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Tests show Thunderbolt ports on M1 Macs don't fully support USB 3.1 Gen 2 speeds: Digital Photography Review
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USB-C and Thunderbolt: Understanding Ports and Cables for Macs, iPhones, and iPads - The Mac Security Blog
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Expand your iMac 24” connectivity with a front-facing USB hub that matches your Apple device color! - Yanko Design
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Amazon.com: Satechi USB C Slim Dock for 24” iMac with Tool-Free Enclosure for M.2 PCIe NVMe and SATA SSDs– USB C Data Port, USB A, 2 USB 2.0, Micro/SD Card Reader (Blue) :
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Expand your iMac 24” connectivity with a front-facing USB hub that matches your Apple device color! - Yanko Design
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Amazon.com: Anker 535 USB C Hub (5-in-1), with 2 USB-A 10 Gbps Data Ports, USB-C 10 Gbps Port, SD and microSD Card Reader, for iMac Pro / iMac 24 inch 2021 / iMac 27 inch / 21.5 inch : Electronics
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