Hi, Chris Lamb wrote: > Did you try the --invariant flag?
Well, i step aside and let this question reach Felix. :)) https://manpages.debian.org/unstable/dosfstools/mkdosfs.8.en.html says that this is what we need if my theory about the second difference is correct: --invariant Use constants for normally randomly generated or time based data such as volume ID and creation time. Multiple runs of mkfs.fat on the same device create identical results with this option. So the options to be added to the mkdosfs runs in the hope for a fully reproducible ISO are: -i 12345678 --invariant If a more more individual -i number is desired, one could use something like -i $(printf '%8.8x' "$SOURCE_DATE_EPOCH" | head -c 8) Have a nice day :) Thomas
