Not reading MRM DVD-R; why?

Dear Common Wisdom:
Why wouldn't my MacBook Pro read a MRM DVD-r?
Any ideas?
Thanks,
Kostas

Okay, thanks to everybody for listening. In the meantime, I installed an used slimline CD-ROM but the notebook still would not boot from it. It does not make a difference if I set the boot range in the BIOS to cdrom first or if I press "C" during boot.
In the meantime I found a very interesting FAQ (sorry, German only) about buying and replacing slimline drives for notebooks:
http://www.tks-computer.com/files/Slimline-FAQ.PDF
There is stated that there are numerous variations of the firmware of those drives, the most important difference slave or master. They even show a way how to re-solder the pins to make slave or master, but I did not bother to invest another 2.5 hrs to try it. I even think slave/master is not my problem; in my desktop computers, a master jumpered drive where a slave is expected, or vice versa, would not run at all. Maybe I will be able to cheaply purchase from Ebay a damaged, identical notebook for original parts sooner or later.
The work was not useless, however, because after I made the four start floppies for Win2k on my desktop PC, the CDROM has been recognized, which has not been the case with the DVD-RW which was installed previously. So, I was able to install my Win2k and now have a working notebook.

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Not reading MRM DVD-R; why?

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