Under some certain conditions there might be entries like the following in /etc/
fstab (the "/mnt/..." option is missing):

# Added by GRML
LABEL=TESTSTUFF ext3 # noauto,user,dev,suid,exec 0 0 /dev/sdb8
# Added by GRML
LABEL=MIKAUSB vfat # noauto,user,dev,suid,exec 0 0 /dev/sdc1

This does affect only *new* generated entries - so definitely no data damage. 
But there seems to some race condition on any stage between "plugin new device -
> scanpartitions/rebuildfstab -> /etc/fstab".