Click click clak clak clak clak, tdan tdan tan tan tann
Click click clak clak clak clak, tdan tdan tan tan tann
Click click clak clak clak clak, tdan tdan tan tan tann
If you hear such noise from crankcase side then its engine bearing noise.
If rotor thickness is more than 6mm, dont bother. Dont change and dont get rust removal as after driving for a while it will be fine. Lets say after 100km in traffic i mean, not highway. lol. You need braking to clean the pad and rotor.