I'm working on a backup-to-optical-media program that traverses a file tree and adds files to UDF images (mkisofs is the backend) to burn to optical discs, splitting large files into chunks across separate images as necessary. As such, I have complete control, to the byte, as far as how much data to include in each UDF image.
How do I calculate how much space to leave in a UDF image for filesystem overhead?
Experimentally, I've arbitrarily chosen 5MB for 25GB Bluray images and haven't had an issue yet, but I have no evidence that 5MB is efficient or sufficient for all cases, for example, UDF images with a very large amount of small files.
I'm using UDF 1.02.
