just been through this. see this link: http://www.knoppix.net/forum/viewtopic.php?t=13601
I think for your setup you will need a link from /dev/cdrom to /dev/hdc.
'ln -s /dev/hdc /dev/cdrom'
Problem is the icon is based on the 2.4 kernel setup using /dev/cdrom & the 2.6 kernel doesn't create /dev/cdrom which is a link to the actual device.