Old External drive appears on SYS. Info., not Disc Utility.

-I have a external enclosure containing my used hdd from my old windows machine connected to my macbook pro retina.
-I am trying to clear it to use with just my mac and cannot see it in my Disc utility, yet can see it in my System info under the usb location.
-There is data on the drive that I wanted to save, but now im desperate enough to just want the drive to backup on.
-I was able to see the drive on my replacement windows machine in disc management but was unable to access it because anything i would do would respond "disc is not ready" or something along those lines.
-I've ruled out connection problems due to the fact that I can see the drive appear in System Information when plugged in, and it is gone when unplugged.
-I have tried a cold boot and get the results above, and trying to hot boot makes my computer not able to boot up at all, even when I dictate to boot with my internal boot drive.
Thank you for any advise!

you can only repair and verify permissions on a drive with OS X installed. so that part is completely normal.
see this link to unlock the drives:
http://discussions.apple.com/thread.jspa?messageID=8173371&#8173371

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