I'll note that the T460p can also take an M.2 2242 format SSD in the WWAN slot. It's short (42mm not the normal 60+) and Transcend appears to be the main manufa

I'll note that the T460p can also take an M.2 2242 format SSD in the WWAN slot. It's short (42mm not the normal 60+) and Transcend appears to be the main manufacturer for SSDs in the 2242 format. Up to 512GB, and of course since it's the WWAN slot you lose the ability to have a cell radio in there. Reportedly a little fiddling in the BIOS to get it booting from the M.2, but I'd expect that to be the normal question of setting the boot order.