The Synology DS1511+ NAS server on CNET test bench.

You won't find any network storage device that offers more space than the recently reviewed five-bay DS1511+ NAS server from Synology.

This is the first NAS we've reviewed that has up to 15TB of storage space out of the box, by supporting the new 3TB hard drives. On top of that, when used with two DX510 expansion units, the server's storage space can be scaled up to be 45TB. With front-facing drive bays, it's easy to replace or add more hard drives to the systems.