Saying no to an Australian Customs Officer is not very wise
Couldn't agree more! I spoke with a lady from Customs a few days ago, asking her about our rights.
While she is not a lawyer - and did not pretend to know all the relevant legislation - she did say that any bags or luggage (or contents) is theirs to do with as they see fit. However, she also mentioned that they do require "cause" to carry out a body check.
So, swallow your hard drive!
I think it's time the AOA volunteered some advice for us weary travellers.