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Yes, I'm sure, because I've tested it before flashing and my 2.5'' drive spinned up properly,
except that with the original Linksys firmware, only 3g USB sticks were supported, no storage devices,
this was the main reason I decided to switch from the stock firmware. -
No, I am not certain that the WRT54G3GV2-VF’s USB ports can be powered up via GPIO,
I just tried it according to the relevant wiki page, it was the only hint I came across after a lot of Googling.