I would like to have my USB stick always ready as an emergency Live Ubuntu, but use it - in the meanwhile - as a
FAT storage media for file exchange between different computers (Win, Linux, Mac).
Is it possible (using Ubuntu 16.04 or newer) and how?
I have the feeling that, up to some versions ago, a USB stick created with Startup Disk Creator used to be readable and writable while not in use as a bootable drive.
However, a bootable drive that I've recently created with Startup Disk Creator on Ubuntu 16.04 doesn't seem to mount as a writable partition.
Indeed, it refuses
mount -o remount,rw,
chown to my user, and even reformatting of the free space (it reports a disagreement in the block size specification), which however – if I'm not mistaken – wouldn't be a proper solution as Windows doesn't read partitions other than the first.