Diskpart in Windows XP does not show usb drive

In "diskpart" on Windows XP, when you do a "list disk" command it won't show your USB drives. However: It will in Windows Vista or Windows 7. Fun fact: I tried copying diskpart.exe from a Windows7 installation into a Windows XP installation and running it, and got the error message that the file wasn't a valid Win32 application. So don't bother trying that :-)