Couldn&#x27;t you just use an actual device medium?<p>The fact that a burnable CD should have no parts that can think actually makes using one for input and one for output probably safer (though you would then need the trusted application to include a CD&#x2F;DVD burning capability).<p>As an alternative, a &#x27;raw&#x27; interface, such as an actual programmable flash device or maybe an SD card could work.