3.Select "Settings" from the menu.
4.At the bottom of the screen, you will see the total amount of free memory shown in megabytes on both your Kindle memory and SD memory card.
5.Additionally, the bars show the amount of free memory available in gray and the amount of filled memory in black as a relative reference.
The Settings Menu
The Settings menu allows you to go to other places on your Kindle as well as update your software or restart your device. These menu items are defined below.
Home — takes you to your Home screen.
Shop in Kindle Store — takes you to the storefront of the Kindle Store.
Update Your Kindle — installs the latest software for your Kindle. When an update is automatically loaded on your device, this menu item becomes available, otherwise it is grayed out.
Restart — restarts your Kindle.
Legal — provides trademark, copyright, and other notices about the software installed on your Kindle.