| Without seeing the rotor, it's hard to tell what was done. But given the information that you have given, I would venture to say that you might have warped the rotor to some degree.
My best remedy for you is to pull the brake rotor off, take it to a machine shop and have them "true" it. ( Inspect the surface of the rotor ) If it's not warped or damaged too bad, they might be able to turn that rotor ( shave a bit of metal from the surface ) and bring it back into specs.
Another thing to check, see if the caliper was damaged. By taking off with a disc lock on it, you could have struck the caliper and bent it. If it's not square with the rotor, then there is a good chance that it's bent and that would cause a noise.
Hope this helps you a bit.
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