I had considerable difficulty getting the 8G Micro SD card required for my recently acquired Raspberry Pi to format. I was using the recommended SD Formatter utility via a micro SD card adapter using the Card reader slot on my monitor and the slot on my PC front panel. In both cases I received the error message "SD Formatter disc not supported". I eventually the penny dropped, I tried using an external SD card reader, worked straight off, problem solved.
The question is why?
Link to Raspberry Pi - Getting Started