I am using MagicISO to add files to the Bootcd.iso file. When I burn the
file to a cd and boot my system I get a checksum error. The exact
message is "isolinux 2.06 2003-08-22 isolinux: Image checksum error
boot failed:"

How do I modify the checksum when modifying and burning a disk??

I have talked with the MagicISO folks and they suggested modifying the
volume serial number was the answer. It wasn't.