Those are loud, and by loud I mean put it in a closet, close the door, walk down the hall, and you can still hear it.
If it’s JUST for storage, you could get a regular ATX case that holds 8 HDs and get a mini-ITX Intel Atom/Nvidia ION motherboard similar to the one I put in my media center. Runs on almost no power and if you’re ok with buying a PCIe x8 SATA card then you can add as many HDs as you need. Give it 8GB ram and Windows 2008 and you’ll be off to the races.