Disable disk usage alerts

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http://forums.fedoraforum.org – I have a partition with some data which has only 500 mb left, and every time I log in I get an alert saying that the disk is running low on space. I'd like to disable the alerts, but haven't found a way, so I was wondering if anybody has managed to do it. By the way, I'm running Gnome (3.6) on F18. (HowTos)