Originally Posted By: Cris
If I build a software RAID5, could I expand it in the future by adding 2Tb drives as required ???

On Linux you can, but since FreeNAS is based on FreeBSD, I think the answer is no, you have to backup, rebuild and restore. That's the recommendation in their FAQ. The people who are growing RAID arrays under FreeNAS all seem to be using RAID1. You might want to take a look at OpenFiler, which is Linux-based, if you prefer to use RAID5.