There is also an issue with laser power in reading cdrw's. The substrate used in CDRW requires more laser power to read the pits(data) properly. The CDRW even with a closed session recorded on it still will not play on some of the older players. CDRW compatable players have a self adjusting laser supply in order to read the data on a cdrw. Most of the older units just do not get enough laser beam back through the focus lens to get a good focus calibration. I have even had some CDRs (very cheap brands) that exhibit the same kinds of issues and will not play on all players, but play fine on the drive that they were recorded on.....
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