Chris writes “Well, we have seen this before – or have we? This project is not unique in terms of mounting a viewing window on top of the hard drive, but what makes this project stand out is the detail of it and the full description on how you should actually do it. And it comes with thirteen highres pictures. Not to speak of the end result. Wow!!! Very nice end result! And oh, did I mention that this hard drive is fully functional after the surgery?” Link.
Make a plexiglas hard drive window