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import pyb usb = pyb.USB_VCP() if (usb.isconnected()): print("d")
Class 10 is not the fastest, UHS/U3 is the fastest. I use Samsung EVO/U3 32GB and 64GB and they both work fine. Try formatting the card with exFAT.Do you know that class 10 cards work or do you recommend a different class perhaps? What class 32GB cards do you have at your disposal for testing?