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Correct me if I am wrong but it appears from what you say that you have a Red Hat virtual appliance that is running under VMware player, and you wish to install virt-manager.

Unless you have a...

cdroms are not ext3, they are iso9660.

I have no idea where you got /dev/cdrom/media.

Just mount /media/cdrom0 ought to do the job according to your fstab.