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USB and FireWire Standards for the A+ Certification Exams

Part of the A+ Certification All-In-One For Dummies Cheat Sheet

The most popular ports used today on the system are the USB and FireWire ports — which allow you to connect devices such as flash drives, digital cameras, and digital video cameras. This table compares features of USB and FireWire, including the transfer rate and number of devices supported.

Standard Transfer Rate Device Support
USB 1.0 12 Mbps 127 devices
USB 2.0 480 Mbps 127 devices
USB 3.0 5 Gbps 127 devices
IEEE 1394 400 Mbps; also known as FireWire 63 devices
IEEE 1394b 800 Mbps; also known as FireWire 800 63 devices
FireWire S1600 1.6 Gbps 63 devices
FireWire S3200 3.2 Gbps 63 devices
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