I got an email saying Berger0267 replied to this, but as I'm typing this it doesn't appear on the thread, so I'll quote it here in case others can't see it:
"Have you tried this RAW drive on another computer? Get the same problem?
You may have to format this RAW drive back to NTFS and then, use it as before.
But, since your important data is still stored there, I think you'd better firstly use some data recovery tools to get back your drive data with success, like:
freeware-fix.blogspot.com/2013/02/hard-drive-recovery.html
Next time, always get accustomed to make drive data backups well. "
I tried plugging it in to my Windows 8.1 Microsoft Surface Pro and my Windows 7 home desktop computer. Both had the same problem, it wasn't detected in disk manager and vastly slowed down Windows. I have tried a few different free recovery tools, including the first option in the link you posted (iCare 5.4), with no luck. At first, I tried the Lost Partition Recovery option. It recognized "Seagate Portable USB Device" but was unable to detect a size or anything for it. I tried to run the recovery, but it said it didn't detect any files. So I tried all the other options. A couple were unable to detect it at all, and another I think had the same outcome as the first. After reading the link you sent, I downloaded the two options and tried them. When I tried iCare again and choose any option, it says "Please wait, scanning system..." and freezes, not responding. When I tried to run the second program, it sat at a loading screen forever and never opened. I think this is the work of the hard drive making these programs not respond. Like I said, it really seems to bog down things trying to access it. Is there alternative data recovery method?