Unfortunately I don't think such an adapter exists and if it did exist I would not expect it to be cheap. Apple has dropped FireWire 800 from most of its portable Macs to save space but with Thunderbolt you can simply pick up an adapter and carry on using any FireWire 800 devices you have.I need to connect a FireWire 800 external hard drive to a MacBook Pro early 2013 through its USB 3 port. There’s a huge ecosystem of FireWire 800 devices so support for them is still very much required. USB 3.0 however completely obliterates FireWire 800 and, as such, the latter’s now fast becoming a legacy connection. Compared to someone who is doing a constant 30MPH, they’ll be much slower reaching the finish line. Imagine if someone was driving 50MPH for a few seconds then stopping, then 50MPH and stopping again. FireWire 800 is a constant rate - it constantly sends data at 800Mbit/sec. It sends a lot of data at its highest speed before stalling and then repeating it again. USB’s transfer rate is know as a burst rate. If USB 2.0 was 480Mbits/sec and FireWire 800 was 800Mbits/sec, then surely that would make FireWire 800 just under twice as fast? Actually, FireWire is a lot faster than USB 2.0. LaCie are a popular manufacturer of FireWire 800 storage devices USB 3.0 cables are noticeably different and you can generally tell if a device is USB 3.0 simply by the blue USB connector it will have.
Your printer or keyboard will work in exactly the same way. Not only can you use a USB 2.0 device with a USB 3.0 Mac but a USB 3.0 hard drive will even work with a USB 2.0 Mac. USB 3.0 is still just as versatile and fully backwards-compatible with older USB devices. Some USB 2.0 drives come with a second USB cable that simply has an power connector on the other end if your Mac can’t provide enough power to the drive. It can also provide more power to devices. Currently, it’s only missing from the Mac Pro.
It first appeared on Macs in 2012 when Apple introduced the new Retina MacBook Pro and updated MacBook Air range. USB 3.0 theoretically tops out at 5Gbits/sec - around 10 times quicker. USB 2.0 can top out at a theoretical 480Mbits/sec. USB 3.0 is a huge improvement over USB 2.0 as it’s much, much faster. USB 3.0 is the latest iteration of the Universal Serial Bus format.
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