Hi,

I suggest you boot Knoppix off the CD and use the command lsmod to find out which kernel modules are to be loaded for your SCSI adaptor.
These kernel modules have to be offered to the Knoppix kernel at boot time before it can access your SCSI HDD. The usual way to do so is to create an initial root disk and configure the boot loader so that the kernel loads it.
There are tools in the Debian distribution which help you create the initrd.

On the other hand, you could compile yourself a Linux kernel which includes the kernel modules needed by your SCSI adaptor.