Xbox 360 Slim 20GB Hdd Internal Hard Drive . Condition is Used. Shipped with USPS First Class.  We removed a 20GB Hard Drive from an older XBox 360 and placed it into this Slim Hard Drive case!  On the inside is an OFFICIAL 20GB Microsoft XBox 360 Hard Drive.  That means that you will be able to play older XBox games with this hard drive (see compatibility list on XBox's website).