I have Seagate momentus external USB hard disk (sata) which isn't working. I suspect the motor is jammed and needs placing in the resting position. So I've removed the plastic casing and have removed all of the screws on the top of the drive (the metal sheet side) but I can remove it. It's stuck at one end, something is still attaching it. I know on some hard disks there is an extra screw under the label but I have removed and there isn't. I've ended up trying to pries it open but then thought better off it as I don't want to damage it if there is a proper way of doing this. Other SATA drives I have opened up just unscrew, I've not seen this before. Any pointers would be most appreciated.