The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter connects a Mac that has a Thunderbolt 3 port to a device that uses a Thunderbolt or Thunderbolt 2 cable.
These connection types are ever in flux, but these days, most external hard drives use a flavor of USB, or in rare cases, Thunderbolt. Right now, the fastest mainstream connection type is. As the name implies, a Thunderbolt hard drive is a hard drive with a Thunderbolt interface, which is a technology developed by Intel in collaboration with Apple. Thunderbolt is a data transmission protocol combining PCI Express data transmission technology and DisplayPort display technology.
This adapter is not compatible with USB-C ports that don't support Thunderbolt 3, such as USB-C hubs or the USB-C port on MacBook models from 2015 or later.
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Thunderbolt or Thunderbolt 2
Use the Thunderbolt port of this adapter to connect your Mac to a display that uses a Thunderbolt or Thunderbolt 2 cable. For example, you can use this adapter to connect your Mac to an Apple Thunderbolt Display or LG Thunderbolt 2 display.
This adapter is not compatible with displays that use DisplayPort or Mini DisplayPort, such as the Apple LED Cinema Display. Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort , though the ports have the same shape.
Data transfer
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Thunderbolt Port Hard Drive
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 supportst charge your Mac by connecting the adapter to an external Thunderbolt display or other device that delivers power over Thunderbolt.