And I've got a 2.5" 9mm internal one, but I'm fairly sure that they're talking about density per platter and all 2.5" HDDs larger than 750 GB seem to use two pl

And I've got a 2.5" 9mm internal one, but I'm fairly sure that they're talking about density per platter and all 2.5" HDDs larger than 750 GB seem to use two platters.