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== Installing Linux on and booting it from FAT volumes using umsdos ==
As mentioned, ''umsdos'' permits installing Linux on, and then bootstrapping and running it from, a FAT format disc volume. The advantage of this is that it permits the use of Linux on a computer where [[DOS]] is already installed, without requiring that the hard disc be [[partition (computing)|repartitioned]]. Linux is not bootstrapped directly from a [[Volume Boot Record]] in such a scenario. Instead DOS is first bootstrapped, and [[loadlin]] or linld is used to then bootstrap Linux from DOS.<ref name=McCune />
The convention for such an installation is for the Linux [[root directory]] to be a subdirectory of the actual root directory of the DOS [[system partition and boot partition|boot volume]], e.g. <tt>C:\LINUX</tt> . The various Linux top-level directories are thus, to DOS, directories such as <tt>C:\LINUX\ETC</tt> (for <tt>/etc</tt>), <tt>C:\LINUX\BIN</tt> (for <tt>/bin</tt>), <tt>C:\LINUX\LIB</tt> (for <tt>/lib</tt>), and so forth. The ''umsdos'' filesystem driver automatically prepends the <tt>C:\LINUX\</tt> to all pathnames. The ___location of the Linux root directory is supplied to the ''umsdos'' filesystem driver in the first place via an option to the <tt>loadlin</tt> command. So, for example, for the aforegiven root directory <tt>loadlin</tt> would be invoked with a command line such as <source lang=bash enclose=none>loadlin c:\linux\boot\vmlinuz rw root=c:\linux</source> .<ref name=McCune /><ref name=Danesh>{{cite book|title=Making Linux work: essential tips & techniques|series=1001 Tips Series|author=Arman Danesh|publisher=Cengage Learning|year=2002|isbn= 978-1-884133-78-7|pages=19}}</ref>
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