How many amperes can be powered by the USB Port

I'm looking for a new USB Powered HD (in the 160-250 GB range) that my AirPort Extreme's USB port can power.
My current LaCie USB Powered Mobile Harddisk ( http://www.lacie.com/uk/products/product.htm?pid=10651 ) can't get enough power from the AirPort Extreme (n) to run.
QUESTIONS:
How many amperes does the AirPort USB port "support"?
Do you have a USB powered HD that works fine with the APEBS (2.5" in the 160-250 GB Range)? - Make and model please?
Thanks in advance.

Hi Allan,
You mention you wish to use the older SKU p/n SRW224G4P, which has been refreshed and replaced by SRW224G4P-K9-NA
.Here is the EOL notice fior the SKU you detailed;
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9967/end_of_life_notice_c51-626527.html
Why not avail yourself of the newer 300 series switch such as SRW224G4P-K9-NA .
I am using beta code version 1.1 code on my unit.
Version 1.1 will be Generally Available at the end of this month ( fingers crossed), and Version 1.1 firmware supports CDP.
See datasheet for the new product, generations ahead of the old p/n that you mentioned.;
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps10898/data_sheet_c78-610061.html
Anyway the AP1240AG isn't a pre-standard device but supports standards based 802.3af, hence i really see no benefit in using the older product..
Datasheet on the AP1240AG correlates with your data, maximum power drawn is 12.4watts.
Allan, your calulations seem spot on.
SRW224G4P-K9-NA as well as the older switch you mention both support aPOE power budget of 180W.
I personally like to be slightly conservative in terms of loading the switch up.. I prefer to spread the load between switches if i can.
But the GUI of the 300 series switch will show the power drawn by the devices.
The device circled below is a AP1142 with wireless-a turned off.
Have fun,
regards Dave

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