Floppix

Floppix

Floppix is a teaching tool; it is a very small subset of Debian/ GNU
Linux that fits on two 3.5" 1.4Mb diskettes. The current version is
derived from Debian 2.1 (slink), copyright under the GNU GPL
"copyleft". It provides a platform to practice linux commands and
experiment with simple system administration.
Floppix has no hard drive support; you cannot access, modify, damage
or destroy anything installed on the hard drive. For this reason,
Floppix works safely in the lab, at home or at work.

Floppix has no hard drive supportってのがすごい。なるほどね。