Datasheet

http://adafru.it/cfL

Get Card Info

The Arduino SD Card library has a built in example that will help you test the shield and

your connections

If you have an older Datalogging shield without the SPI header connection and

you are using a Leonardo, Mega or anything other than an UNO, you'll need to

install a special version of the SD library (http://adafru.it/ref)

Open the file CardInfo example sketch in the SD library: