Are USB ports normally this selective?

  cocteau48 10:17 07 Mar 09

Having recently dismantled the entire system (room decoration)I did not pay particular attention to which USB cables came out of which of the four USB 2.0 ports on my desktop.
Upon reassembly I started to get an intermittent "USB device not recognized" for my ext DVD writer.
Trying different cables into different ports would achieve a "once only" recognition.
(I connected the DVD writer to my laptop which was instantly recognized in all ports which should rule out a hardware fault.)
Oddly enough if I connected it into the single USB 1.1 port on the front of the desktop it was always recognized but with the obvious proviso that it would not perform to its maximum capability.
Eventually I struck upon the combination of cable and port that the writer was initially installed into and stability appears to have been restored.

Is it normal for USB ports to be this selective and why?

  ambra4 10:52 07 Mar 09
  cocteau48 11:19 07 Mar 09

Thank you ambra4.
Excellent explanation on the posting which you linked to.
You learn a little something new every day!

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