I am not certain but I think that you need two entries in /etc/fstab for a DVD/CD-RW. Check /etc/fstab in your Mandrake system and see if it has two entries for the DVD/CD-RW. If so then try duplicating the second entry in your Red Hat /etc/fstab.
As a second possible fix: If your Red Hat and Mandrake systems are on the same machine then read the information into your Mandrake system and then copy it to your Red Hat partition, assuming that you have enough disk space on your Mandrake system for a temporary 16G file tree.
Another thought: If your Red Hat and Mandrake systems are on the same machine then boot Mandrake, mount the Red Hat partition on a temporary directory in Mandrake, mount the DVD and then copy the DVD to the Red Hat partition.
If Red Hat and Mandrake are on separate machines then you could temporarily move your Red Hat hard disk to the Mandrake machine, copy the DVD to the Red Hat disk, and move the Red Hat disk back where it belongs.
Come to think of it 16G is three or more DVDs.
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