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Find out what group own the cdrom device. /dev/cdrom is most likely a symlink to the real device. you can check it by:
ls -l /dev/cdrom
output should be something like:
lrwxrwxrwx 1 root users 3 Aug 5 17:59 /dev/cdrom -> hdb
and then following the symlink
ls -l /dev/hdb
If both owner and group are root, then you might want to change the group to users (or a group which has your user in it)
chgrp users /dev/yourDeviceHere
You may need to logout first. From what I see here, anyone in the users group should be able to read/write directly to device /dev/hdd (the second group of rw), and thus enable MPlayer to use the vcd option to directly read from VCD (w/o mounting it first).
You might also try to change the permission to 666:
chmod 666 /dev/hdd
This gives access ti everyone including users other than root and users.