JHN,

If you are using knoppix from the cd, where are you storing the your .iso file before it is burned? K3B might just be using ram and you might be running out of it. I would suggest mounting a hard drive, putting your iso file there first, and then burning it.

You can also use the command line to burn your files, but likewise you will need to create the .iso file on one of your mounted hard drives (whether it's on your local machine or on a network drive) and then burn it.

Here's how to do it from the command line.

FIND YOUR CD BURNER
Code:
cdrecord --scanbus
The output will look something like this:

Cdrecord-Clone 2.01a19 (i686-pc-linux-gnu) Copyright (C) 1995-2003 Jörg Schilling
Linux sg driver version: 3.1.25
Using libscg version 'schily-0.7'
scsibus0:
0,0,0 0) 'TEAC ' 'DW-28E ' '1.0A' Removable CD-ROM
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *


So in this case your burner would be located at: 0,0,0

MAKE THE ISO IMAGE

Code:
mkisofs -J -r -o name_of_new_iso_file.iso /path/to/your/files

BURN THE IMAGE

Code:
cdrecord speed=4 dev=0,0,0 -v -pad -eject file_to_be_burned.iso
This should take care of things for you.