USB stands for Universal Serial Bus. It was developed in 1995 to make adding peripherals to computers hassle free, as easy as hooking up a telephone to a wall-jack. Users don't even need to shut down and restart PCs to attach or remove the USB device. Just plug-and-play! Windows 2000 or XP OS systems provides full hot-swappable support to USB devices. Hot-swappable meaning, you can plug the USB in, or remove it with the computer already on. For earlier Windows version such as 95/98/Me/NT drivers are required.)