For reasons too embarrassing and frustrating to blather about, I am the proud owner of a Dell MD1200 enclosure and 12 ST4000NM0014 4TB Seagate drives (short story: I thought they were ST4000NM0023's, which work fine in our enclosure). The drives ending in 14 are 12Gbps and almost identical to the drives ending in 23 except the latter are 6 Gbps.
The drives show as 475Gb capacity on our R620 with Dell PERC 810 (and, incidentally, a LSI 9280-8e RAID controller that I've tried). Can I use my 12Gbps drives on my 6Gbps MD1200 or is this simply not going to work?
The drives show up as 475G on the BIOS configuration screen too, so I'm sure it's not an O/S problem (happens to be CentOS 7.2, but again that's not in play here).
The BIOS is 2.5.4, the MD1200 firmware is 1.06. I tried to update the 9280-8e and my version is higher than Broadcom's, and I think but I'm not sure that the PERC's firmware is the latest.
I don't want to waste too much more time; I know it's not officially supported but maybe someone out there knows that it's foolish to even try...