可选特性包括内置硬盘驱动器、硬加密模块，以及更多的闪存架(flash bay)。
Optional features including internal hard drives, hardened cryptographic modules, and additional compact flash bays.
但常见的情况是，机器中可能没有任何可用的驱动器托架(笔记本电脑更是如此，它通常仅允许一个内置硬盘驱动器)。
But often, you may not have any free drive bays in your case (this is particularly true of laptops, which typically only allow one internal hard drive).
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