Provide a common access method for CD-ROMs
driver ... cdrom cdrom_options ... &
The cdrom options control the driver's interface to cam-cdrom.so for CD-ROM devices. If specified, they must follow the cdrom keyword:
The cam-cdrom.so shared object provides common access methods (CAMs) for CD-ROM devices.
cam-disk.so, cam-optical.so, io-blk.so
"Block-oriented drivers (devb-*)" and "Filesystem drivers (fs-*)" in the Utilities Summary
Connecting Hardware in the Neutrino User's Guide