06-01-2008, 04:14 PM
Well, given that a standard USB port - 1.1 or 2 - only supplies 2.5 W of 5 V power, 0.5 W is significant. Also, are you quoting the run time power draw, spin up power needed is higher. You might have gotten it to work with one of the USB power "Y" cables.
As for the MBP's USB ports, supposedly they may supply a bit more than the USB spec calls for. But I have not been able to find any documentation from Apple on how much yet. I have run across some reports that one USB port is better at providing a higher power level than the other. Apple is better at giving the Firewire power amount available, 7 or 8 W the last time I checked.
As for the MBP's USB ports, supposedly they may supply a bit more than the USB spec calls for. But I have not been able to find any documentation from Apple on how much yet. I have run across some reports that one USB port is better at providing a higher power level than the other. Apple is better at giving the Firewire power amount available, 7 or 8 W the last time I checked.