Hardware Reference
In-Depth Information
Figure 12-4:
A SainSmart Ethernet shield with a micro-SD slot
Accepted SD Cards
The Arduino SD library can work with SD and SD-HC cards, all the way up
to 32 gigabytes. This limitation is mainly due to the i lesystem; Arduinos can
use FAT16 and FAT32 i lesystems but cannot use the newer, proprietary exFAT.
SD-XC cards are normally formatted with exFAT, but some people have reported
using SD-XC cards formatted to FAT-32.
An Arduino can work with any speed classes of SD-cards, but data throughput
will be limited when writing with an Arduino. You may want to buy a faster
card if you transfer data to and from a PC.
Limitations
Back in the days of Windows 3.11, i lenames were harder to deal with. They
were written in the 8.3 notation; i lenames could consist of only 8 letters, and
the extension (the text after the dot), could consist of only three letters. The
i lesystem did not differentiate between uppercase and lowercase letters for the
system; everything was written in uppercase letters. Files were seen as WIN
.COM, AUTOEXEC.BAT, and RECIPES.TXT. If you wanted to name a video
of your family on holidays on a tropical island, swimming in a crystal clear
sea, you had to be very creative. An extension to FAT allowed the use of LFN,
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