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  • The SD card interface is far more complex than you can imagine. It can operate at various voltages and clock speeds. Data transfers can use a 1-bit (default) or 4-bit data bus. It would be interesting if you could obtain such low-level details of the operational mode of the SD card in each circumstance. I have no idea how you could do that in Windows.
    – sawdust
    Commented Feb 18 at 2:14
  • @sawdust - more stuff happened since last time, but to answer you - now it looks like all is well... Which bugs the heck out of me even more than the problems described.
    – AcePL
    Commented Feb 18 at 13:03