With CD-brake, the user manually manipulated the speed of its CD or DVD drive. This feature makes itself useful, among other things, you want to reduce the noise level of the reader temporarily. In addition, a lower number of revolutions may improve the readability no longer knotless blanks. The factor by which CD-brake can reduce the speed of the drive, but is unsterschiedlich from model to model. It is also possible that some CD / DVD reader does not respond to the CD-brake. Here is just a test run, which remains financially consequences using the free helper in the negative case of success.