公开(公告)号：US11693770B2

公开(公告)日：2023-07-04

申请号：US17464480

申请日：2021-09-01

Applicant: Kioxia Corporation

Inventor： Shinichi Kanno ,  Naoki Esaka

IPC: G06F12/02 ,  G06F3/06 ,  G06F12/1018

CPC classification number: G06F12/0261 ,  G06F3/0608 ,  G06F3/0641 ,  G06F3/0688 ,  G06F12/0246 ,  G06F12/1018 ,  G06F2212/1044 ,  G06F2212/2022 ,  G06F2212/7201 ,  G06F2212/7205

Abstract: According to one embodiment, a memory system manages a plurality of management tables corresponding to a plurality of first blocks in a nonvolatile memory. Each management table includes a plurality of reference counts corresponding to a plurality of data in a corresponding first block. The memory system copies a set of data included in a copy-source block for garbage collection and corresponding respectively to reference counts belonging to a first reference count range to a first copy-destination block, and copies a set of data included in the copy-source block and corresponding respectively to reference counts belonging to a second reference count range having a lower limit higher than an upper limit of the first reference count range to a second copy-destination block.

公开(公告)号：US20220083466A1

公开(公告)日：2022-03-17

申请号：US17464480

申请日：2021-09-01

Applicant: Kioxia Corporation

Inventor： Shinichi Kanno ,  Naoki Esaka

IPC: G06F12/02 ,  G06F12/1018 ,  G06F3/06

Abstract: According to one embodiment, a memory system manages a plurality of management tables corresponding to a plurality of first blocks in a nonvolatile memory. Each management table includes a plurality of reference counts corresponding to a plurality of data in a corresponding first block. The memory system copies a set of data included in a copy-source block for garbage collection and corresponding respectively to reference counts belonging to a first reference count range to a first copy-destination block, and copies a set of data included in the copy-source block and corresponding respectively to reference counts belonging to a second reference count range having a lower limit higher than an upper limit of the first reference count range to a second copy-destination block.