BluRay ISO
MakeMKV isn't going to create an ISO. It will make a copy of the contents, optionally decrypted, which can be played like a BD, but it isn't an ISO.
Blu-ray to ISO
Back up your files and create ISO copies with Tipard Blu-ray Copy. This software allows you to clone your Blu-ray files or folders without ...
How to Rip Blu-ray to ISO File on Mac and Windows?
DVDFab Blu-ray Copy for Mac and Windows is a powerful and reliable software tool that enables you to easily copy Blu ray discs to ISO image files. Best Tool to Rip Blu-ray to ISO... · How to Rip Blu-ray to ISO on...
BluRay ISO : rmakemkv
Makemkv doesn't make an ISO natively for Blurays. However you can use another tool like say imgburn to turn the folders ig outputs into an ISO ...