Do CD-R's play on your player? If no, why not?

My Cal Icon plays cdr's just fine
but my older Nakamichi OMS-5 and Cal Aria do not
Seems newer machines can handle and track the poorer cut cdr's. Haven't tried any on my Toshiba dvd player

When burning a cdr you must close the session before it will play. Some software allows for the burning of the disk and leaving it open so that you can add more at a later time. I don't think cdrw's will play on anything except computers. probably due to the fact of not being closed. I play cdr's on my Theta Miles and a Magnavox cd650 (circa 1988) with no problem. Remember it must be burned as an audio disk. Audio cd's are no different than standard cd's. Make sure you don't use el cheapos. Color doesn't seem to be a big factor anymore either. Here's some good links for cdr info
http://cdrfaq.org/
and
http://www.cdmediaworld.com/hardware/cdrom/cd.shtml

FWIW, My Marantz CC-47 plays CD-Rs just fine. Never an issue with me. I've used both el-cheapo $0.10 USD blanks and expensive stuff without issue. Maybe I've just been lucky? The Marantz CC-47 is a 5 disc carousel, BTW.

And as others have mentioned, both DVD players will NOT play CD-R discs.