The disk also contained security policies, facility blueprints and employee social security numbers belonging to the system's designer, aerospace manufacturer Lockheed Martin.

In Australia, a disk belonging to a nursing home was found, containing pictures of patients wounds.

A recent Verizon Business forensic data breach report found that data loss via portable hard drives accounted for one in 150, from a total of 285 million record breaches, and according to Mark Goudie, Verizon Business' managing principal for investigative response in Asia Pacific, these numbers are insignificant.

"There is a lot of hype about the dangers of data leaks by portable media like USBs and laptops," Goudie told .

An investigation is currently underway at Lockheed Martin, and a spokesperson told Britain's that the company was not aware of any compromise of data related to the THAAD system.