So, is there no way to exclude certain drives from appearing under mounttool?
I have looked for such an option as well, because clicking on the "fd0" button in mnttool without a floppy drive available gave me a hanging process "sh -c sudo mount /dev/fd0".
mnttool uses the script "/usr/bin/mountables.sh" to construct the list out of "/etc/fstab" and writes the data to temporary file "/tmp/mountables".
So changing line 9 of named script as follows excludes the floppy-button from being presented:
< echo "$DEVICE"~"$LABEL" >> "$LIST"
---
> [ ${DEVICE:0:2} != "fd" ] && echo "$DEVICE"~"$LABEL" >> "$LIST"
Tinycore is keen on reverting modifications like this on reboot, so to keep it permanent the script should be added to the personal backup filelist. But be warned, this might conflict with future changes in case of an upgrade.