Arduino Function: SD.begin

Description

This function initializes the SD library and card. This begins use of the SPI bus (digital pins 11, 12, and 13 on most Arduino boards; 50, 51, and 52 on the Mega) and the chip select pin, which defaults to the hardware SS pin (pin 10 on most Arduino boards, 53 on the Mega). If you use a different chip select pin, the hardware SS pin must be kept as an output or the SD library functions will not work.

Syntax

SD.begin()
SD.begin(cspin)

Parameters

cspin (optional): the pin connected to the chip select line of the SD card; defaults to the hardware SS line of the SPI bus

Returns

 true: success false: failure


Based on the reference originally written by Arduino Community,  wiring.org.co and  arduino.cc