1/ No the same removable device doesn't always receive the same /dev/sdX.If you 
unmount  it ( umount /dev/sdX) and plug it again, it can be called /dev/sdY (I 
suppose the kernel keeps tne name in memory for some time). 
2/ use "mount" without arguments., plug your flash drive and run "mount" again: 
the new /dev/sdX  (or /dev/sdXn) is your drive (or mounted partition). Unmount 
it with "umount /dev/sdX(n)" and run dd with  "dd if=input-image of=/dev/sdX 
[options]" without the partition number if there was one. All this as root of 
        Good luck. Jacques

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