I called the service department at the local Suzuki dealer just to ask them about it before I work on it. He said because of the semi metallic pads, some grooves are normal depending on the depth and it shouldn't affect anything. He also said he'd check it out so I'm gonna take it in today.
btw I checked it again today and there are grooves on both sides of the rotor.
I'd say they're not too deep, but there's a shit load of them.
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