First, it's not a folder, it's a partition. Second, do not delete anything in roofs! Like Rob1n said, reboot first, then uninstall anything you got from the devel repo. Reboot again after removing those apps. Do not use the devel repo again until you have a thorough understanding of what happens when you do, and how to fix things when they go bad. Absolutely there is! Like, key system files. Again, do not delete anything in roofs! No, the best way is to use only software properly packaged for Maemo 5. The rootfs cannot be significantly increased, especially not to 5GB, nor does it need to be. Do not try to modify your filesystem until you have a much more comprehensive understanding of Linux, how it works and is organized. No offense, but you sound like so many new Linux users, who try to do far, far more than they should because they hear about this or that trick or program, and because with linux, they can. They try compiling software, running alpha software, download all sorts of things willy-nilly - generally try all kinds of stuff they would never dream of doing on a Windows box, get themselves in all kinds of trouble, then blame linux for being no good and/or hard to use. Stick with the Nokia and Maemo repositories, maybe a little of Testing. Learn before you leap.