Appendix 3: The Loop Device
245
later. Once the file system has been created, and a loop device associated
with file, it can be mounted using the following command line:
mount  t ext2 /dev/loop0 /mnt
When this is later unmounted make sure to release the device with the com 
mand losetup  d /dev/loop1. Another alternative is to release the loop device
as soon as the file system creation is complete, and mount the file as in the
previous example with a command like:
mount  t ext2  o loop=/../image.file /mnt
In either case this produces a  file system  mounted on /mnt that has 100 MB
of storage space. Whatever this file system is intended to contain can now be
copied, or untarred, or otherwise created on the new file system.
It should be evident that loop devices are very useful critters. The instal 
lation software makes use of one to perform several sets in the installation
by mounting image files from the CD, instead of requiring a floppy disk to
mount. This is not only faster, but physically easier than the floppy installa 
tion method.






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