Formatting one's hard disk is rarely a necessity, however, many a times it happens, particularly in the case of
windows, in which the functionality of the OS is so complex, that one cannot understand what exactly goes wrong, and one has to reformat.The best bet, as said, is to keep your personal files, settings etc on a different partition. I have all my settings, downloads etc on a seperate /home partition. So if I ever have to format any of my linux distro's, I get all the settings, customisations, tweaks for all my applications back
