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Windows 7: USB's Drive Not assigned

26 Aug 2011   #1
goodwins

Windows 7 PRO 32 Bit
 
 
USB's Drive Not assigned

Hi I am running Windows 7 32 bit Professional. When I plug a USB in the message that the device has installed appears. When I go to Printers and Devices the USB appears. When I go to Device Manager the Device appears as a uninstalled device and in Disk Management it has not been assigned a drive letter. Any thoughts?


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26 Aug 2011   #2
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Assuming the USB you refer to is a flash drive, have you formatted it? In Disk Management Right click it and choose Assign drive leter, any one will do.
My System SpecsSystem Spec
28 Aug 2011   #3
goodwins

Windows 7 PRO 32 Bit
 
 

Hi Britton 30, Yes the USB is formatted. It works on XP machines fine and also one of my Win 7 machines but not the others. I have 30 machines in one lab and the ones that fail give me the following message when I try to assign a Drive. "The operation failed because the disk management tool is not up to date. REfresh the view, Close the disk management or restart the PC" After attempting all these things I still get the same message. Any other suggestions would be greatly appreciated.
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28 Aug 2011   #4
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Very odd. Maybe some file corruption, try running SFC /SCANNOW Command - System File Checker. Then, or, try a manual Windows update after doing this: Windows Update - Reset, using Option Two.
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28 Aug 2011   #5
goodwins

Windows 7 PRO 32 Bit
 
 

Silly me... I just did a driver scan for the unrecognised device in Device Manager and it found a generic volume for the drive and thus assigned a drive letter. However I can not have my users do these steps everytime they plug a USB into the machine. Can the generic driver be placed in a location that all users have access to and would be found automatically on connection of a USB.

By the way the scan file produced no integrity violations!
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28 Aug 2011   #6
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

I'm not fluent in networks, but I think it could be placed on one of the PCs and deployed to the rest?
But Windows should install a generic driver on its own. Have you tried different USB drives? Maybe you have a wonky (tech term ) one.
My System SpecsSystem Spec
28 Aug 2011   #7
goodwins

Windows 7 PRO 32 Bit
 
 

Pluged USB 1 in Appears in Device Manager as unknown device
Update Driver - it installs the generic volume
Still appears in Device Manager as an unknown device (although it can now be accessed)
Update Driver Again - it installs the WPD File System Volume Driver
Now appears as a recognised Driver in Device Manager

Plugged in USB 2 - Had to perform same steps
Plugged in USB 3 - Same scenario - 3 out of 3 not working dont think it is therefore a USB error but rather a setup or system error.

All installs of Drivers were from scans of the c: so surelly a scan for these drivers should perform automatically when a usb is plugged in? Confused !
My System SpecsSystem Spec
28 Aug 2011   #8
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Me too buddy, I'll ask for some one more knowledgable for help. Check back regularly, it may not be right away.
My System SpecsSystem Spec
29 Aug 2011   #9
pooch

Windows 7 Ultimate x64
 
 

You could try this fix; USB Driver - General Fix for Problems[2]=Hardware%20and%20Drivers
My System SpecsSystem Spec
29 Aug 2011   #10
goodwins

Windows 7 PRO 32 Bit
 
 

Hi Pooch thank you for your suggestion. I followed as outlined in your post deleting all unknown devices and the cache file. Plugged in a known working USB and recreated the infcache file - USB Worked like a charm. Connected a different USB but same thing happens... appears in Device Manager as unknown device and requires the driver to be updated.
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 USB's Drive Not assigned




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