www.makemkv.com

Thanks. I will try it tomorrow on my Windows box.

I just discovered this thread here while looking for why my external Verbatim Blu-ray drive can't read 4K UHD discs. It is also a Pioneer BDR-UD03 drive.

Here is the drive info:

Drive Information
OS device name: /dev/sr0
Current profile: BD-ROM
Manufacturer: PIONEER
Product: BD-RW BDR-UD03 ...