Once the two small ribbon cables are out of the way, you can again use a plastic spudger to help remove the hard drive from it's location by gently prying it out.

Once the hard drive is free from it's holding location, gently disconnect the SATA cable from from the hard drive.

Remove the rubber ring from the hard drive by gently pulling. It is not secured to the hard drive other than by rubber pieces that go where screws might normally go.