Synology Inc. on Twitter: "Our RAID calculator has been updated to allow for 6TB drives-Calculate your storage needs here http://t.co/tVM5xO5HbO http://t.co/LkpH588Ipz" / Twitter
RAID Types (Levels) Reference
RAID Calculator | RAID Performance Calculator
RAID Calculator - Server Case Blog
RAID Calculator - ICC
RAID 1: All Things You Should Know About RAID 1 - EaseUS