SUBSYSTEM=="block", KERNEL=="fd[0-9]", GROUP="floppy"
# cdrom
-SUBSYSTEM=="block", KERNEL=="sr[0-9]*". GROUP="cdrom"
+SUBSYSTEM=="block", KERNEL=="sr[0-9]*", GROUP="cdrom"
SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="4|5", GROUP="cdrom"
KERNEL=="pktcdvd[0-9]*", GROUP="cdrom"
KERNEL=="pktcdvd", GROUP="cdrom"