There is a 320GB hard drive and a 250GB hard drive available for the 360 S consoles. Both of those units are installed inside the console.
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You can also go with a USB flash drive made by San Disk specifically for the Xbox 360. There are 16GB and 8GB options.
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If you have anymore questions regarding storage for your Xbox 360, please use this forum ---> forums.xbox.com/.../7.aspx