I just got my external DVD player yesterday and I am planning to rip my DVD collections into digital form. This is my first time ripping a DVD disc, also my first time using MakeMKV.
MakeMKV can read the disc, but after a few seconds the ripping process started, the drive disconnected with errors like
Error 'OS error - This device does not exist' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '0'
Turned out my DVD player didn’t get enough power to spin the disc, so it disconnect itself. Thanks to this forum post which helped me identifying the problem.
I was using the DVD player on USB hub. So I pulled it out and put it into USB port at the back of my PC. Now problem is solved.