It will be very difficult to make this work. The SPI bus can only have one master so you will need to disable the SPI bus on the Arduino that is not accessing the SD.You will need to close all files, disable the SPI controller on one Arduino and set the state of all SPI pins and chip select to inputs.You then need to initialize the SD card and open files on the other Arduiono.There is probably more that I haven't thought of.
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