It's Hard Disk Drive.

On another note, quite a few members on a Swedish hardware community that I visit (Sweclockers) have reported that their Barracuda drives have broken after a few months of usage. I suppose it could be some random fluke, but either way, I'd rather go for a 600+ GB Caviar series drive by Western Digital (or a similar drive if that particular model doesn't fit your system) for an extra $20 or so: http://www.newegg.com/Product/Produc...82E16822136298

Oh, and if you're into performance, ignore those pesky Raptors: http://www.nextlevelhardware.com/storage/battleship

(I read a newer article a few months ago in which the author used a slightly faster SSD setup, but I was unable to find it again.)

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram