Hello. I'm an absolute Mac newbie, but my brother just ordered a new iMac and a bunch of accesories. Well, I had told him to get the Airport Express + an external Drive vs. the Time Machine becuase that way, he can bring his drive to me whenever he needs to back that drive out. Then this morning it occurs to me, will a drive for Mac can even be read in a Windows machine? Should he get a time machine instead? (assuming he can still change his order). And is the Airport express just a time machine without the drive?