This MicroSD module board is a small shield that you can connect to your Arduino Uno or Arduino Mega board to add 2 GB of non-volatile Flash storage. A 2GB microSD card is included.
The SD card socket connects to the AVR microcontroller's SPI port. Download the libraries from the link below to read/write to the SD card.
MicroSD Module 2GB for Arduino Documentation MicroSD Module Tutorial
SD_uFA Library documentation (developed by David Cuartielles)
Arduino Mega Connection and SD_uFA Library Download