Rust on Brake Rotors - Normal?

washed the car 3 weeks ago and haven't touch it since last tuesday, first it would not start as the battery was knackered, after a quick charge it started but the brakes were hard solid from the rust so had to accelerate a bit and there was big clung noises and everything was back to normal, do not leave you hand brake on if possible specially after cleaning your car, put it in gear and you will not have any stuck brake problems
the rusted discs are part of Porsches life, it is apparently due to the metal used, nothing to worry about.

Cheers!