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Thread: USB Conflict

  1. #1
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    USB Conflict

    Edited by HansV to provide clickable link to post - see <!help=19>Help 19<!/help>

    I am cross-posting in this forum to see if there is a different pool of knowledge than in the XP forum. The thread over there starts with <post:=663,236>post 663,236</post:>.

    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?

    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).

  2. #2
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    Re: USB Conflict

    Are you saying that the same two devices work fine on the other system? Does the attach order make any difference? If you are using USB ports on the front of the PC have you tried on the back (or vice versa)?

    Joe
    Joe

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    Re: USB Conflict

    Sorry - I couldn't connect for a few days.

    Yes, I am saying something very much like that. Everything works properly no matter where they are plugged in, and they all have unique drive letters. But ... the external HD kills the thumbdrive(s) if they are plugged in.

    I have made some advances on this since the other day. Bottom line - I can now get the thumbdrive to be recognized as a drive by XP in My Computer (when the external HD is plugged in), but, it if you open it up to show the contents XP shows it as empty (when it isn't).

    I made this advance by turning off the power management switch in Device Manager. Before, when the thumbdrive failed, XP cut off its power, and it wouldn't even show up in my device list. With that switch unchecked, XP maintains the power, the thumbdrive lights up, it shows up in Device Manager with no yellow flags, and it is detected by XP, but XP can't properly read the contents.

    To me, this eliminates power use as an issue.

    So ... I'm down to why can't XP read the contents of an otherwise viable thumbdrive, just because another device is plugged in at the same time?

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    Re: USB Conflict

    Is the BIOS up-to-date?

    Joe
    Joe

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    Re: USB Conflict

    I doubt it, but I'll check into it.

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    Re: USB Conflict

    No, it wasn't upgraded. It is now.

    No change in my problem though ...

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    Re: USB Conflict

    Is the OS up-to-date with patches? You are running sp-2 right?

    Joe
    Joe

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    Re: USB Conflict

    Yes, everything is up to date.

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    Re: USB Conflict

    Does it make any difference if you plug the thumbdrive into a different HUB?

    Joe
    Joe

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    Re: USB Conflict

    No, this is why it is so confusing.

    There's got to be a red flag somewhere to show me what to fix!

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    Re: USB Conflict

    Unless you have a power supply problem, I'm out of guesses. I hope someone else has an idea for you. Sorry.

    Joe
    Joe

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    Re: USB Conflict

    Thanks.

    I'm out of guesses too. That's why I'm here.

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    Re: USB Conflict

    Just by chance have you tried two thumb drives or two hard drives?

    Joe
    Joe

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    Re: USB Conflict

    1 external USB hard drive (and an internal one, of course)

    1-2 USB thumbdrives

    The problem only shows up when the external hard drive is plugged in, and it then interferes with either or both thumbdrives.

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    Re: USB Conflict

    Can you try a different USB cable for the HD? Do you have a second USB HD to try?

    Joe
    Joe

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