chgrp device problem

[Bryan Harvey]

When I try and change the group of my cd-writer and dvd-writer drives and 
reboot, they are changed back.
They are currently set up in the group 'disk', but I want them to be set up 
as 'cdrom' so I can allow other users permissions to the drives.

Why does the groups keep changing after rebooting, and is there a way to fix 
this?

Thanks In Advance
Bendeco

P.S.
I'm running FC3 and my fstab entry for the two cdrom drives looks like this:
/dev/hdd                /media/cdrecorder       auto    
ro,noauto,nosuid,users,exec 0 0
/dev/hdc                /media/cdrecorder1     auto    
ro,noauto,nosuid,users,exec 0 0

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