Thanks Don.
I contacted Swann, sadly the technical support lady kept on putting me on hold and probably googling the answer. Told me it is either FAT32/NTFS (which it isn't). My guess Linux. I used a Drive Clone Dock to make sure I had a copy of the drive then tested both inside the DVR unit. Both worked fine so I now have the files forever while the unit has been returned to the shop to continue recording (and overwriting). If I can't get it to work without the unit I may just buy a second unit and sit there and run through the footage via the machine (which is a pain). I'd prefer to somehow get it onto the a PC and then sit and run through the footage with my own software.
I'll wait a bit, maybe someone knows if there is a way. I have the data safe at least which is the first priority.
I read somewhere Ubuntu with XFS package is the go (EXT3/4) - I'll try that first with an old laptop and see if there is any success. I know the data is there, but for sure not FAT32/FAT/NTFS. What the support person was probably searching on was what drive format you want to hook up to the external USB port of the unit.. Not the internal Hard drive... which gives me an idea for the future. Can an external hard drive be used instead of the internal hard drive and if so will it store the files in a format that can easily be accessed by a PC.
Fun times ahead.. but I am determined.