The thing is that the computer you referenced doesn't support 48-bit LBA, and thusly can only use 128GB of any hard drive you stick in there... even if you try to get sneaky and say, "Hey, I'll just make multiple 128GB partitions!" it won't work -- it's 128GB per hard drive, not per partition.
I have a FW enclosure that has the same problem, so if you're just re-using an old one that had a small drive in it, you might end up at the same problem again. But I don't think you could buy one of those new anymore...