I put in (4 ) 1.5 TB drives and have 5.45 "actual" to use... 1.39 is for "protection" and 4.06 is available for data.

Also, the descriptions read that you can use up to 2TB drives in these... but with the current firmware you can now use the newer 2.5 and 3 TB drives.

It appears that autocorrect has become my worst enema.