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As of Fedora15, a new directory under root was introduced. A couple of quotes:

i.e. /var is "persistant runtime data" and /run is "volatile runtime data", and /etc is "persistant system config data", and so on.
only early boot stuff should use /run, for now

I am running F18 with the default Gnome desktop and am very new to it. This morning I noticed that automounting defaults to /var/media. Why is that? When are /mount, /mnt and /run/mount used?

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It doesn't answer your question, but you may be interested in what the Filesystem Hierarchy Standard has to say about /mount and /mnt. pathname.com/fhs/pub/fhs-2.3.html#MEDIAMOUNTPOINT – Michael Kjörling Feb 8 '13 at 9:37
/run is a centralized place for all sorts of volatile runtime data, pulling together stuff previously scattered all over the place. /mount is gone, /mnt is the traditional place for the system administrator to mount stuff temporarily (e.g. an external disk for backups). – vonbrand Feb 8 '13 at 14:20
Forgot that recently removable media are mounted under /run/media/username, so only that user has access to them. – vonbrand Feb 8 '13 at 14:43
@vonbrand, on my F18 system, /mount is not gone. – Vorac Feb 10 '13 at 18:38
@Vorac, my (freshly installed) Fedora 18 has no /mount – vonbrand Feb 10 '13 at 18:39

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