Question USB-A to USB-C cable: different performance when I rotate the plug?!

Apr 17, 2023
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Hello.

I have a system with a USB3 Type-A port, and an external hard drive with a USB3 Micro Type-B port. Not very unusual, I guess. For some reason, there are some adapters along the way, because it needs to be a Type-C connection somewhere (for my magnetic adapters). So the cable path is a Type-A plug, then a Type-C plug, the magnetic adapter, a Type-C port, and finally a Micro Type-B plug. The magnetic adapter is not so interesting for my issue; you can just ignore it.

But now something happens that surprised me: Depending on how I plug the Type-C plug in the port, the speed is either about 300MB/s or 30MB/s.

At first I suspected a broken cable or adapter. Then I found a tiny note on the cable which says that exactly this can happen.

Is that usual? Why is that? Or is the cable bad? Can I solve that somehow?
 

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