Once I figured out which side was being saved, I opened the disk image in FDSExplorer and looked at the file. Metroid was almost unique among the games I looked at because it saves to both sides. Nestopia tells you when a disk is being read or written, so I just played until there was a save. So the first thing I had to do was to observe which side was being written. Sometimes the save file has an obvious name and is so small it could be nothing else, but for other games it is not so obvious. What made this much easier was the fact that Famicom Disk System games always seem to save to the last file on a disk's side. I used Nestopia UE 1.46 and FDSExplorer 1.63 and my favorite hex editor. Restoring a Famicom Disk System game to a pristine state is more than just deleting or zeroing out the last file. I have always wanted a tool or utility that could take these disk images and do just that, but since none exists I decided to investigate the images and try to fix them myself. Unfortunately, for most games there is no way to restore the game to a pristine, never-played state within the game itself. A lot of Famicom Disk System dumps of games that save information to disk have information saved to disk like save games, high scores and worlds/rounds/levels/games beaten.
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