I have a Cavalry 1TB working fine alongside 5 WD 750GB.
Note the drive makers number in decimal 1 TB = 10^9 bytes. Computers use k M G and T for powers of 2^10 = 1024. Thus a 750 GB is 697 GB for us and 1 TB is 930 GB. It is not a formatting loss, just a terminology problem. -Ken