Inserting the SD Card
The Raspberry Pi requires an SD card with the operating system on it to start up. If you don’t have one, see Chapter 2 for advice on downloading the operating system and copying it to an SD card.
To insert your SD card, flip your Raspberry Pi over (see Figure 3-2) so you’re looking at its underside. On one of the short sides is a plastic fixture for your SD card. Slide the SD card in with the label side facing you and gently press the card home to make sure it’s well connected. The fixture is not big enough to cover your SD card, so most of the card will stick out from the side of the board and will be visible when you turn your Pi back over again.
Figure 3-2: The SD card, correctly aligned with the socket on the underside of the Raspberry Pi.