SuSE 8.0 Custom CD doesn't install packages

Hi all, After a fight lasts with a script to make a du.dir file compatible with my custom installation, I'm having another problem: the installation starts normally, also with my custom package selection. But when it goes to initiate the packages copy, I receive the following message: "Could not mount the source medium. mount: /dev/hdb already mounted or /var/adm/mount busy mount: according to mtab, /dev/hdb is already mounted on /var/adm/mount". Comparing the original du.dir file and my generate file, apparently it's equal (structurally). Someone have some idea ??? Regards, Fabiano