Instructions
Power on the Xbox 360 video game console. Remove any game or video discs.
Select "My Xbox," then "System Settings" from the main menu. Choose "Memory."
Select the Xbox's internal storage device, press "Y."
Choose "Format." Confirm the action. You may be prompted to enter the serial number, as part of the confirmation process. The serial number can be found on the back of the console.
Click "Done" to erase and format the Xbox drive.