Ensure SD card has been properly written
Some SD cards when old/damaged silently switch to read-only without warning, accepting any write but not actually writing it.
Given the weakness of SD cards, users might encounter this issue and believe the process succeeded completely while it has not.
We could check for the presence/content of a specific file on the SD card to ensure it has been written. It would require mounting the SD-card's third partition on the host to check it.
An alternative solution would be to create a file on that partition with the Image creation Date and document it as a test.