www.makemkv.com

Have just updated to the latest v1.12.0 but it can't find any suitable optical drives (I have 2) so I've had to revert to v1.10.7 - which does find the drives.
My distribution is Mageia6 - x64

You probably should read this topic: http://makemkv.com/forum2/viewtopic.php?f=3&t=16939

The subject is "Optical Drive not being found".

Answers as to why and how to fix are toward the end.