![]() ![]() You don’t want a USB-C charge-only cable (typically unmarked ends) or a USB 3-only cable (typically a USB symbol and SuperSpeed+ or SS+, SS 10, or SS 20 label). If you already own a USB-C cable, check that it has a lightning bolt symbol on plugs at both ends it should also bear a 3 or 4, though Apple omits that, oddly enough. Buy it from a company that has a good track record, such as Anker, Belkin, CalDigit, and Other World Computing, to name four of many. It’s vitally important that you have a USB-C to USB-C cable designed for Thunderbolt 3 or 4. Both rates are far above gigabit ethernet. In my testing using a Thunderbolt 4 cable between two M1 Macs, I was able to get 4Gbps of sustained writes and 8Gbps of sustained reads using a speed-testing app, and 5Gbps in copying large files from one Mac to the other.
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