- you mean a SATA3 SSD to the 2.5 position - a high capacity 2.5 inch spinning hard drive in the ultrabay - an mSATA SSD in the mPCIe slot it's not m.2

I had a similar setup in my T420/T420s (I moved to the T420s when the first full HD boards didn't work well for the T420 and then came the sudden thaw in the keyboard winter, the ThinkPad 25).