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An investigation is under way into the disappearance of a computer hard drive which could contain the details of about 100,000 Armed Forces personnel.
It is understood the drive was not encrypted.
The missing drive is the latest information security breach to hit the MoD.
In July officials revealed 658 MoD laptops had been stolen over the past four years and 26 portable memory sticks containing classified information had been either stolen or misplaced since January.