The real name is IEEE 1394Apple did not follow the general observation of "if it works not touch it". To that end, he introduced 6 types of FireWire cables that have caused such chaos that even fans of the product have decided that USB is too light and efficient even with limited functionality.
If you are one of those who are still using this method of communication and are having trouble finding cables, pay attention because we'll call the six versions available.
FireWire or IEEE 1394 types, why are there so many?
Apple has tried to do business with its display and cables, providing each model with a unique and precise product type, as opposed to USB. The idea, of course, was for its loyal followers to enter the ring and thereby create a standard for auxiliary industries such as photography, video and audio editing, or for example cinematography.
The truth is putting Cupertino people in their place, and now we'll understand why:
FireWire cable 6 to 6
It was a familiar line of PCs and nearby hubs, which may have gained worldwide recognition for its six variants, which even some cases of PC cases introduced as standard. It was therefore the most widely used
FireWire cable 4 to 6
Variations are also widely used, especially for high speed data transfer cameras, but version 4 did not appear on almost any PC, so a 6-pin type was needed to establish the connection.
FireWire cable 4 to 4
It wasn't a surprise in itself, but it was really hard to see the two devices that had this version of the connector. For some of the camera models and Apple's removable HDD it should be sold, but in reality it was a remnant.
FireWire cable 9 to 4
We are probably talking about the most rare kind of thing. Transmission rates are maintained along with their power depending on the devices, but the 9-pin interface was reserved for professionals with high-end storage and it made sense to use a 4-pin with it.
FireWire Cable 9 to 6
In the field of technology it was the most widely used, or the cameras with the highest resolution, so in that country it was the most viewed by professionals of all kinds.
FireWire Cable 9 to 9
It was dedicated solely to high bandwidth connectivity to ensure maximum speed and consistent transmission, as well as consuming 25 watts that allowed it without any problem.
Outside of the tech world they never saw each other very much and when the industry stopped supporting FireWire they were the first to be eliminated.