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To format a storage device:
Start your Xbox 360 console without a disc in the tray.
- Go to the Settings hub, and choose System.
- Select Storage.
- Highlight the storage device that you want to format, and then press the Y button on your controller.
If you want to select your Xbox Hard Drive:
- Select Format. You receive the following message: This will delete all content on this device. Do you want to continue?
- Choose Yes to format the storage device.
- If you are asked to enter your console serial number, enter your number, and then select Done. This step helps guard against accidental formatting.