Slots are no an issue. Just because the smaller the drive, the cheaper I pay per TB.
Example:
1x 10TB = ~$450
10x 1TB = $15 per TB = $150

So if I ever plan to expand, I would prefer the 1TB drives as they are much cheaper.
I come from a world of Mh/s per second, so it burstcoin all about read speed per second? I'm going to use GPU for plotting and scanning (hopefully I'm using the right words haha).

Thanks!