Hello! El Torito & isolinux test with qemu - 3.06 boots, BUT windows boot files can't be loaded. ISOLINUX 3.06 2005-01-10 isolinux: Image checksum error, sorry... Boot failed: Press a key to retry... - 3.07 boots and starts windows boot files in the second run. The first one gives: isolinux: Disk error 0C, AX = 4204, drive E0 - 3.08 boots und starts windows boot files in qemu - 3.09 boots und starts windows bootfiles in the second run. The first one gives: isolinux: Disk error 0C, AX = 4204, drive E0 - 3.10 boots, BUT windows boot files will not load and no error message occurs. - 3.11 boots, BUT windows boot files will not load and no error message occurs. used mkiso command: mkisofs -joliet-long -relaxed-filenames -r -l -d -D -N -J \ -p "$PREPARER" -publisher "$PUBLISHER" -b $BOOT \ -no-emul-boot -boot-load-size 4 -V "$VOLID" -no-iso-translate \ -c boot.cat -hide $BOOT -hide-joliet $BOOT \ -o $ISOFILENAME $ISOROOT Windows boot files are these files to boot up a windows NT installation. What did I wrong? What should I have a look at that my CDs work on most systems? When the BIOS gives an option to boot from CD is this not a sign that these CDs will work. I hope you can help me... Regards Andi PS: Is there a reason why Knopper uses isolinux 2.11 on the KNOPPIX 4.0.2 CD?