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  1. #1
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    Some Flash Drives won't work

    I am an experienced PC user, currently using Win 7 Home Premium 64 bit with all updates installed.

    Over the years I have spent a lot of time helping out friends and family with PC issues. The irony is that now I have an issue myself which I have been unable to resolve and I need help to preserve my sanity which is becoming very ragged.

    It happened suddenly that I discovered that some flash drives were no longer recognised, although USB hard drives and external DVD burners were OK.

    I have several flash drives, all FAT32, ranging from 4 GB to 16 GB. There seems to be no rhyme or reason for the problem and I have tried different USB ports on the laptop, as well as a powered USB hub. All flash drives work normally on my wife’s almost identical laptop.

    Connecting one of the recalcitrant drives produces the usual USB audio connect sound but it doesn’t show in Safely Remove Hardware. The flash drive shows in Device Manager .......

    Screen Capture (1)1.jpg


    However, while it shows in Disk Management, there is no drive letter.

    Screen Capture (2)2.jpg


    Right clicking and trying to set a drive letter gives this .......

    Screen Capture (3)3.jpg

    And trying to format gives this ......

    Screen Capture (4)4.jpg

    I have re-formatted these drives on my wife’s computer but nothing changes.

    I tried updating the drivers but I am told that I have the latest installed. I’ve uninstalled and re-installed these drives, but no change.

    All flash drives are USB2 except for a Corsair Flash Voyager 8 GB that is USB3, which is one that won’t work.

    I would appreciate any help that you can give and perhaps others may also have the same problem and think that the flash drive was faulty. Some of the “faulty” ones are almost brand new.

    Regards

    Colin Robertson
    Brisbane
    Australia

    P.S. I discovered this in a MS forum. Unfortunately it doesn't work.

    Uninstall and reinstall the USB controllers:

    a) Click Start and type “devmgmt.msc” (without quotes) in the search box, and then press Enter.
    b) Expand the Universal Serial Bus Controllers section.
    c) Uninstall each of the devices under the USB Controller section by right-clicking on each one, and then clicking Uninstall.
    d) Close the Device Manager and restart your computer. Windows will automatically re-install the USB controllers in your computer, without you having to do anything further. Your computer should now run USB devices properly.

    --------------------------

  2. #2
    Super Moderator CLiNT's Avatar
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    Try the drives in question on another computer, if they don't work there, chances are they are corrupt.

    You might also want to try a hard power-on;
    Shut down the computer as normal, unplug the power cord or flip the PSU power switch to off,
    then hit the power on button on the front of the computer to discharge the capacitors, wait two min.,
    then restart the system and try your USB flash drives again.
    DRIVE IMAGING
    Invest a little time and energy in a well thought out BACKUP regimen and you will have minimal down time, and headache.

    Build your own system; get everything you want and nothing you don't.
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  3. #3
    Super Moderator bbearren's Avatar
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    Have you run sfc /scannow?
    Create a fresh drive image before making system changes, in case you need to start over!

    "The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware.
    Unleash Windows

  4. #4
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    The flash drives work normally on other computers. I turn my laptop off each night and so do a new cold boot each morning.

    I have run chkdsk twice, and also done full virus scans with AVG and Malwarebytes.

    No, I hadn't run sfc/scannow. I just now typed sfc into Start/Search and got the result sfc.exe. When I click on that I get a flash of a command screen but nothing else.

    How should I run it and what should I see happening?

  5. #5
    Super Moderator bbearren's Avatar
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    Open a Command Prompt by right-click and selecting "Run as administrator", then in the Command window, type

    sfc /scannow

    and let it run to completion. If it finds corrupted files, it might take a while. I would run it three times in succession, rebooting between each run.
    Create a fresh drive image before making system changes, in case you need to start over!

    "The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware.
    Unleash Windows

  6. #6
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    Thanks, I'd forgotten how to do that.

    As you suggested, I ran sfc /scannow three times with reboots in between. On the last occasion I had one of the problem flash drives connected. The 3 results were the same .... "Windows Resource Protection did not find any integrity violations".

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