Today I received my front blank Brembo rotors and when I was inspecting them I noticed that one of them had a cutout on the outer rim:

it looks like some metal was machined away from the core of the rotor, I took some snapshots and put them on my homepage, please take a look and tell me if you've seen anything like this and if this is normal or a defect (the only reason I could think of for this being normal is taking some weight off to ballance the rotor, but I've never seen anything like this before which has me worried)

Thanks.

 

That was done to balance the rotor after it have been crossdrilled/slotted. Most aftermarket rotor companies will do that to balance the rotor......

 

but this rotor is not x-drilled/slotted, it is a brembo stock/blank, it makes sense that it would sometimes need to be ballanced this way, it's just that I have never seen this on any of the rotors I had.