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Appear then Disappearing USB Hub


I bought a USB Hub with power adapter which has multiple ports.

After connecting it to my pc, plugged my USB external hard disk into the USB Hub, the USB drive letter that is linked to the USB external hard disk, appears as drive F then suddenly disappears. WHY is that?

But, if I unplug the USB Hub, then connect my USB external hard disk to the pc, the drive F appears permanently. Further, from computer management, the USB Hub is present under the USB controllers .

I'm running Windows 7.

Appreciate any help.
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2 Solutions
Darius GhassemCommented:
Some USB devices do not support being plugged into a USB hub
mcse2007Author Commented:
HOW come?
Raymond PengSystems EngineerCommented:
Could be not enough power output from the USB hub even though it's 'self powered'.  You may want to check to see what devices it's able to support.
mcse2007Author Commented:
Though this isn't the answer, you've given me some ideas to try few USB memory sticks which both worked....finally, I connected the external USB hard disk,....VOILA...the bluddy thing showed up.

I don't know WHY I have to do the above sequence of tasks, but it worked...that's all I'm interested....cheers.
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