I'm planning to install the win7 beta on a secondary disk drive creating a dual boot option between win7 and XP. If and when Microsoft releases the full version of win7 for retail public sale, what do I do with the win7 beta on the disk? Will installing the full version overwrite or upgrade that beta? Or would you have to re-format that disk wiping it clean. From what I understand, when installing the win7 beta, it makes an entry in the XP boot.ini file making the boot.ini no longer necessary. If in the future I wipe the win7 beta drive clean with a format, wouldn't that make a boot-up into XP impossible?