The drive doesn't recognize Heroes of Might and Magic V Silver Edition.

I also think that a dual-layer disc would be suitable – it could hold the regular Heroes 5, Hammers of Fate, and perhaps some bonus mission for the 10th anniversary of Nival Interactive. But its size isn't being displayed:( the drive says the disc is empty and even offers to write something to it. It's strange – the drive reads dual-layer discs perfectly, including those from Igromania. Thanks for the answer, I'll think about it.