I'm trying to burn some large files to a DVD, and I seem to be running into curious problems with mkisofs. [root at cosimo dvd]# mkisofs -J -R -o gah.iso gah/ [... much deleted ...] 2251801 extents written (4398 MB) [root at cosimo dvd]# du -sh gah/ 1.7G gah/ It's just 13 300 odd meg files. Why is the ISO file so much larger than the original files. john