Yes. Coating wears off under the pads but prevents rust in the normal areas.
Coated discs are a bad idea IMO, how can they get the coating to be a uniform thickness after the discs have been machined? Then again how many people check new disc for run out, and how many smear the hub surface with copper grease.
@lynx started
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Yes. Coating wears off under the pads but prevents rust in the normal areas.