So 1 Gigabyte (GB) = 1000 Megabit (MB) = 8 Gigabits (Gb). Here we try to explain why this is happening so you can make a better choice when buying and external hard drive or external display for your Mac.įirstly, it’s important to understand the difference between Bytes and Bits which is how data transfer speeds are measured. This confusion has led to particular disappointment among Apple Silicon M1 Mac users who, even with the M1 Pro, M1 Max and M1 Ultra chips, have bought external hard drives promising incredibly fast data transfer speeds only to achieve less than half of what they claim to be capable of in reality. While Thunderbolt is relatively easy to understand because it was custom designed for Apple devices, USB-C with its various 3.0, 3.1, 3.2 and 3.2 Generation 2, 3.2 Generation 2×2 standards and the speed you get from them when connected to a Mac is complicated to understand. If you want to get an external hard drive or external display for your Mac then it will almost certainly have either a USB-C or Thunderbolt port to connect it to your Mac with. If you’re confused by the increasingly complicated world of USB-C, USB 3.2 Gen 2×2, Thunderbolt 3 and Thunderbolt 4, here we explain the difference in speeds and standards.
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