When you take a look at the motherboard, you'll notice that there is a metal bracket with two screw holes holding the hard drive in place. The right screw hole may or may not have a screw preinstalled by the factory (ours did not), but the left screw hole is obstructed by a Mini PCI-e card which we believe is the Wi-Fi card.
In order to remove the hard drive, you will first have to move the Mini PCI-e card.

To remove the Mini PCI-e card:
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