[RealStickman_]

In my opinion UDF [1] would be a great option. Although it's mainly used in DVDs, it can also be created as read/write capable. [2]

[1] https://en.m.wikipedia.org/wiki/Universal_Disk_Format

[2] https://duncanlock.net/blog/2013/05/13/using-udf-as-an-impro...