This is a typical question where the answer changes based on time. The question has been asked in 2011, and by early 2014 sufficiently powerful x86 processors have arrived on the market that do not require active cooling.
You still need to worry about cooling the disks, which now can consume a lot more power than any other component (easily 10 W per disk, depending on the disk). This can be addressed with a good passive cooling solution, or by selecting disks that do not produce as much heat. If the case is not specially designed for passive cooling, heat will build up and if you have components producing as little as 20 W of heat, they will boil themselves to death.
There are 3 options:
- Buy an off-the-shelf solution, including disks, and be aware that you cannot swap the disks for any disks with a higher power draw. Nowadays "fanless NAS" produces quite a few good search results (and listing any model wouldn't do this answer any good a few years down the road)
- Go with external components that already have their own enclosure. Get a cheap and tiny PC (something like a ZBox PI320, ECS LIVA, or even a Raspberry Pi), and attach a couple external harddisks or RAID enclosures.
- Look for specs of the various components, such as maximum power draw, and assemble your own.
3Shopping Recommendations are off topic at SU. Please see the FAQ for some clarification on what kinds of questions we like here, and how to ask them. – Ƭᴇcʜιᴇ007 – 2011-10-03T18:06:37.383
1@techie007 I looked at the FAQ, and although I suppose this is a bit of a shopping recommendation question, it is also a question of whether it is possible to find a NAS without a fan. Which is maybe a broader question? – Jason Sundram – 2011-10-03T18:08:03.343
4@techie007 We rewrote the question to make it more general and less of a shopping recommendation. In this state I think it's fine to stay. – slhck – 2011-10-03T18:42:38.453
@slchk - Looks better to me. My only last suggestion would be that this is really two questions. "Are there any?" and "How do I build my own"? But hey. ;) – Ƭᴇcʜιᴇ007 – 2011-10-03T18:47:45.040
1Certainly there are fanless computers. However, it appears that most either use solid state drives or have at most one drive slot. Passively cooling multiple drives would require substantial heat sink surface. – Daniel R Hicks – 2012-02-08T13:08:37.120