Apple’s new 2021 14-inch and 16-inch MacBook Pro SD card slot is SDXC (Secure Digital eXtended Capacity), but the company did not mention the supported transfer speeds. However, we now know that the SD card slot supports 312MB/s transfer speed, which means that its bus interface is UHS-II.
2021 MacBook Pro SD card slot is UHS-II
Dan Seifert from The Verge posted on Twitter that Apple confirmed to him that the new SD card slot is UHS-II, which means that the supported transfer speed is up to 312MB/s. To take advantage of these speeds, users will need to use UHS-II compatible SD cards.
Apple has confirmed to us that the SD card slot in the new MacBook Pro 14/16 is UHS-II (over 300Mbps). Not as forward looking as UHS-III (over 600Mbps) would be, but thank god it's not UHS-I (about 100Mbps) . https://t.co/MN1ZCLyC4T
— dan-dor the relentless (@dcseifert) October 19, 2021
Despite the latest and greatest features such as Thunderbolt 4 and USB4, the SD card slot’s UHS-II interface is not the fastest one that is available right now. There are faster speeds available such as UHS-III and SD Express, which support speeds up to 624MB/s and 3940MB/s respectively.
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