Unclick the black bar connecting the orange hard drive cable to the bottom of the hard drive. Gently push towards the bottom of the device on the black bar until you hear a click sound, it is now disengaged from the hard drive.
Now gently pull the orange hard drive cable to remove it from the hard drive.
Lift the hard drive from the device.
Hard Drive Replacement Only: Check to make sure the hard drive cable is in good condition and then connect the new hard drive in the same place, following the steps in reverse order.