"P6X58D-E BIOS 0803
Fixed raid hdd size issue"
252mb is not a bios. the asus website posted the Rapid Storage Technology Driver in the bios section. it's a typo. ignore it. bios updates do not come with software. the bios is for the motherboard only. it has nothing to do with Windows period. only flash the bios if you are upgrading your processor or if you experience non-Windows related problems with your computer's operation.