FIX! I had the unrecognized disc problem for a while, tried all kinds of fixes and methods I found online and nothing worked. Until I found a fix that worked for me every single time. As soon as I enter the disc, I start to tap semi-hard on top of the ps4 around the area where the disc is until my playstation reads the disc. Works every time. I still have unrecognized disc issues if I don't tap on it. Please let me know if this works for you guys. This is a repost just in case someone didn't see my answer. Some people have told me it worked for them.