If you are shopping for FireWire technology, you’ll often see it referenced by two additional names. Sony frequently calls the technology i.Link, while others favor the generic IEEE 1394, which refers to the number given to it by the Institute of Electrical and Electronics Engineers.
The technology is identical, what is at play here is a resistance to use the FireWire logo and name which is closely associate with Apple, Inc. which co-developed the technology. Adding to the confusion is that there is FireWire 400 and FireWire 800. The technology called FireWire 800 uses a 9-pin connection type and is much less common. It is generally used for higher-speed hard drives and is usually not found on cameras.