Datasheet

Formatting under Windows/Mac

If you bought an SD card, chances are it's already pre-formatted with a FAT filesystem.

However you may have problems with how the factory formats the card, or if it's an old card

it needs to be reformatted. The Arduino SD library we use supports both FAT16 and

FAT32 filesystems. If you have a very small SD card, say 8-32 Megabytes you might find it

is formatted FAT12 which isnt supported. You'll have to reformat these card. Either way, its

always good idea to format the card before using, even if its new! Note that formatting will

erase the card so save anything you want first

Download the formatter from

https://www.sdcard.org/downloads/formatter_4/ (http://adafru.it/cfL)

Download it and run it on your computer, there's also a manual linked from that page for use

We strongly recommend you use the official SD card formatter utility - written by the

SD association it solves many problems that come with bad formatting!