HI Pseddon
The sd card is not supplied with 5 volt, the diode in serial shutdown the voltage to (5-0.6*3)VOLT
for the signal bus the resistor limit the current,and the sd card got protect diode Inside
Its works since several mounths like this
no problem for the moment.
HI Paulvk
external oscillator 32mhz is also good for atmega32 and atmega328 and surely other, but it is the upper limit max
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