I purchased a Snap 2000 of of Ebay and installed 2 200gb seagate drives. I went into the debug page of the server:
http://ipaddress/config/debug
Type in the command box - config devices info
You should have a few drives listed with a number like 10006 or 10016
Type in the command box - config devices format 10006 /reinit and config devices format 10016 /reinit (replace numbers with whatever you get)
Reboot and wait till the new drive has been formatted