www.makemkv.com

There was another thread on this with a different fix, go to Window Security -> Ransomware Protection and either disable it or add an allowed app

For me the problem occurred on Win10 after an update from MS which added Ransomware Protection. To make the optical drive's visible again I could either disable the Ransomware Protection completely or just add the Makemkv exe files as an exception. I chose the later option and now Makemkv works aga...