公开(公告)号：US20180373643A1

公开(公告)日：2018-12-27

申请号：US15869867

申请日：2018-01-12

Applicant: Silicon Motion, Inc.

Inventor： Chien-Chung CHUNG ,  Kuan-Hui LI ,  Yi-Chang HUANG

IPC: G06F12/1009

CPC classification number: G06F12/1009 ,  G06F12/0246 ,  G06F2212/1041 ,  G06F2212/2022 ,  G06F2212/657 ,  G06F2212/7201 ,  G06F2212/7206

Abstract: A data storage device includes a flash memory and a flash memory controller. The flash memory controller operates the flash memory to store data, and stores a mapping table to record the mapping information between a plurality of logical addresses and a plurality of physical addresses of the flash memory. The mapping table is divided into a plurality of groups. Some of the groups are categorized into a first type of trim group and some of the logical addresses of each of the groups of the first type of trim group are included in a trim command. The flash memory controller performs the trim on the groups of the first type of trim group.