Funny thing is that whilst visiting Australia early last year for some reason customs took real big offence to me and completely strip searched my bags (fortunately, bar my shoes I escaped the same indignity). Anyway, after seeing my PS3 and having a polite discussion about gaming he asked if I knew that I could install my own HDD. I said yes, but at that time had yet to do so. He proceeded to show me how, by taking off the HDD cover and shining his torch inside.
I don't think PS3 had even been released in Australia then, so he was either an avid gamer, or more likely they get detailed instructions on how to search electronics (including consoles). I think they X-rayed everything too.
As it was my first trip to Australia, being held up at the airport for so long (nearly an hour) after a 10+ hour flight really put a downer on my stay. The customs guy was fairly polite though, just doing his job I guess.
Anyway, my advice; don't smuggle drugs in the PS3 HDD bay, it's the first place they'll look.