The drive is not held to either side, so be careful when separating the case.

At this point, all the snaps have been broken or separated. So grab the two sides near the front of the drive and begin to separate them. As you do so, make sure the snaps on either side stayed separated, if not, take the metal spudger and use it to re-separate either side.

Once the sides are separate the board containing the drive will be free. There are no screws holding the drive and its board in place, instead opting for some vibration dampening rubber feet on either side of the drive.

Pull the board and drive free from whichever side then ended up in. (see picture 1)

No more snaps after this point :)