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Avoid using cards that are thicker than 2.1mm, as they might damage the SD card slot if you try to. Computers that use the PCIe bus express their speed as GT/s. Default Speed High Speed UHS-I UHSII (MacBook Pro introduced in 2021, iMac introduced in 2020, and iMac Pro only) To use smaller cards such as MiniSD and MicroSD, use an adapter: Secure Digital Input Output (SDIO) cards are not supported. Select Card Reader from the Hardware section (for Macs that use the PCIe bus to communicate with the SD card slot). Select Internal Memory Card Reader and look for the Speed entry. Select USB from the hardware section (for Macs that use the USB bus to communicate with the SD card slot). Mac desktops use the PCIe bus to communicate with the SD card slot and can transfer data at a faster rate.Ĭheck the packaging that came with your SD media to determine the maximum transfer rate used by that specific card.ĭetermine the maximum speed of your Mac using the System Profiler:Ĭhoose About this Mac from the Apple () menu. Xput Customizable USB OTG TF Micro SD Card Reader USB 3. Ultra High Speed (UHS) The Ultra High Speed (UHS) bus is available on some SDHC and SDXC cards. High Speed Mode (25 MB/s) was introduced to support digital cameras with 1.10 spec version. The notebooks also have three Thunderbolt 4. SD Cards will read and write at speeds of 12.5 MB/s.

Mac notebooks use the USB bus to communicate with the SD card slot and have a maximum speed of up to 480 Mbit/s. Ceamere CR51 High Speed USB 2,0 TF M2 Memo SD T-Flash Mini SD TF. The SD card slot is one of three ports that returned to the new MacBook Pro models after being removed in 2016, alongside an HDMI 2.0 port and MagSafe. What is the maximum speed that my computer can use when reading and writing to an SD card in the SD card slot?