If the user saves data consuming only half of the total user capacity of the drive, the other half of the user capacity will look like additional over-provisioning (as long as the TRIM command is supported in the system).
如果用户保存的数据仅占驱动器总用户容量的一半，用户容量的另一半看起来就如同额外的预留空间（只要系统支持TRIM命令）。