Cause

When attempting to eject a CD-ROM on a Ultra 450 system, the eject cdrom command fails, displaying the error message.

This happens when the CD-ROM is on controller 1, not 0. When using the eject(1) command, the CD-ROM "nickname" equates to /dev/rdsk/c0t6d0s2. On an Ultra 450, the CD-ROM equates to /dev/rdsk/c1t6d0s2. Therefore, using cdrom does not work.