Assuming something to do with SPI? 
Using Arduino UNO R3 with IDE 2.0 (MacOS)…is it a LINUX thing?
If you’re using Arduino UNO R3 and IDE 2.0 on macOS, it shouldn’t be a Linux-specific issue. The functionality of the SD card should work the same way on macOS as it would on Linux or Windows, provided the correct libraries are installed and the SD card is properly formatted (usually FAT16 or FAT32).
I assume the purpose of a SD card is to store data…
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