I just upgraded my Lenovo B50-70 with an SSD. Then I moved the original HDD (let's call it HDD1)to a DVD caddy, to use as main storage for data, music, etc. No way I could make it work. I mean, I tested 3 different caddies. The HDD1 is not seen even by BIOS. Actually this HDD1 works just fine...tested on different machines connected via USB, no problems at all. Those caddies are really poor quality, so first I thought about a defect even if 3 all defective seems not likely. So to make another test I put another HDD (coming from my wife's laptop now upgraded to SSD too, I call it HDD2) in the caddy: perfectly detected by BIOS. This is something I do not understand....the only difference between the to HDD's are: thickness (HDD2 is thicker) and rated transfer speed (HDD2 is 3Gb/s, while HDD1 is 6Gb/s). At the end, I simply swapped the two, re-cloning my wife's laptop on HDD1 and mounting HDD2 on my B50. Any idea? Thanks EDIT: found the culprit. The HDD2 is Sata II and I am pretty sure the DVD bay is Sata II so maybe it could not detect the Sata III HDD1. Maybe I should try with another HDD Sata III.