Can I upgrade Lenovo Z51-70 laptop's HDD from hybrid to SSD? - Quora
Solved! - LENOVO Z51-70 replacing DVD/CD drive with SSD with caddy not recognised by BIOS | Tom's Guide Forum
Amazon.com: 9.5mm 2nd HDD SSD Caddy for Lenovo IdeaPad Z40 Z400 Z500 Z510 Z710 Z50-70 Z50-75 Z51-70 Z50-70 Z50-70 DVD Drive Optical Bay Second Hard Disk Enclosure : Electronics