USB-sticks die niet willen booten, bootable maken

If you are getting an error "Unable to copy files…" to the USB drive, here's a quick fix:

First run “diskpart” from a command prompt with admin rights. Then...

list disk
select disk # (the number of your USB - make sure this is it!)
clean (this will clear the Master Boot Record)
create partition primary
select partition 1
active
format quick fs=fat32
assign
exit