I think what Train meant Photolady was that you said he had a cdrom/dvdrom combo drive, and Train was pointing out that since a dvdrom drive should automatically read cds and dvds, a COMBO drive generally referred to a dvdrom with the ability to write cdrs/cdrws, ie a combo drive could read dvds and read/write to cdr/cdrwQuote:
Originally Posted by photolady
A dvdrom drive can read dvds and cds both pressed and burnt (cdr/cdrw), though some very, very early dvdroms could not read burnt disks.
If a dvdrom drive cannot read a cd but continues to read dvds, then the lens focus mechanism may be failing.
The recording surface on a cd is deeper than the recording surface on a dvd (ie a cd has a thicker transparent outer layer (substrate) covering the recording surface than a dvd), the lens has the ability to change the beams focus.
Of course, if the cd has been written to using packet writing the disk may need to be closed before it is readable in a cdrom or dvdrom drive.
