edit: Patrick responded while I was writing this, so there are some redundancies. Sorry. I'd edit, but I gotta get to class.

Well . . . it's an exaggeration of my position, but he means that if my chances of rebuilding my array are virtually nonexistant, then a single hardware failure is tantamount to all four of my hard drives failing. Thus by raiding the drives together I have multiplied the danger. Had I mounted the drives individually and one drive died, I would only lose up to 25% of my data, but if RAID isn't going to do it's job and any one of the four drives fail, I lose 100% of my data.
Of course, that's not my position. Terastations have a bad track record, but that just means I'm nervous. Obviously they work a lot of the time. Otherwise Buffalo would get sued out of existence. Additionally, when I made my first post I did not know whether it was a controller failure or a drive failure. I actually suspected controller because the web interface did not work (though I could ping the address) and the physical power button on the drive wasn't functioning. Cutting the power and rebooting corrected both of those problems, though. At any rate, my exact words when it began to look like merely a drive failure were, "I'm temporarily heartened . . ." I.e., okay . . . if it's just a drive failure I may be alright after all. I'll replace the drive and cross my fingers.
I would love to have a more robust storage solution. I took a risk with the Terastation cos it had
just hit the market (i.e., no track record), and it cost about 1/3 what it's nearest competitor was charging for a similar feature set. I'm now a student with no income. I can't just up and say, "Hmm . . . I'm not very satisfied with my 2 terabyte network attached storage solution, I'll think just buy another and then sell this on Ebay." The reality of my situation is something more along the lines of, "Okay . . . it's the beginning of the semester so I haven't burned through all of my student loan money yet. A new drive for this will cost me $60-70. I
think I can swing that. I hope to god it works . . . cos there's no way I can sink any more money into it at the moment."