I concur. They are probably from different manufacturers. I prefer the non directional pattern. If the final roughness is too great the brakes will take more effort for a period on time (till they wear in).

The phono record type continuous machine turned rotors can cause a number of noises due to the pads trying to screw themselves up the rotor.

If you have no problems I wouldn't worry about it as the surface will be gone in a few thousand miles anyway.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician