O'Reilly NOOK Manual page 294

How many you can actually fit depends on what you put there. Figure that an
SD card can store about 1,000 books for every gigabyte of storage space, so a
32 GB SD card can hold an astounding 32,000 books! Even if you're a nonstop
reader, that should last you several lifetimes.
Of course, you'll likely store more than books on the SD card. You may store
magazines and newspapers as well. And that's where your mileage will vary.
Highly interactive magazines with plenty of high-resolution photos can weigh in
at an astounding 1 GB each. And if you store music files, they can add up as well.
Types of SD Cards You Can Use
When buying an SD card, make sure you buy one of the two formats that the
NOOK supports—microSD or microSDHC. What's the difference? It's right there
in the name. The HC in microSDHC stands for
are called microSDHC, while cards under that capacity are microSD.
Since microSDHC cards can hold more than microSD cards, and the cost differ-
ence isn't enormous, there's little reason not to spring for the HC variety. You
can generally find a 32 GB microSDHC card for $40 or under, so that size gives
you the most bang for your buck.
Make sure when buying a card that it is formatted with the FAT32 file system. As
a general rule, most or all are, but it doesn't hurt to check.
NOTE
MicroSDHC cards are rated by their class—Class 2, Class 4, and Class 6. Class 2 is the cheapest,
and Class 6 is the most expensive. If you don't see a class rating on the packaging, it's a Class 2 card.
The higher the class, the more quickly you can transfer files to it, but the class rating has absolutely
nothing to do with how quickly you can
cantly more expensive than Class 4 cards, and some people have had problems with them. To be on
the safe side, stick with Class 4.
Installing the Card
If you haven't installed a microSD card before, don't fret—it's a piece of cake.
Here's how:
Put your NOOK face down on a clean surface. Look down at the bottom
➊
right of your NOOK near the curved notch for a gray diagonal lid labeled
Nook.
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high capacity. Cards 4 GB or over
display books from the card. Class 6 cards tend to be signifi-