As root, you can unmount the CDROM with
      /sbin/umount /cdrom, take it out of the
      drive, insert another one, and mount it with
      /sbin/mount_cd9660 /dev/cd0a /cdrom assuming
      cd0a is the device name for your CDROM
      drive.  The most recent versions of FreeBSD let you mount the
      CDROM with just /sbin/mount /cdrom.
Using the live filesystem—the second of FreeBSD's
      CDROM disks—is useful if you have got limited space.  What
      is on the live filesystem varies from release to release.  You
      might try playing games from the CDROM.  This involves using
      lndir, which gets installed with the X Window
      System, to tell the program(s) where to find the necessary
      files, because they are in the /cdrom file
      system instead of in /usr and its
      subdirectories, which is where they are expected to be.  Read
      man lndir.
All FreeBSD documents are available for download at https://download.freebsd.org/ftp/doc/
Questions that are not answered by the
    documentation may be
    sent to <freebsd-questions@FreeBSD.org>.
    Send questions about this document to <freebsd-doc@FreeBSD.org>.