I have a SATA Express SSD and I'm [sic] of it - HDD's & SSD's - Level1Techs Forums
T460p CAN use the M.2 2.5 caddy from the T470p to connect any PCIe M.2 2280 to the 2.5 slot. : r/thinkpad
1TB HDD NGFF M2 2242 SATA SSD Solid State Disk for ACER HP Elitebook 850 G1 820 G1 Sony Lenovo thinkpad T460p,T540p,W540 GPD Win 2 Win 1 : Amazon.ca: Electronics