According to iPhone Fan website reports, through public technical documentation of Apple in March 15 "Apple Computers: Powering a peripheral through USB" speculated that at least three years ago, Apple began to bulit new USB-powered standard for Mac products, the new standard improved for 12V/12mmA from 5V/500mA, this standard almost equals to the power capacity as FireWire.
Since this new USB-powered standard was attached in all products from late 2007, why release this news now? It is very clear this is a preparation for iPad. The power capacity of iPad is surely far larger than iPhone, if attach your iPad on USB 2.0 to charge, it would take quite a long time, but with is new power standard, charging iPad will be as easy as iPhone.
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