... Level Cell，通过控制内部的电荷的多少，就是控制External Gate去充电，与此相对应的是易失性存储设备(Volatile Memory Device)，称作 2的4次方＝16 Level Cell，称作2的2次方＝4 Level Cell，Multi Level Cell.
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属于非易失性存储设备 Non-volatile Memory Device
主存储器是一个易失性存储设备。系统失败时，会丢失其内容。
Main memory is a volatile storage device. It loses its contents in the case of system failure.
随着Yahoo ！和Google在商业方面的成功，tb级服务器和网络连接取代本地硬盘成为首选的非易失性存储设备。
With the advent of commercial successes like Yahoo! And Google, terabyte servers and network connections have replaced local hard disks as the preferred nonvolatile storage devices.
非易失性存储设备一般为硬盘，但也可以是安全数字（SD）卡之类的固态设备，甚至可以是磁带设备（不过现在已经过时了）。
Typically, nonvolatile memory devices are hard disks, but they can also be solid-state devices like secure digital (SD) cards and even magnetic tape devices (all but obsolete now).
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