So all I can do is ask if there is a detail available like that.
How long a cable is needed?
Purchased a Usb powered extension some time ago. Did not try it immediately as I didn't need it. Finally decided to try it and I get an error message stating "USB device Not Recognized" "One of the USB devices attached to this computer has malfunctioned". I have tried the cable on two laptops and two desktops; operating systems ranging from the current Windows 7; Vista and Windows XP. All with the same results.
Going into device manager on the Xp system; it tells my that there is an "Unknown Device" and that there are no drivers installed for it. Did extensive research on the web; and every where it says that no drivers are required for a powered USB cable.
Any suggestions or alternatives. Have had the cable to long to return it; so that is out!