hi ppl well i just discovered like many others that my powerbook g4 rev d will not power up a external usb 2.5 harddrive enclosure via a single usb port !! This is a known problem according to macintouch because the pb can only supply 5v max via usb where as an ibook can supply more and usb hardrdives function fine with it !!! I know because this enclosure worked fine on that machine (ibook g4) !! anyway my question is can the macbook pro power usb hard drives via a single usb port leaveing the other usb port spare for data or does it suffer from the same issue as the powerbook ??? I have called apple and they claim that they dont know of this problem which is b.s as its all over the net (google powerbook usb issues) can someone with a macbook pro test to see whether it can power up a usb harddrive through one usb port ??? I cant even use a splitter cable because then i have no more usb ports to use for data as both ports are occupied trying to power the thing up !!! i used to use my ibook on my travels (student) but thats sold now so if the mbp doesnt have this problem then i will demand my pb get replaced for a mbp as these machines (pb) are supposed to be portable not disabled and what the fk the ibook can perform this function while a high end pro machine cant ??? come on apple !!!!