Net install for F18 Crashes -- Can't remove CDROM

[Jonathan Ryshpan]

I have just downloaded Fedora-18-x86_64-netinst.iso and copied it to a
memory stick and also to a CDROM.  Booting from the memory stick causes
the system to crash; it emits a message saying 
        Try dmesg | tail
        dracut/ #
or something similar.  The CDROM just drops back into a reboot, except
when run in VGA mode, when it behaves like the memory stick.

Now the CDROM can't be removed because it has been opened by
nepomukserver:

        $ lsof | fgrep /media
        nepomukse 3801      jonrysh   25r   DIR   11,0      2048     1856 /media/Fedora 18 x86_64
        nepomukse 3801      jonrysh   26r   DIR   11,0      2048     2176 /media/Fedora 18 x86_64/EFI
        QThread   3801 3807 jonrysh   25r   DIR   11,0      2048     1856 /media/Fedora 18 x86_64
        QThread   3801 3807 jonrysh   26r   DIR   11,0      2048     2176 /media/Fedora 18 x86_64/EFI
        QInotifyF 3801 3809 jonrysh   25r   DIR   11,0      2048     1856 /media/Fedora 18 x86_64
        QInotifyF 3801 3809 jonrysh   26r   DIR   11,0      2048     2176 /media/Fedora 18 x86_64/EFI
        
Killing nepomukserver (process 3801) just gets it opened again by
another instance.

Any help or advice about either of these troubles will be very welcome.

BTW: I have got the CDROM out of the drive by logging out as myself,
logging in as root, and then ejecting the drive.

FOO - jon