External Hard Drive Not Showing Up?

So I recently purchased and installed a new hard drive in my PS3. To do that I had to reformat my Western Digital 250 GB hard drive to FAT32 format. Ok, so that's all well and good but I then decided to take my PS3, 60 GB HD (the brand escapes me, but it's a big manufacturer of hard drives) and put it in an external hard drive enclosure. I figured that it's a perfectly good hard drive so there was no sense wasting it. Anyway, as technologically impaired as I might sound after this (which I'm really not) I feel compelled to divulge that I actually did not know that two external hard drives shouldn't be too close to each other. As soon as I put one on top of the other, the 60 GB hard drive beeped and a message popped up saying it needed reformatting. So after reformatting everything a second time, I plugged in the hard drives and the 60 GB one showed up but my 250 GB one did not.

It's showing up everywhere else (disk management, device manager) but not in My Computer. So I have no access to it at all. Also, I did not need to reformat the 250 GB HD since my computer gave me no message indicating that I should. I'd rather only use reformatting as an absolute last resort since it takes HOURS but if it's necessary that I'll have to break down. Throw other options at me first though