![]() That may be the bus speed, but the Apple SDXC readers in such Mac models do not have the pins to support it, since they do not deliver UHS-II speeds but lower UHS-I speeds. Tested in the real-world with UHS-II cards, which have an extra row of contacts (pins) as shown atĪ list of UHS-II SD cards, readers, and camerasĮven more, the "Apple - About This Mac - System Reports - Hardware - Card Reader" on such Macs shows "Link Speed: 2.5 GT/s" (250 MB/s), which again is not true. For insance, the iMac or Mac mini (late 2012) SDXC reader is compatible with UHS-II cards (reads/writes them), but at UHS-I speeds (100 Mbps) instead of UHS-II speeds (300 Mbps).
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