You can take a disk file, format it as an ext2, ext3, or reiser
filesystem, and then mount it, just like a physical drive. It's then
possible to read and write files to this newly-mounted device. You can
also copy the complete filesystem, since it is just a file, to another
computer. If security is an issue, read on. This article will show you
how to encrypt the filesystem and mount it with ACL (Access Control
Lists), which gives you rights beyond the traditional read (r), write
(w), and execute (x) permissions for the three user groups "file",
"owner", and "other".
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