My External Hard Drive is a Sony HD-E1. It uses a USB 3.0 cable. I have been using it for nearly a year now on my laptop and TV with no issues and both only have USB 2.0 Ports. Recently it has stopped working on both devices. My laptop says all my USB drivers are up to date. I tried the Hard Drive with 2 other laptops that have both 2.0 and 3.0 usb ports. The Hard Drive was recognised and working without any problems in the 3.0 ports but did not on the 2.0 ports. Can anyone help me with this issue or an expaination as to why this would happen.