*Technical Discussion of Live USB's: http://fedoraproject.org/wiki/How_to_create_and_use_Live_USB#Data_Persistence
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::Limited Lifetime of Persistent Overlay
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One very important note about using the "primary" persistent overlay for system changes is that due to the way it's currently implemented (as a LVM copy-on-write snapshot),
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every single change to it (writes AND deletes) subtracts from its free space, so it will eventually be "used up" and your USB stick will no longer boot.
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Because of these limitations, it is advisable to use the system-level persistence sparingly, for configuration changes and important security updates only.
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For a truly persistent write-many (vs write-once) overlay, use the --home-size-mb option to create a home directory filesystem image for personal files.
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Unlike the primary system overlay image, the home.img can be re-used and loop mounted outside of the liveusb environment.