DS218+, I think I have to 8TB drives in there. I saved some money on the drives waiting for the WD Easystores to go on sale. There is a guide somewhere that tells you which ones come with the Red NAS drives. I was 2 for 2. I was planning on using an older machine I have here and one of the free solutions and I'm glad I didn't. I have too many things to tinker with as it is. This does what I want, easy storage from any machine on my network and remotely. And Plex. 4k video is a little sketchy, I'm not sure what the bottleneck is. It worked until I put subtitles on. Could be the Xbox, could be the network. I haven't messed with it enough.