- Joined
- Jun 13, 2020
- Messages
- 132
- Motherboard
- Gigabyte Z390 Designare
- CPU
- i7-9700K
- Graphics
- RX 580
This issue confused me for a while as well. I was somewhat disappointed to learn that most USB Type C cables do not support the higher transmission speeds of USB 3.x.
There's an important distinction between connector type and transmission protocol. The physical connector type such as USB-C supports several transmission protocols, including:
Whenever we look at a USB Type C cable, we assume it must support USB 3.x. That's what I thought for a long time, but it's false!
- USB 1.x
- USB 2.x
- USB 3.x
- Thunderbolt 3 (but this connector also has a "lightning" logo)
If you look at an HDMI connector, for example, you already know that some HDMI cables only support HDMI 1.4 and others are certified for HDMI 2.0. The same is true for DisplayPort. The physical connector looks the same, but we have DisplayPort 1.1, 1.2, and 1.4. Not all DisplayPort cables support all three of these transmission protocols even though the cables (the connectors) look the same.
So although your cable has a USB Type C connector on it, it might not support USB 3.x. How to tell? Easy... just do this:
- Connect your LaCie drive to a real Mac using the USB-C cable that came with the drive
- Run IORegistryExplorer on the real Mac
- Is the LaCie drive connected to a HSxx port or a SSxx port?
Both of my drives were using USB 3.1 ports?
Didn't see any HSxx but one of my Lacie2TB drives was using SSxx. So the solution here is to get a true thunderbolt cable or TB3 dock?