Step 4: Replacing the Hard Drive
Take your Xacto knife or razor blade and remove the tape and plastic bumpers from the hard drive. Be careful not to damage the ribbon cable in any way. Now remove the connector from the hard drive pulling slightly from one side and then the other until the pins come out completely.
Now take your ATA compatible CF card and plug into the HD connector "face up" just like the hard drive.
You don't need the rubber bumpers or tape but you will need a small piece of double sided foam tape to attach the card to the motherboard and keep it from rattling around inside your Mini.