I have purchased a synology ds409 from newegg.com and four 1.5 TB hard drives.
The hard drives show up as 1.36TB, and when i formatted them into a single RAID5 volume, i only have 4TB total on the volume.
Where did the other 2TB of space go? i know some went to the raid config, but why does only 1.36 show up? That's like 140 x 4 = 560GB's.. thats a ton of drive space that is missing.