"format" option in right click context menu of nautilus

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https://bbs.archlinux.org – Hi everyone i'm new in the forum and so i'd like to introduce myself! I tried various distros and then i set on Arch , the best! i'd like to solve this issue: on other distros as for example fedora 16, using gnome shell, when i insert a usb stick and the icon appears on the desktop, if i right click on it, the option "format" is in the context menu...but i can't set this in arch... where am i wrong? please help!Ps: i installed gnome-disk-utility because i thought that the option format was related to the program, as for example the "extract" option with (HowTos)