Did CDROM readers changed file formats?”
The formats haven’t changed. The best advice anyone could give you would be to attempt to read the discs in different drives on different computers… you never know, you might get lucky. This is from the Wikipedia article on CD-Rs. Note the sentence “Unfortunately, some common practices can reduce shelf life to only one or two years.” At present, stated CD-R lifetimes are estimates based on accelerated aging tests as the technology has not been in existence long enough to verify the upper range. With proper care it is thought that CD-Rs should be readable one thousand times or more and have a shelf life of several hundred years. Unfortunately, some common practices can reduce shelf life to only one or two years. Therefore, it is important to handle and store CD-Rs properly if it is necessary to read them more than a year or so later. Real-life (not accelerated aging) tests have revealed that some CD-Rs degrade quickly even if stored optimally. Burned CD-Rs suffer from material degrada
