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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I can tell you the internal vents go outward and wrap opposite the direction of wheel rotation.
As to direction cross drilled holes go, it depends on how they are drilled. 930 rotors have the hole coincident with the internal vents, after-market rotors are all over the board; as to how they are drilled.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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