I have an Intel NUC with 8 GB as media center and Hyper-V host for a test domain controller. I attached 2 physical external disks (1x 2,5″ USB 3, 1x 3,5″ USB 2) and created a storage pool. A couple of weeks later, I bought a new 2,5″ USB 3 disk with 1 TB to replace the older USB 2.0 disk. That disk is a lot quieter than the older one.
When I was installing Exchange 2013 in my home lab, I received an error message on 98 %. You will see the screen below for 15-20 minutes.