So has anyone had any luck running a hard drive with this unit without supplemental power? I've tried a few different drives (toshiba 120GB, Western Digital Passport 120GB) but neither would run off the HUs power. Supposedly it puts out 500mA and that's the USB spec but either it doesn't put out that much power or these drives need more. If I add a 5V power supply, they work just fine...which is probably where I'll end up. Anyway, just wondering.