Initialize the SD card for use. Functions that read data from a SD card like drawBMP() and playFile() are dependent on this.
NB : This function uses a lot of memory, and may leads to undefined results if used in a complex sketch. It's recommended to not use this unless you are using the SD card.
Corrections, suggestions, and new documentation should be posted to the Forum.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.