2. Extract the image file 2012-12-16-wheezy-raspbian.img from the downloaded .zip file.
3. Insert the SD card into your SD card reader and check what drive letter it was assigned. You can easily see the drive letter (for example G:) by looking in the left column of Windows Explorer. If the card is not new, you should format it and make sure there is only one partition (FAT32 is a good choice); otherwise Win32DiskImager can make corrupt your SD card!
4. Download the Win32DiskImager utility. The download links are on the right hand side of the page, you want the binary zip.
5. Extract the executable from the zip file and run the Win32DiskImager utility. You should run the utility as Administrator!
6. Select the 2012-12-16-wheezy-raspbian.img image file you extracted earlier .
7. Select the drive letter of the SD card in the device box. Be careful to select the correct drive; if you get the wrong one you can destroy your data on the computer's hard disk!
8. Click Write and wait for the write to complete.
9. Exit the imager and eject the SD card.
10. Insert the card in the Raspberry Pi, power it on, and it should boot up. There is an option in the raspi-config script that comes up to automatically expand the partitions to use all of the SD card if you have used one larger than 4 GB
In Windows the SD card will appear only to have a fairly small size - about 75 Mbytes. This is because most of the card has a partition that is formatted for the Linux operating system that the Raspberry Pi uses and is not visible in Windows.
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