Transcend's external 2.5-inch (6.35 cm) hard disk offers safety according to military standard. It has been successfully according to rigorous drop test standards of U.S. military. It is one of the safest places where you can store your data. The Transcend's external protects your data three times: The solid casing of the hard disk is surrounded by a shock-absorbing outer cover made from silicone. The inside of the housing, there is an internal spring system that vibrations optimally balances. The robust silicone sheath also protects against dust, dirt and water. The three-stage anti-shock technology reduces significantly the risk of a hard drive failure with a fall of your hard disk when switched off.