The external harddrive is formatted in an open source Linux file format called ext3. I can mount my external dish haddrive on my linux OS machine and open the harddrive and the folders and view the folder content. Using a hex editor I can view the files in hex format. So far I have not figured out how to convert the video file to a format I can play in a video viewer as I just started this project.
However if you have windows there is a way of looking at ext3 formatted drives from windows, so hope this helps you further in this quest.