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  1. #1
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    USB Conflict (XP SP2)

    I have had this problem for about a year. I'm an OK IT person, and our (good) IT department is stumped. We just did a clean reinstall of XP, and the problem did not go away.

    This could be a power problem, but I'd like to check out all other options too.

    My external storage devices don't play nice together. This only happens on one PC (a 2 year old Dell Dimension with USB 2.0). I have a similar system that is about 6 months older, and they work fine there. Here's what happens on the faulty machine:

    1) My external hard drive plugs in, finds its (unique) drive letter, and works fine.
    2) My thumbdrive plugs in, finds its (unique) drive letter, and works fine.
    3) When I plug them both in at the same time, the external hard drive works, but I get the "USB device not recognized" error from XP about the thumbdrive. Clicking through just tells me that I have an unknown device.
    4) But ... I don't have to reboot to get the thumbdrive to work, I just have to unplug the external HD.

    A power issue doesn't seem reasonable to me: I usually only have a printer and a wireless keyboard receiver plugged in at any time.

    Hard or soft rebooting makes no difference.

    The reinstall made no difference.

    I have also tried an overnight power disconnect, and it made no difference.

    Suggestions?

  2. #2
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    Re: USB Conflict (XP SP2)

    Just some additional notes on my problem.

    1) My external HD has its own power cord.
    2) Oops - my printer is not USB.
    3) I am going through the power consumption on my system right now, and here is what I see (with only the external HD, and wireless keyboard receiver plugged in).

    Generic USB Hub, self-powered, 4 ports available, 500 mA per port, power required 0 mA

    USB Root Hub, self-powered, 1 port available (1 taken up), 500 mA per port, power required is 98 mA and 0 mA

    USB Root Hub, self-powered, 2 ports available, 500 mA per port, power required 0 mA

    USB Root Hub, self-powered, 2 ports available, 500 mA per port, power required 0 mA

    USB Root Hub, self-powered, 2 ports available, 500 mA per port, power required 0 mA

    USB Root Hub, self-powered, 6 ports available, 500 mA per port. that last one lists 2 attached devices: the Generic USB Hub (requiring 0 mA), USB Mass Storage Device (requiring 100 mA).

  3. #3
    Uranium Lounger viking33's Avatar
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    Re: USB Conflict (XP SP2)

    Have you tried to use a different combination of USB ports for the two devices?
    BOB
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  4. #4
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    Re: USB Conflict (XP SP2)

    I've run into a similar problem on a Dell machine. What I did to resolve it was to plug the USB thumbdrive in by itself so that Windows recognized it and then changed the drive letter in "Disk Management". After that, it worked fine. <IMG SRC=http://www.the-highway.com/Smileys/Ponder.gif>
    Jeff
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    Re: USB Conflict (XP SP2)

    Yes.

    But ... I do seem to be getting the devices coming up in the same hub even if I connect them to different physical ports. I'm supposed to have 5 hubs, but no matter where I plug in either drive, I get power going to a storage device in the first and last hub on my list.

    Is it possible that the physical ports are not going to different hubs like they are supposed to?

  6. #6
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    Re: USB Conflict (XP SP2)

    Sorry Pilgrim - been there done that.

    Part of the reason I did a reinstall of XP is a suspicion that if I didn't do this correctly the first time that it would be goofy forever.

    So ... they were all up and working with their own dedicated drive letter before I checked for a conflict.

  7. #7
    Uranium Lounger viking33's Avatar
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    Re: USB Conflict (XP SP2)

    Might be worth a call to Dell support.
    Have you tried Pilgrim's suggestion yet?
    BOB
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  8. #8
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    Re: USB Conflict (XP SP2)

    I'm here because I've been through tech support: Dell blames Maxtor, and vice versa.

  9. #9
    Uranium Lounger viking33's Avatar
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    Re: USB Conflict (XP SP2)

    Oh, OK,
    I didn't see that you had already been through the finger pointing routine.
    I don't use Dell hardware but maybe some of the other Loungers who do, will pop in here and offer few thoughts.
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  10. #10
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    Re: USB Conflict (XP SP2)

    Having just had to fight my way through a reinstall on an Optiplex 320, and ending up with no drivers for the on-board ethernet NIC, the on-board video, and two entities called SM Bus and PCI Device, I would ask
    1. <LI>have you checked everything in Device Manager for any dreaded yellow question marks?<LI>is there anything in the System Event Log that would give any clues?
    <font face="Script MT Bold"><font color=blue><big><big>John</big></big></font color=blue></font face=script>

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  11. #11
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    Re: USB Conflict (XP SP2)

    A) Nope, no dreaded yellow flags.
    [img]/forums/images/smilies/cool.gif[/img] Oddly, the "USB Device Not Recognized" error I'm getting doesn't seem to generate any message at all in the System Event Log.

  12. #12
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    Re: USB Conflict (XP SP2)

    This question has been re-posted in the Hardware forum. To prevent duplication and confusion, I am locking this thread. Please post all replies in the other thread, starting at <post:=663,883>post 663,883</post:>.

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