The SCSI adapter may not be supported by the Knoppix kernel. ou could try the cheatcode knoppix26 to see if using the 2.6.x Linux kernel will support the SCSI adapter. You need to find out the manufacturer and model number of the SCSI adapter (even if it is a chip on the motherboard). There is no other way we can help you without knowing the specs & details of your system. You need to search either this forum or google and see if anyone else has had issues with that SCSI adapter.

Good luck.
James