If you are running the Knoppix live cd/dvd and run into the following error:

Can’t find knoppix filesystem, sorry.
Dropping you to busybox shell.
Press reset button to quit.

there are two things you can try.

  1. As per the Knoppix FAQ, try booting with the knoppix nodma option.
  2. Alter you computer’s BIOS settings and change the “Configure SATA as” setting from IDE to AHCI.