Have you set the U2X bit? (It doubles the UART baud rate).
http://store.nkcelectronics.com/arduino-runtime-board-rev-b.htmlBuild yourself up a little card like this and connect your SD card to it.Run it from 3.3V and 8 MHz, no special hardware adaptions will be needed to connect with the SD card.If you want it even smaller, use a 3.3V Promini.In either case, connect the SD card's VCC to the 3.3V power source directly.
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