There is the inexpensive Buffalo NAS Station box which can do RAID-0, RAID-1 or RAID-5. It attaches to Ethernet and does standard NAS using CIFS/SMB type sharing (not NFS). It does not do higher end iSCSI (or AoE) SAN. If you bought the model with the least capacity, you could presumably replace its drives with large drives of your choice, like the 750 GB Seagate 7200.10. You might run into the 2 TB brick wall that some RAID controllers seem to have if you loaded it up with 4 Seagate 750 GB hard drives. And like Akisasaki says above, you could just setup a typical file server based on a simple cheap barebones but good CPU. If I had to do this, I might consider building a small form factor PC chassis based on a inexpensive AMD Sempron 2200 or an inexpensive low power Intel Core Solo desktop processor when they become available, which ever is cheaper. The small form factor chassis won't need a monitor, keyboard or mouse attached to it at all times, just 1 power and 1 network cable.