"_private_data_" What does this mean?

[Glenn54]

Hello all. I recently reformatted my computer and re-installed my MakeMKV software with my license key. One thing I'm noticing now is that once I rip a Blu-ray movie to my designated folder, there is an additional folder that show's up listed as "_private_data_". Never saw this folder before, so I'm not sure if I set something back up improperly

[Woodstock]

It's where MakeMKV stores a variety of files, including the latest list of data for extracting UHD titles. It is constructed as-needed, so it will often update when you start MakeMKV.