If an intermittent scrape, could be a bent disk.
Check by putting on main stand and spinning the wheel to isolate which disk then replace.
If a constant scrape check the calipers for contamination ( a stone jammed in it ) , seized pistons. bent bolts.
May be the pistons in the caliper are pushed to one side. It should sort it's self with normal use. But to chack set the bike on main stand and with the front wheel in the air spin the wheel to see if the disc is warped or thw bearings are gone in the wheel hub.
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