I do get asked quite often what the hard drive looks like on the inside and sometimes people even want to look inside it!!
This video shows you basically what is inside your hard drive (an old hard drive) so you never feel the need to destroy your own by opening it up.
It is not recommended you ever try this as even the slightest amount of dust on the spinning platter could permanently damage your drive and data. Drives should only be opened by professionals under dust free conditions.