Why a moving console can mark a disc
Inside a disc-based console, the drive grips the disc near its center and spins it while a laser reads data from its surface. The disc needs a small amount of clearance around it, but it is not held flat across its whole area. If the console is tilted or jolted while the disc is spinning, the disc can wobble and its edge or surface can rub against a stationary part inside the drive.
How the scratch becomes a circle
The damaging contact does not need to travel around the disc. If one fixed part of the drive touches the disc at a particular distance from its center, the spinning disc carries that contact point around again and again. The result can be a circular scratch at a consistent radius.
That repeated rubbing is why a brief movement can leave a conspicuous mark: the disc may make many rotations while the contact lasts. A scratch can interfere with the laser’s ability to read data, potentially making a game or movie unreliable or unreadable.
Keep the console still during playback
The risk depends on the drive’s design and how much the console moves; simply changing its position while it is off is different from tilting it while a disc is spinning. To avoid a preventable scrape, place the console where it can stay level and still until the drive stops.
