Instructions
Turn on the Xbox 360 and navigate to "My Xbox" on the dashboard.
Go over to "System Settings" and press the "A" button. This displays the "System Settings" menu.
Select "Memory" and press the "A" button. This loads a list of storage devices.
Select the storage device to highlight it; press the "Y" button. This loads a "Device Options" screen.
Choose the "Clear System Cache" option and press the "A" button. This loads a "Maintain Storage Device" confirmation screen. Select "Yes" and then press "A."