If you've downloaded a save file or tried to back up your own, you might run into compatibility issues. Here are the most common reasons a file is labeled as "not an image":
If you need to create a new PS2 memory card image, there are tools available online that can help you do so. These tools allow you to create a new memory card image file that can be used on your PS2 or emulator.
Sony’s official cards used high-quality Flash memory and controllers that managed "wear leveling"—spreading out data writes to prevent specific memory sectors from burning out. Cheap knock-offs often lacked this sophistication. They were prone to fragmentation, and if you saved a game over a bad sector, that save file was toast.
