The data is organized into data frames or packets. The USB physical layer consists of only four wires: two provide 5 V power and ground to the peripheral device the other two, D+ and D–, form a twisted pair that carries differential data with a signaling voltage of 3.3 V. (1.5 Mbps), full speed (12 Mbps), and high speed (480 Mbps). USB operates at three data transfer rates: low speed Interrupt-driven transfers for time critical data such as mouse Memory devices, to isochronous transfers for streaming media, to Transfer modes handle everything from large bulk data transfers for On-the-fly connection of hardware and loading of drivers. Supported by all common commercial operating systems, it enables USB is the serial interface of choice for most computer peripherals.
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