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if you do, after the completing the test - it will eject the CD.
and how are you going to reinsert the CD to complete your install? you're remote remember ??
As leppie says, a reboot should also fix this. Unless it's a laptop or slot style CD drive, it should be closed during POST.
redShadow's answer +1
eject -t to close the tray, but the md5sum is the better method. You can get the md5 key from the distro site.