Amazon.com: Replacement Hard Drive HDD SSD Caddy Frame Bracket for HP EliteBook 820 840 845 850 855 725 740 745 750 755 G3 G4 ( Not fit G1 G2 Model or Any Other Model ) : Electronics
HP EliteBook 850 G1 15.6" Laptop i5-4200U - Windows 10 -
Can we put both an HDD and an SSD in an EliteBook 840 G3? - Quora
Solved: HP Elitbook 840 g1 - SSD M.2 slot - HP Support Community - 5576316