Aside from NAS being very expensive, this is the main reason I'm leaning toward a server. My library is still pretty small but I have a lot of dvd's to rip yet, and from there everything will be much bigger (blu-ray) so I can see this getting up near 20 TB in the next few years. Here's my question: right now I have a quad core windows 7 box with a couple 2 TB data drives (os is on ssd) and will probably add a couple 3 TB drives over the next year. At that point I'd need to buy an expansion card to grow further, or I may decide to build a dedicated server. If I run flexraid now on my windows 7 installation, are there any gotchas when I want to move those drives to a dedicated server, possibly on whs? What about if I want to go to linux? What about a different software raid? Is it a bad idea, and I should just bite the bullet and build the dedicated server now?