What makes a copied disk different from the original disk? [closed]

Closed. This question is off-topic. It is not currently accepting answers.

---

开发者_Go百科

Want to improve this question? Update the question so it's on-topic for Stack Overflow.

Closed 11 years ago.

Improve this question

For a reason, when we create a backup of our game disk, there is always a difference between the original disk and the self-burned backup. A lot of games can detect that the disk, inserted in the optical drive isn't an original one.

The game isn't satisfied neither with a virtually mounted image file.

So what makes the difference and how does the software detect it?

Thanks

Maybe this is a superuser.com question, but I'm not sure...

---

Copy protection schemes involve putting features on the manufactured disk that are difficult or impossible to create using a consumer recorder. One common technique is to put deliberate errors on the disc. See the Wikipedia article on CD/DVD copy protection for more information.