most important feature Knoppix should have, is a partition QUOTA by default

[sparxz]

The most important feature Knoppix should have(and does not have) is a partition QUOTA of remaining space limit by 'default', that stops a person trying to install more software and not realising that will lead to a not bootable installation, with no way to undo.
;)

[Werner P. Schulz]

You can boot with the cheatcode "knoppix noimage" and remove your persistent memory (file or partition). After reboot (without the cheatcode "noimage") you can create a new persistent memory; with the newest version of Knoppix you need the cheatcode "knoppix mkimage" for this.

Cheatcodes (http://knoppix.net/wiki/Cheat_Codes)