Any idea how to find a thumb drive?

You could try putting a file of certain name on the drive and search for that in the root of every drive. Else, you could just find the last valid drive letter, and you have some chance that it is the usb device. Or else you could just find the drive with the smallest capacity (excuding floppies), but that may fail to work later if usb devices get cheaper.

In reply to Re^3: USB Drive Letter Assignment in Win32 by ambrus
in thread USB Drive Letter Assignment in Win32 by traveler

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