The resistor level shifters in this product don't work well with SD cards. The two 10k resistors result in 2.5 V on RX .http://www.sparkfun.com/datasheets/BreakoutBoards/Level-Converter-v10.pdfIn general resistor level shifters are not recommended for use with SD cards. The SD spec requires a maximum rise time of 10 ns for SPI signals. Resistor level shifters often produce sort of a sawtooth SPI signal.
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