The Universal Serial Bus (USB) connects billions of keyboards, mice, joysticks, printers, external hard drives and other peripherals to roughly 1.5bn personal computers, and more than 3bn mobile phones use the smaller Micro USB and newer USB-C versions. How do I transfer them to Windows 10 for future safekeeping? Jaki My external USB hard drive, with 11,000 photos from Windows 7, isn’t recognised by Windows 10.