I have a USB key that was previously set up as a bootable key (clonezilla)
Because of this there is an MBR on the key that will try (and fail) to boot off the key if it is left in a system. Deleting/formatting partitions won't change this.
On Linux I could use dd to overwrite the first few MB of the key and then repartition it, what is the equivalent way to do this on Windows? (destroying all data on the key is fine)