The Xbox 360 makes use of a detachable hard drive that allows you to take your saved data from console to console. While the Microsoft hard drive looks unique, inside it is a common, 2.5-inch SATA hard drive, the same type found in laptop computers. You can upgrade the capacity of your Xbox hard drive by installing a new 2.5-inch SATA laptop hard drive.
Turn off your Xbox console and remove the hard drive. On the left side of the console, where the hard drive is located, there is a hard drive release button. Push that button and lift out the hard drive.
Use the T6 Torx scredriver to remove the four torx screws on the bottom of the hard drive. A Mircrosoft logo is covering one of the stickers. Removing this sticker will void your warranty. Proceed only if your Xbox is no longer under warranty or if you do not mind voiding your warranty.
Lift off the hard drive cover to reveal the internals of the hard drive casing.
Use the T10 Torx screwdriver to remove four more Torx screws connecting the metal shield to the hard drive. Set aside the metal shield once the screws have been removed.
Disconnect the power and data cables and slide the hard drive out of the case.
Slide in the 2.5-inch SATA notebook hard drive, connect the power and data cables and reassemble the hard drive case.
Connect the hard drive to your Xbox.
Power on your Xbox and go to the "System" menu in the Xbox Dashboard.
Select "Memory," view the "Storage Devices" and select "Hard Drive."
Press the "Y" button on the controller, select "Device Options" and click "Format." This will clear all of the data on your hard drive and format it so that it will be compatible with the Xbox 360.