Right, this question comes off the back of the new Windows 8 Dev Preview that's circling around. Basically I want a way to install onto and boot from an External HDD entirely. I don't want my current boot table being touched at all. My computer is capable of booting Linux USB Keys etc. so why not an OS on an Ext. HDD? I know from experience just installing to another HDD will edit my current MBR, so is there anyway to get Windows 8 to stick its boot stuff onto the 2nd, removable HDD? This would, in theory, create a portable system that can be booted by any computer that can boot from an External Drive.