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Old 04-29-2007, 08:21 AM   #1 (permalink)
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Default under powered usb port

I've bought a WD passport hard drive and it needs 1000ma power; my usb ports only give out 500ma. Can anyone advise me on how to get it to work? Thank you :happy:
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Old 04-29-2007, 02:21 PM   #2 (permalink)
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Default Re: under powered usb port

Hello,

You need to use a 5V DC adaptor to power it if your USB ports doesn't give enough power.
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Old 04-29-2007, 07:16 PM   #3 (permalink)
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Default Re: under powered usb port

i'm not shure about usb ports but is it a 2.0 and is your power supply have enogh of power for it
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Old 05-01-2007, 01:57 PM   #4 (permalink)
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Default Re: under powered usb port

yes the usb ports are usb 2.0 problem is the hard drive has no power input - the only power it gets is from the usb. it works on some other computers
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Old 06-08-2007, 06:04 PM   #5 (permalink)
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Default Re: under powered usb port

got a higher wattage power supply
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Old 06-08-2007, 07:09 PM   #6 (permalink)
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Default Re: under powered usb port

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Originally Posted by philbar71 View Post
got a higher wattage power supply
no this is nothing to do with the power supply.

All usb ports provide 100mA of power as standard, but can go to a maximum of 500mA.

"The USB specification provides a 5 V (volts) supply on a single wire from which connected USB devices may draw power... Initially, a device is only allowed to draw 100 mA. It may request more current from the upstream device in units of 100 mA up to a maximum of 500 mA."

1) Go to control panel > system > device manager and find the usb root hubs and check there are no options to play with.

2) Also check that you can't connect 2 usb cables to the hard disk.

3) Failing that then check the WD site.
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