在没有存储设备的嵌入式系统中，initrd是永久的根文件系统。
In embedded systems with no mutable storage, the initrd is the permanent root file system.
它们的根长得不深，所以永久冻土不会影响它们的生长。
Their roots don't grow very deep, so the permafrost doesn't interfere with their growth.
由于在很多基于Linux的嵌入式系统上没有硬盘，因此initrd也会作为这种系统上的永久根文件系统使用。
Because there is no hard drive in many embedded systems based on Linux, the initrd also serves as the permanent root file system.
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