After you remove the tape, you'll need to remove the shiny plastic/chrome that runs around the case. You just have to pull it a bit and it will come off pretty easily. Once you do that you should be able to pull out the entire drive along with the controller that's attached to it on its backside.
The controller is attached to the drive by two screws. Just remove these two screws and you should easily be able to disconnect the drive from the SATA ports on the controller.
The drive that originally came with the Apollo is a Samsung HM500LI 500GB (8MB cache, 5400 rpm). I replaced that drive with a Seagate Momentus 500GB (16MB cache, 5400 rpm). You can use any 2.5" SATA drive. You could probably even use a drive that runs at 7200 rpm, but that will generate a lot of heat and the enclosure doesn't have any ventilation.