www.makemkv.com

I'm new to MakeMKV and am really loving it. I'm in the process of moving about 200 music concert films to a Plex server, and have been downloading some of the Blu-Rays and DVDs that I already own as a timesaver. The .ISO files are converting perfectly, but every single BDMV file that I convert fails. I've tried with about 8 titles so far that play perfectly via VLC but fail in MakeMKV.

I'm about to buy a BD external drive on Amazon, but before I do so, I just wanted to see if anybody has any suggestions on what else I can try?

Failing how? What exactly are you doing and what is happening?

I just posted to "Failed to install CdRom Device Arbiter Service". I had problems with 3 Blu-ray discs I tried and gave up. I had wondered if my problem was due to the CdRom install failure.
I note I have a new Pioneer Blu-ray player and am not experiencing problems with it.

And like the originator of this topic, you have refused to provide any information that could possibly lead to answering the question.

There are a number of ways disks can fail initially.