Can i use this cable to transfer data from a 2011 mac air to a 2017 MacBook pro?

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  • Yes, according to the Apple support document HT207266 "About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter".

    In the case of connecting a Thunderbolt 1 or 2 Mac (such as the MacBook Air (11-inch, Mid 2011)) to a Thunderbolt 3 Mac (such as the MacBook Pro (2017)), it says, "You can also use the Thunderbolt port of this adapter to connect an external hard drive, dock, Mac, or other device that uses a Thunderbolt or Thunderbolt 2 cable for data transfer. This adapter supports data-transfer speeds up to 10Gbps with Thunderbolt devices, and up to 20Gbps with Thunderbolt 2 devices."

    In the case of connecting Thunderbolt 3 devices to a Thunderbolt 1 or 2 Mac, it says "This adapter is bidirectional, which means you can use it to connect Thunderbolt 3 devices to a Mac that has a Thunderbolt or Thunderbolt 2 port. In that case, the Mac must be using macOS Sierra or later, and the device using Thunderbolt 3 (USB-C) must provide its own power."

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