The ROCK mobile drive is still out there, although the company itself has - for good reason - gone out of business. It seems like a great deal for a terrabyte drive. Don't.
Their business model was pretty straightforward: they bought "seconds" from drive manufacturers, installed them in a snappy, slim-line case, and peddled them. Problem: there's a reason why the drives are cheap; they have really limited lifespans. Combine the fact that they're essentially factory rejects packaged in a slim case with no breathing room, and that lifespan drops off even faster. They overheat and die.
Do yourself a favor and drop $80 or so on a Seagate or WD external drive. The case will be large enough to deal with heat, and the drives themselves aren't factory "seconds". Moreover, access is significantly faster than you'll see on a "new" ROCK.
I've got to the point where if someone tells me they have problems with their external drive, I assume it's a ROCK. I've been able to salvage data off exactly one, and it died shortly thereafter.