On Wed, 3 Apr 2019 22:15:10 +0000 (UTC), Isidore Goresky
wrote:

I want to burn a CD (700MB) for an old 2002 car cd player for a friend.
I have about 30 MP3 files (150MB).

ImgBurn is asking to choose between iso9660 udf or joilet.

Which do I pick?

What happens when select the MP3 (all) files and burn them to the CD?
Don't know the ImgBurn program.