![]() For most use cases, UHS-II is likely fine. While it’s great that the new MacBook Pros brought back the SD card slot, it’s a little disappointing that it doesn’t support higher speeds. According to the SD Association’s website, a UHS-II card could operate at 156MB/s in full duplex or 312MB/s in half duplex. Cards can also operate in a “half duplex” mode and use both lanes for one direction. This is because that’s the maximum full ‘duplex speed’ where one lane each is assigned to a “downstream direction” like transferring data from the host to a card, and the other assigned to “upstream” for transferring data from the card to a host. To further complicate all this, some UHS SD cards will show half of the speeds listed above. Ultra High Speed III (UHS-III) – 624MB/s.Ultra High Speed II (UHS-II)* – 312MB/s.We marked the ones supported by the new MacBook Pros with an asterisk (*) below: Next up are capacity categories, all of which the new MacBook Pros support:įinally, are the speed ratings.
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