I'm thinking of returning the DNS-325 because I can't get the printer to work under Linux or Windows 7 with the software D-Link supplied. I now worry that I made a bad decision because while the box cost me $165 without hard drives, I had planned to use those WD 2TB caviar green drives, and one user on the forum just complained they won't work in the raid configuration I intend to use.
http://www.bit-tech.net/hardware/storage/2010/07/23/how-to-build-a-nas-box/
This link shows an alternative that will cost more and take more setup time, but provide more flexibility. It explains how FreeNAS, a version of FreeBSD UNIX with the fast and fabulous XFS file system, can to into the right hardware to make a high powered, cost effective Network Architecture Server like the DNS-325 SHOULD be. It will end up costing 3 times as much except that you can use an old computer with some new drives in it, and install FreeNAS into it.
Read about FreeNAS here: http://www.freenas.org/
Read about XFS here: http://www.freenas.org/
and here: http://wiki.freebsd.org/ZFS
and here: http://www.freebsd.org/doc/handbook/filesystems-zfs.html
When you finish, you'll realize how wonderful the DNS-325 can become, costing around about $400 for a 4T RAID solution in a little box that uses a web interface for control and insulates ignorant users from the arcane UNIX interface.
I make this point: you have to figure out how you want to spend your life. I imagine DNS-325 engineers intended to let you spend as much as possible on other pursuits. Unfortunately, they have failed, and I have wasted hours and phone calls and reading useless forum entries, still can't print with it, and haven't yet installed any hard drives in it.