Hi. not much knowledge with computers. I'm trying to learn but gets a bit confusing at times so bare with me. I'm trying to view/access files from my cctv that may have been deleted. The hdd still works in dvr. On the dvr I can view files on days system was recording. There's a couple day is shows no recordings. When I looked at system log its shows that a user modified those days which leads me to believe they were deleted on purpose. I purchased a sata adapter to connect dvr hdd to my hp laptop. Problem I'm having is laptop won't access files. It shows up as ext hdd *connected to usb 3.0 in devices but does not show up in files. It also shows up in disks and volume and disk management as unallocated. Gives me options to convert to dynamic disk or mbr. I don't want to reformat hdd because I do intend on using it in dvr again. I just want to view files on pc and possibly recover lost data. I've seen recovery sites but they want to charge a small fortune which i do not want to pay especially if recovered files show nothing, Is there any other way of retrieving this lost files.