Kioxia Corporation

Hiromi Hoshino

Yoko Masuo

A memory system connectable to a host includes a nonvolatile memory and a controller. The nonvolatile memory includes physical blocks. The controller is configured to assign each of a plurality of block groups, each block group including a predetermined number or more of the physical blocks, to one of categories. The controller assigns block groups having a total capacity equal to a fraction of the overprovisioning capacity that is equal to a first threshold value, to the first category, and block groups having a total capacity equal to a remaining part of the overprovisioning capacity to the third category. When an overprovisioning ratio falls below a second threshold value, the controller reassigns one or more block groups in the third category to the first category.

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Kawasaki Kanagawa, Japan

Hiromi Hoshino