公开(公告)号：US20220113898A1

公开(公告)日：2022-04-14

申请号：US17497573

申请日：2021-10-08

Applicant: Seagate Technology LLC

Inventor： Stacey Secatch ,  David W. Claude ,  Daniel J. Benjamin ,  Thomas V. Spencer ,  Matthew B. Lovell ,  Steven Williams ,  Stephen H. Perlmutter

IPC: G06F3/06

Abstract: A data storage system may have a plurality of memory cells located in different data storage devices that are arranged into a plurality of logical namespaces with each logical namespace configured to be sequentially written and entirely erased as a single unit. An asymmetry strategy may be proactively created with the asymmetry module in response to data access activity to the logical namespaces by the asymmetry module. A new mode, as prescribed by the asymmetry strategy, is entered for at least one logical namespace in response to an operational trigger being met. The new mode changes a timing of at least one queued data access request to at least one logical namespace.

公开(公告)号：US11017098B2

公开(公告)日：2021-05-25

申请号：US16021823

申请日：2018-06-28

Applicant: Seagate Technology LLC

Inventor： Stacey Secatch ,  Steven S. Williams ,  David W. Claude ,  Benjamin J. Scott ,  Kyumsung Lee ,  Stephen H. Perlmutter

IPC: G06F21/00 ,  G06F21/60 ,  H04L9/08 ,  G06F1/28 ,  G06F3/06 ,  G06F11/10

Abstract: Apparatus and method for managing entropy in a cryptographic processing system, such as but not limited to a solid-state drive (SSD). In some embodiments, a processing device is operated to transfer data between a host device and a non-volatile memory (NVM). In response to the detection of a power down event associated with the processing device, entropy associated with the power down event is collected and stored in a memory. Upon a subsequent reinitialization of the processing device, the entropy is conditioned and used as an input to a cryptographic function to subsequently transfer data between the host device and the NVM. In some embodiments, the entropy is obtained from the state of a hardware timer that provides a monotonically increasing count for timing control. In other embodiments, the entropy is obtained from a RAID buffer used to store data to a die set of the NVM.

公开(公告)号：US10896002B2

公开(公告)日：2021-01-19

申请号：US16212200

申请日：2018-12-06

Applicant: Seagate Technology LLC

Inventor： Benjamin J. Scott ,  Steven S. Williams ,  Stephen H. Perlmutter ,  Ryan J. Goss ,  Daniel J. Benjamin

IPC: G06F12/00 ,  G06F3/06 ,  G06F11/10 ,  G06F12/02 ,  G06F13/00 ,  G06F13/28

Abstract: Apparatus and method for managing metadata in a data storage device such as a solid-state drive (SSD). In some embodiments, a write stream is formed of user data blocks to be sequentially written to a non-volatile memory (NVM). An entry of a reverse directory footer is generated for each user data block in the write stream to describe a physical address in the NVM at which the corresponding user data block is to be stored. The entries are accumulated in a buffer memory until the total count of entries reaches a predetermined threshold and a complete footer data structure is formed. The complete footer data structure is thereafter inserted into the write stream for writing, with the data blocks, to the NVM. The complete footer data structure has an overall size that corresponds to an overall size of each of the user data blocks.

公开(公告)号：US10783982B2

公开(公告)日：2020-09-22

申请号：US16263640

申请日：2019-01-31

Applicant: Seagate Technology LLC

Inventor： Stephen H. Perlmutter

IPC: G11C7/10 ,  G11C29/52 ,  G11C16/06 ,  G06F11/10

Abstract: A data storage system can receive a data write request to write data to a physical address of a non-volatile semiconductor memory prior to detecting an error while storing the write data to the physical address. The detected error is corrected with a monitor module connected to the non-volatile semiconductor memory and a counter associated with the physical address is incremented with the monitor module in response to the corrected error. The write data can be subsequently read to a host in response to a data read request.

公开(公告)号：US10747662B2

公开(公告)日：2020-08-18

申请号：US16022822

申请日：2018-06-29

Applicant: Seagate Technology LLC

Inventor： Stephen H. Perlmutter ,  Stacey Secatch ,  Andrew Louder

IPC: G06F3/06 ,  G06F11/10 ,  G06F12/02 ,  G11C5/06

Abstract: Apparatus and method for managing a non-volatile memory (NVM) such as a flash memory in a solid-state drive (SSD). In some embodiments, the NVM is arranged as a plurality of semiconductor memory dies coupled to a controller circuit using a plurality of channels. The controller circuit divides the plurality of dies into a succession of garbage collection units (GCUs). Each GCU is independently erasable and allocatable for storage of user data. The GCUs are staggered so that each GCU is formed from a different subset of the dies in the NVM. In further embodiments, the dies are arranged into NVM sets in accordance with the NVMe (Non-Volatile Memory Express) specification with each NVM set addressable by a different user for storage of data in a separate set of staggered GCUs.