I've been getting the same message, different numbers on a remaster of KNOPPIX 3.3 that I have been trying to do.

I sucessfully remastered KNOPPIX STD (KNOPPIX 3.2) successfully in the same environment 8 hours before.

I have two versions of KNOPPIX installed on my H/D 3.2 and 3.3. There are some minor glitches in either install, so I bounce back and forth between them.

I suspect it is either the compress-fs or cloop or combination thereof and haven't had a chance sort it all out. The later number seems to be close to the overall file size on my broken. I need to check the versions of the compression and the cloop.