I know someone linked to Redump.org but I didn't see anyone link to the actual Sega CD dumping guide, this is different than the PSX dumping guide.

http://forum.redump.org/topic/4495/sega-saturn-megacd-dumping-guide/

Also [b:477e8c4577]if you're comfortable with this idea[/b:477e8c4577] you could always PM one of the staff of redump.org and ask them to dump the disc for you. I've never tried asking them before but I image they would be happy to help.