I can't imagine 17" notebooks to be less than 3lbs. The battery itself is a lot of the weight. You have to remember all of the components that go into a notebook. To make a 17" notebook to be less than 3lbs will require some extraordinary engineering and a LOT of money. It will also result in it being less powerful... like the Macbook Air, which is 3lbs.
What do you estimate the cost would be to produce a 17" <3lbs notebook? How much money would it be to the consumer? It would make Apple look like they only produce notebooks for the rich elite.
No. Nano engineering is not about compromises. It is about defeating compromise. The MBA is an epic fail because it is not a product of nano engineering. Thus it is compromised as you note.
I would think that given the outer dimensions to work with a three pound 17" laptop should be easier to manufacture than the Sony Z, which does not have much in the way of new materials.
The problem with laptop weight is that the Intel processor is about the only thing being nano engineered. The manufacture of "new" laptops is basically done with off the shelf generic parts. Until those generic parts are nano engineered down in size and weight it would seem that laptops will be frozen in time.
Within two years the CIA will be able to fly nano engineered predator drones into your house through holes in your window screen. The nano engineered drone will be able to record video and sound and transmit it to "The Company". They could also equip the little drone with poison and send a swarm of them to kill unnoticed.
This is what America produces. Death, pain and misery.
For more information about the nano Predator drones read "The Singularity is Near" by Ray Kurzweil.
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