I am panicking. I was trying to get an external hard drive to start working again but like a dumb-dumb, I marked it as active. (It's working now but that may be because I reassigned the drive letter.) Now I am reading that only the partition with the boot bios can be marked active or my computer will not reboot. Please look at this screen shot and tell me which should be mark 'Active' http://i.imgur.com/NUzRi.png Lastly, if I need to un-mark the R drive from being active, how do I do that? Thanks in advance for your help. I am terrified to reboot right now.