No, VM can't format your real drive. But some special evil (viruses, spyware) soft in theory can corrupt your host data, that were shared with VM. So, if you have very-very-very important files, it is good idea to keep them in special forlder and don't share it with VM. But also you must understand, that probability of such case when guest and host are different OS is really very low, because viruses often (almost always) have no idea what to do on other platform
Last edited: May 22, 2007