Mac mini features an all-new, 1.4-inch-thin aluminum enclosure. It’s called the unibody — a seamless enclosure carved from a single, solid block of aluminum. The unibody construction was originally developed for Apple’s MacBook Pro. It’s created using computer numerical control, or CNC, machines — the same kind used by the aerospace industry to build mission-critical spacecraft components…Now you can get a 320GB or 500GB hard drive¹ and pack in your photo libraries, movies, music, files, and more, more, more. You can also play and burn all the DVDs and CDs you want with the fast, slot-loading SuperDrive…Thanks to a removable bottom panel, now it’s easy to open Mac mini and add memory. Just a slight twist of the panel, and you’re inside Mac mini. Simply pop your memory into the SO-DIMM slot, then twist the panel back on. And you’re done…more info click here