Patent ID: 11886335
Assignee: KIOXIA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. The memory system according to claim 1, wherein
the controller is configured to:
set a first threshold related to a block storing hot data among the plurality of blocks;
set a second threshold related to a block storing cold data among the plurality of blocks; and
when the first remaining time is less than or equal to the first threshold and the second threshold, and the second remaining time is i) greater than the first threshold and ii) less than or equal to the second threshold,
calculate a third rewrite speed based on i) the first remaining time, and ii) a third number of blocks, included in the first block set, storing the hot data and the cold data;
calculate a fourth rewrite speed based on the second remaining time and a sum of i) the third number of blocks and ii) a fourth number of blocks, included in the second block set, storing the cold data;
determine a new maximum rewrite speed among the third rewrite speed and the fourth rewrite speed; and
perform, at the determined new maximum rewrite speed, the rewrite operation on i) the third number of blocks included in the first block set and ii) the fourth number of blocks included in the second block set and storing the cold data.