Grooves in discs (rotors)

[Alan Cherry]

OK Gents and Ladies,
A quick question. When looking at a front disc from the outside, should the grooves go from the centre out, or the outer edge in when the disc is rotated in a forward direction.
Reason for asking - i picked up a new set of discs from Hi-spec Brakes ( Monster Brakes ) this afternoon, as my existing ones have developed a nasty crack since the last race. I'm sure poster on sales office wall showed grooves going in to out,but on checking those already on the car, they go out to in ! - have to get car ready for Lydden on sunday- any directions much appreciated.

p.s. I've been told that drilling discs is mainly for boy racers, and can cause the disc to crack- old discs were drilled , so I've specifically got vented grooved discs that have not been drilled - good move ? or not

Many Thanks
Alan