It appears that Newisys is busy preparing a new firmware patch which should eliminate the need for a specially prepared harddisk to be used with a barebone version.

This means that you can buy a barebone (without preconfigured harddisks) NA-1400 and add your own harddisks as you see fit. The new firmware then will take care that the harddisks are properly configured. This is a major improvement over the previous solution because it can be considerably cheaper to assemble your own NA-1400 this way. It also means that you are not limited to the four standard configurations anymore (1 TB, 1.2 TB, 1.6 TB or 2 TB), a barebone combined with four 750 GB harddisk would result in 3 TB raw storage space (2.2 TB using RAID-5)!