Top secret disk

Top Secret Disks are collectible objects that appear in Shadow the Hedgehog.

Overview
The top secret disks, of which there are five of, are needed to be collected by the player in order to complete the Hero Mission in Prison Island.

While the exact contents of the disks are unknown, it would seem that they have something to do with Dr. Eggman, as the stage that comes after Prison Island if the player chooses to help Charmy is the Mad Matrix, where the Chaotix are investigating and hacking Eggman's computer data.