I want to install BT4 to a USB drive. I've been doing a bit of reading on what size driver I would need to install the OS and came across three different points of views regarding the size. I first read that 2GB was needed for a successful installation, then came across something saying a 4GB minimum. I just now came across a post saying 8GB. My question is how big should the drive be? I just got a 4GB driver in the mail yesterday, will that work or does it have to be bigger? Thank you all for any help.