![]() Which is why you can charge a phone from a computer's USB port but not some other USB ports. Portable USB drives tend to flirt with that upper spec (just looking at one drive in particular it's rated at 0.85A) but on most PCs that's ok because they allow a higher draw from each port. Same on both just with a slightly tighter tolerance on the voltage for USB3. It's still 0.9A 5V for the general spec with a higher 5A spec for charging devices. ![]() USB 3 doesn't have a higher power requirement in its spec. HDD is USB 3.0(powered), that's the reason why it won't run on Wii U w/o a y-cable. PC/Mac can usually run a USB 3.0 drive, via USB 2.0, because they have drivers to recognize that the drive is USB 2.0 backwards compatible. The Wii U doesn't read USB 3.0 drives, without the required power of the USB 3.0 spec.
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