Look at the following chart and you may get a rough concept about USB 1, USB 2, USB 3, and USB4. ![]() Then, these companies continued to released USB 0.8, USB 0.9, USB 0.99, and USB 1.0 RC in the following two years.īut these interfaces had little response in the market, and basically no products adopted them. ![]() The first USB protocol is USB 0.7, which was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994. What Are the Differences Between SD Card VS USB Flash Drive? USB Protocols and Speeds Users just need to plug a USB device into a port on a running computer, and then the USB driver will be installed and configured automatically to access the USB device.
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