A truly mobile device needs to be light, thin and strong enough to take with you wherevere you go. It also needs to perform quickly, spring to life instantly and have enough battery power to keep up with you. It should have no spinning hard drive, no optical drive and no unnecessary parts... the exact description of the new MacBook Air. When MacBook Air first debuted, it was groundbreaking in many ways. Chief among them was the precision unibody enclosure. Now that same engineering process comes to the MacBook Air's display. Just like the main enclosure, the display housing is crafted from a single piece of aluminum, with all the structural elements machined directly into it. Total unibody construction means a less complex design with fewer parts. That makes MacBook Air exceptionally thin and light, yet still durable enough to handle the rigors of everyday use. MacBook Air is designed completely around flash storage, but in a totally different way. Typically, flash storage is housed in a package that’s the same size as a conventional hard drive. Yet the flash chips themselves occupy a very small portion of that housing. Getting rid of the hard drive enclosure and using only the parts that matter the actual flash chips frees up about 90 percent more space. And just like that, there’s room for other important things, like a bigger battery. Now you have a notebook that weighs practically nothing and runs for hours on a single charge. That’s mobility mastered.