2nd HD not recognized

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http://askubuntu.com – I have two internal Hard drives. One is a 200GB dual boot with Win7 & and Ubuntu 12.04. I unplugged the second drive, a 1 TB, during the OS installation process to make sure I didn't wipe out any of my files. When I plug in the TB drive now I get an "initramfs" error on start-up and can not get the drive to be recognized. When I unplug it (SATA), the OS's boot fine. Can I just plug in the TB drive while the power is running and hope it will be recognized, or will that fry something? So either I boot just the OS's or nothing at this point. Suggestions? (HowTos)