This will be a menu option in the future. This version has the chip select pin hard coded as the SPI SS pin. It chooses the best file system, FAT16/FAT32, the optimum cluster size, and aligns file system structures on the card's flash erase boundaries. For smaller cards, 16 - 64 MB, it use FAT16 instead of FAT12. PC/Mac/Linux format utilities do not comply with the above standard and do not produce optimal file system structures for the Arduino.įor SD/SDHC cards larger than 64 MB this sketch attempts to match the format generated by the formatter. It only runs on PCs and formats small SD cards as FAT12. I decided to write SdFormatter.pde since the only program I know that complies with the SD File System Specification is here: It is included as one of the examples, SdFormatter.pde, in the 20110414 beta of SdFat: I finally decided to write a sketch to format SD cards. For three years I have been trying to find an easy way to correctly format SD cards for optimal use on the Arduino.
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