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It's most likely from the car being driven on dirt roads in the past, driven near beaches, on sand, or even contamination on city roads and highways. Basically what has happened is some sort of contaminant is caught in between the pad and rotor, or a pebble had wedged itself into the bottom of where the pad meets the rotor and when the car drives forward, it marked the rotor.
What you can do is take the pads off, clean the rotor and brake pad surface with brake cleaner, relube and reinstall, and hopefully in a few thousand KM the wear evens out. Otherwise your only other option is buying new pads and rotors.
However, this is only cosmetic and your braking should not be affected.
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