    Inventors: Jun Cai, Brian T. Edgar
  • Patent number: 10073735
    Abstract: Systems and methods are disclosed for a seeding mechanism for error detection codes. An error detection code may be generated using specifically modified seed input and stored to data sectors not containing valid data. A data storage device may determine if read attempts are directed to an invalid sector by analysis of the stored error detection code. In some embodiments, an apparatus may determine a first error detection code stored to a target data storage sector does not match a second error detection code calculated for the target data storage sector, compare the first error detection code to a modified error code value to determine whether the target data storage sector contains valid data, and return an indication that the target data storage sector does not contain valid data when the error detection code matches the modified error code value.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: September 11, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jun Cai, Jeetandra Kella, ChuanPeng Ong, Brian T Edgar
  • Patent number: 10037277
    Abstract: A data storage device includes one or more storage media that include multiple physical storage locations. The device also includes at least one cache memory having a logical space that includes a plurality of separately managed logical block address (LBA) ranges. Additionally, a controller is included in the device. The controller is configured to receive data extents addressed by a first LBA and a logical block count. The controller is also configured to identify at least one separately managed LBA range of the plurality of separately managed LBA ranges in the at least one cache memory based on LBAs associated with at least some of the received data extents. The controller stores the at least some of the received data extents in substantially monotonically increasing LBA order in at least one physical storage location, of the at least one cache memory, assigned to the identified at least one LBA range.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: July 31, 2018
    Assignee: Seagate Technology LLC
    Inventors: Timothy R. Feldman, Andrew M. Kowles, Mark Allen Gaertner, Brian T. Edgar
  • Patent number: 9971645
    Abstract: Apparatus and method for managing a media cache of a data storage device. In some embodiments, a media cache master table is maintained in a memory as a data structure having a plurality of entries that describe data sets stored in a non-volatile media cache memory. A first timecode stamp value is written to respective first and second locations in the table at the commencement of a data transfer operation to transfer data associated with the plurality of entries in the table. The first location is updated with a new, second timecode stamp value responsive to detection of an error condition that interrupts the data transfer operation. An error recovery operation is subsequently performed responsive to a detected mismatch between the timecode stamp values in the first and second locations.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: May 15, 2018
    Assignee: Seagate Technology LLC
    Inventors: Jian Qiang, WenXiang Xie, Thein Than Zaw, Brian T. Edgar
  • Publication number: 20180121364
    Abstract: A data storage device includes a storage tier and a storage controller operably coupled to the storage tier and configured to be communicatively coupled to a host device. The storage controller includes a first memory operably coupled to the storage controller and configured to store a superseding data structure. The storage controller further includes a second memory operably coupled to the storage controller and configured to store a forward map configured to map a plurality of logical block addresses to physical locations on the storage tier. The storage controller further includes a sifting module configured to sift the forward map based on data contained in the superseding data structure. The storage controller further includes a compression module configured to compress the forward map to generate a compressed forward map.
    Type: Application
    Filed: October 27, 2016
    Publication date: May 3, 2018
    Inventors: Brian T. Edgar, Mark A. Gaertner, John Livdahl
  • Patent number: 9921774
    Abstract: The disclosure is related to systems and methods of managing data storage in a memory device. In a particular embodiment, a method is disclosed that includes receiving, in a data storage device, at least one data packet that has a size that is different from an allocated storage capacity of at least one physical destination location on a data storage medium in the data storage device for the at least one data packet. The method also includes storing the at least one received data packet in a non-volatile cache memory prior to transferring the at least one received data packet to the at least one physical destination location.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: March 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Luke W. Friendshuh, Brian T. Edgar, Mark A. Gaertner
  • Publication number: 20180060162
    Abstract: Apparatus and method for managing a media cache of a data storage device. In some embodiments, a media cache master table is maintained in a memory as a data structure having a plurality of entries that describe data sets stored in a non-volatile media cache memory. A first timecode stamp value is written to respective first and second locations in the table at the commencement of a data transfer operation to transfer data associated with the plurality of entries in the table. The first location is updated with a new, second timecode stamp value responsive to detection of an error condition that interrupts the data transfer operation. An error recovery operation is subsequently performed responsive to a detected mismatch between the timecode stamp values in the first and second locations.
    Type: Application
    Filed: August 23, 2016
    Publication date: March 1, 2018
    Inventors: Jian Qiang, WenXiang Xie, Thein Than Zaw, Brian T. Edgar