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This is more of a hardware question, but i wanted to know: what's the maximum feasible size that a touchpad can be made? I am wondering because someone remarked to me the other day that the surface on an iPod Touch is basically a touchpad, so how big can they be?

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Well, technically, there CAN be a limit - Being as big as to consume too much electric energy that the computer's power supply can't handle. This would-be size is too big to be functional and practical for a human user, however.

So, practically - You can have it as big as you need.

Take a look at: Wikipedia's entry about touchpads.

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Isn't Microsoft Surface a huge touchpad, too?

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Nope, it uses IR cameras to see where your fingers are you the surface. – RCIX Nov 12 '09 at 10:53
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My FingerWorks keyboard has no keys -- instead, the entire surface of the keyboard is a giant touch surface. (More info here.)

alt text

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Looks very cool. Too bad Apple shut them down. – Thilo Nov 13 '09 at 0:33
Yep, too bad and no reason for it either. They could have kept selling the wares to us uber-geeks while using the tech in the iPhones and mAcbooks, but the old business had to die. Pity. – Torben Gundtofte-Bruun Nov 13 '09 at 7:28
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