I bought the hard drive because of the anti-shock technology. The first plate was immediately recognized. The first letter came error messages that the disk can not be accessed. After several attempts at different computers and prompts from Windows to repair the disk, the disk was not detected (or even in the system management of Win 7 Win 8.1). The return and replacement was a breeze. The second plate was 3 computer not recognized under USB 3, but probably due to the USB 2 port. But I have not bought. So return.