This question already has an answer here:
Since I can remember, my Windows 7 always shows 6 icons for fictitious Removable Disks. They aren't a problem, really - when I insert a real USB stick, it shows as yet another icon (but working).
But they are a mystery, and I've always wondered where they come from, why are there 6 Removable Disk icons for disks that don't really exist. If I try to open any of them, I only get this dialog saying:
Please insert a disk into Removable Disk K:
So where do these icons come from? I most definitely don't have 6 USBs attached to my computer, or anything like that.