INTERNAL STORAGE – Displays the total amount of space in the phone's memory. It's listed in Gigabytes and also on a colored bar graph with a color-coordinated list of all of the apps as well as the amount of memory they use. Remaining memory space is gray-colored.
SD CARD – Displays the total available microSD card space.
Unmount SD card – Releases the microSD card from phone use to safely remove it.
Mount SD card – Enables the phone to recognize the microSD card for use in the phone.
Erase SD card – Deletes all of the data stored on the microSD card.