Alright, well I have great news to report!
The new
Link Removed - Invalid URL I ordered came in today, and the hard drive was finally recognized by my computer. So, I'm guessing the enclosure was the problem all along, heh...
I went ahead and used the Seagate DiscWizard and cloned my old hard drive to the RMA'd one, and put it into my laptop, and it worked perfectly.
As a matter of fact, I'm actually running off the RMA'd HDD right now, with 100 GB free as compared to only 30 GB free, woot!
So, in the end the enclosure was the problem, and using Seagate's DiscWizard to clone the drive worked perfectly.