I couldn't write a single CD from the 25-pack on 2 laptops. On an old 20-year-old desktop, they write normally with the same program that I have on my laptop. I don't know what to assume. I bought them from the same store where I bought a dozen, which were written perfectly on my laptop. The dozen had a different packaging. Maybe the newer ones are not the same? I can't explain it, the only reason I use CDs is to listen to them in the car.