2. A hardware component within the computer used for (hopefully) permanent storage.
3. N00bish slang for the box that contains the hardware components.
2. There is no quicker way to explain what a useless duh-weeb you are, than to call the tower or desktop unit the "hard drive", regardless how many times you've been told that it isn't. It's no wonder tech support can't understand what you're telling them.
3. "No, it's not Fat or Inty-Effess. It's a Dell, dude!"