许多 CD 使用的压缩文件系统映像通常是系统的闭环压缩回送驱动程序附带的。
Many CDs use a compressed filesystem image that often comes with the cloop compressed loopback driver.
linuxrc的主要任务是安装CD，从而使回送文件系统本身也可以被安装和访问。
Linuxrc's primary task is to get the CD mounted so that the loopback filesystem can itself be mounted and accessed.
initrd映像是包含我们的迷你根文件系统的回送文件系统映像(此映像可以使用gzip进行压缩以减少其大小)。
The initrd image is a loopback filesystem image which contains our mini-root filesystem (this image can optionally compressed with gzip to reduce its size).
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