The dangers of BSI (Boot Sector Infector) viruses are far greater than imagined now. A possible virus could be hitting ( rumor has it ) that flashes the BIOS on boot.

This virus, although I've never seen it, is said to be very bad, because one of the things it's also said to do is prolong the boot process. During the boot process, it is secretly formatting all A: drives. Be careful and be on the look out. It may or may not come out because of the virii makers decisions. Just a word of caution, though. One BSI can destroy everything.