Anonymous Posted on Sep 21, 2009

Targus Travel USB 2.0 4-port Hub

I just buy a Targus Travel USB 2.0 4-port Hub but it don't recognize USB Auto-powered hard disk drive.
Can somebody tellme what happens???

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Anonymous

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Posted on Sep 23, 2011

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Some external USB hard drives, typically 3.5" drives, draw more power than a singlee USB port can provide through one port (the standard is max 5v, 500mA per port). Usually the drive will ship with a USB cable with 2 USB male connectors on one end, with one colored red. This is for you to plug into a second USB port to draw up to an additional 500mA power through the cable to help spin up your external hard drive.

Most USB hubs I have seen draw a maximum of 2A or less and the allow this to be drawn upon by the ports at up to 500mA per port. But a 7-port hub will not be able to provide full power to more than 4 ports, which is normally OK because few devices pull the full 500mA. Sometimes just reducing the number of items on that USB hub to 3 or 4 will solve your issue. And you cal also use a hub with its own power source to help meet the current demand for all 7 ports.

Clive Gray

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Posted on Sep 21, 2009

Clive Gray

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Sometimes usb hard drives will not work through a usb hub.
if the drive works connected to the laptop but not the hub then that's how you'll have to use it.
it's also possible the laptop cannot power both the hub AND the drive, in whaich case you'll need a powered hub (one you plug in to the mains).

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