This what I was referring to Sorry my mistake.
DOD has been hit numerous times during this war due to the activities of its users. This is a an example of a user using a storage device for classified and unclassified data, a huge no no.
One solution would be mobile storage that will only work between client computers and won't connect on those without client software. Another would be a drive that logs the MAC addresses it is plugged into, but that would require auditing.