ADATA HD680 external hard drive 1 TB BlackWhen bringing your data on the road, youll want to make sure its well defended from knocks, drops, and prying eyes. Sporting a robust layered construction, shock sensors, and AES 256 bit encryption, the ADATA HD680 has you covered! Military Grade Protection The HD680 meets the U. S. Military MIL STD 810G 516. 6 standard. It achieves this with a triple layer construction that consists of a shock absorbing silicone casing, sturdy buffer, and a cushioned