If you have a Raspberry Pi with an SD Card larger than 2GB, then you may want access to all of the space available.
By default only 2GB is accessible.
The following will show you how to get all of your space.
NOTE: This will only work on the Debian image.
Step 1: Backup
You can use something like Win32DiskImager (for windows).
Using Win32DiskImager, do the following to back up:
1. Run Win32DiskImager
2. Create a file
3. Click the "Read" button
Now just wait for it to finish, then boot your Raspberry Pi.
Note: This process should not affect your data - but it is good form to back up anyway.