Things You'll Need
Instructions
Look at the back of the Xbox 360. Find the serial number and write it down. Open the Xbox 360 enclosure. Insert the replacement hard drive. Connect the SATA and power cable to the enclosure. Close the enclosure.
Replace the enclosure onto the Xbox 360. Power on the console.
Press the Xbox button in the center of the controller. Scroll to the "Settings" pane. Select the "System Settings" option. Press "A."
Select the "Memory" option and press "A." Select the hard drive and press "Y." Select the "Format" option and press "A." Enter the serial number. Press "A." This will format the new drive to FATX and make it usable.