Quote Originally Posted by Zap! View Post
If I burn a CD on my current Windows 10 computer, it will not read on my old Windows 98 Toshiba laptop. Now, CD's that I burned about 12 years ago read fine.
My guess is that they're not being "finalized", which is what would lock out further changes to the CD-R's content, and (essentially) turn it into the equivalent of a commercial read-only CD. There might be an option to do so somewhere in the options menu for Windows 10's CD burning software. Try enabling it, and see if newly-burned discs now work in the Win98 machine.
-Adam