USB flash drives not being recognised

[DaveJ2717uk]

All teaching staff are allowed to use USB flash drives, kids not. Since last week all usb flash drives are not being recognised, I am using usbdlm to map usb drives to an unused drive letter. When you insert the unrecognised drive you get a quick double beep in windows and drive will not appear. Weirdly if you put a usb that has not been in that machine before it will be recognised and the one that wasn't will then work fine Seems to be update related, but I can't see how, I say this because I've reimaged(XP and SP3)a machine and usb works fine, after updating windows and restarting the same thing happens

[AM_LHS]

We are having the same problem as you have described.
Have you managed to find a soloution for this.
---
AM

[timzim]

Some U3 drives (e.g. Sandisk Cruzer) need to map to 2 drive letters - one (read-only) to the system files and another to the data. Could this be the cause of your problem?

[DaveJ2717uk]

Found the issue to be registry related - HKLM/system/currentcontrolset/system/usbstor - if start is set to 4 USB wont work needs to be 3. The only way around it I found was to push out a reg file in my start up scripts that changed that setting - so far so good, seems to be working Added this line to my start up script %systemroot%\regedit.exe /s %logonserver%\netlogon\usb.reg and exported a reg file (usb.reg) with the correct setting in it.

[m25man]

Also check HKLM\System\MountedDevices

You will probably see a whole bunch like these,
\??\Volume{1409910d-2af5-11de-a718-000000000000}
\??\Volume{6f88d7e0-6079-11dd-9e89-000000000000}

And These
\DosDevices\C:
\DosDevices\D:
\DosDevices\E:

Delete these keys and reboot the system, does this fix it?

Everytime a USB stick get inserted it records the details here, if one of these gets broken it seems to stop the enumeration process.