Will the PB G4 USB-ports provide sufficient power for external HDD ?

I am in the market for a 2,5in external HDD, preferably powered through the USB-ports of my PB G4. However, I have read that in many cases, Apple's laptops provide insufficient power for such devices. Is this a fact?
The drive I'm currently looking at: Western Digital Passport 120GB USB2.0 (WD Passport WDXML1200UE)

Dear Thosen, yep this can be a problem with the 12' models, I think that there are adaptors, that use both USB ports, one of power and one for data transfer. The other option is to try a firewire drive - this has the added advantage of being bootable.
bw
Andrew Platt

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