Yup. Not highly technical. You are trying to test drives attached to a true RAID controller. The RAID controller typically masks the RAW disks from the server except via a specialized access like the Dell Diagnostics Tools uses. Otherwise the disks are inaccessible. It entirely possible for you to attach 24 disks to the RAID controller and not map anything, and have the BIOS not see any disks. Once you do map the disks, they show up as RAID managed volumes even if you map 1 disk to 1 LUN.