I'm looking to get a Samsung Portable T5 2TB USB 3.1 SSD and have an iMac with tb2 ports would this adapter work?

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    The Thunderbolt 3 to Thunderbolt 2 adapter is for Thunderbolt devices only.

    The Samsung Portable T5 2TB USB 3.1 SSD is a USB device. It comes with a USB-C to USB-A connector so you can connect it to one of the iMac's USB ports.

    The iMac's USB ports are USB 3.0 allowing up to 5 Gb/s which might get you up to 430 MB/s from the T5.

    To add USB 3.1 gen 2 (up to 10 Gb/s) to the iMac, you could use a Thunderbolt 3 dock attached to the iMac using the Thunderbolt 3 to Thunderbolt 2 adapter. You would connect the T5 to the second Thunderbolt 3 port of the Thunderbolt 3 dock which could allow you to get up to 540 MB/s from the T5.

    A Thunderbolt 3 dock to get one USB 3.1 gen 2 port is not worth the expense.

    Another option is a Thunderbolt 2 PCIe enclosure (or Thunderbolt 3 PCIe enclosure plus Thunderbolt 3 to Thunderbolt 2 adapter) with a USB 3.1 gen 2 PCIe card which would get you at least two USB 3.1 gen 2 ports. But that is still expensive.

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