NAS Drive

[markwilliams82]

I'm after two new HDD's for a NAS unit (DNS-320L)

I was after either 3TB or 4TB per drive and was looking at the WD Red drives.
How do these rate and are there any alternatives?

 

[markwilliams82]

Oops, yeah TB was what I meant

Based on those prices, if I added a single 6TB now and then looked to add a second later down the line; how easy can this be done or how would it effect the setup of the NAS?