This is a topic I find most people didn’t really know about is USB devices and connections. To keep it simple, you want to match the device (DVD-ROM, Portable HD, WebCam, Printer, etc) and connection of the same standard version, i.e., USB 2.0 connection on your laptop with a USB 2.0 device. During the switch of USB1.0 to USB2.0 most companies didn’t want you to know about the change, so that they can keep selling USB 1.0 products, and it caused some problems, for some products are not backward compatible. So you don’t want that to happen, although it is said that USB 3.0 is backward compatible.
At the end of the day, what does an average consumer needs to know about USB?
- It is a standard for connection of peripheral equipment to your PC.
- New standard is about new transfer rate, i.e., USB 3.0 (5Gbit/sec) is faster than USB 2.0 (480mbit/sec).
- On your computer, it is daisy-chained, although you will see multiple USB ports, i.e., you are sharing the same port for multiple extended equipment. In other words, the speed of data transfer is reduced by the number of devices attached.
- It’s backward compatible, and the lower denominator is the connection speed. In other words, connecting a USB 2.0 portable DVD ROM to a USB 3.0 will only transfer data at a maximum speed of a USB 2.0 port(480mbit/sec).