I am running 4.2a ultrix on Decstation 5000/240's. I am trying to mount the cd drive on the file system. mount -t cdfs -r /dev/rz4c /cdrom However, I get the message cdfs_mount: Unknown descriptor type. Am I missing something? I have the two lines in the configeration file that are required for cdrom operation. cdfs_mount exists in /bin, and I get the same error if I directly use the command cdfs_mount. Thanks, leslie gordon