Best computer for old DOS games

[skaar]

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

Burn speed has a lot to do with it too (not sure why, but it's true)

If you're burning a lot of CDs for older machines then older CDR drives/media will produce more reliable results. A lot of newly manufactured CDRs don't seem to want to burn less than 24x though..