Casio verizon User Manual page 224

Sleep: Opens a dialog where you can set how long to wait after you've
touched the screen or pressed a key before the screen turns OFF. For
the best battery performance, use the shortest convenient timeout.
Font size: Select which size font is displayed.
Storage
Data Storage
Internal Storage and SD Card: Displays about Internal storage or SD
Card.
INTERNAL STORAGE
Total space: Displays the amount of space on internal storage, and
the amount of space you have already used to store Apps, Photos,
Videos, Audio, and other files.
Available: Shows the amount of internal phone storage used by the
operating system, its components, applications (including those you
downloaded), and their permanent and temporary data.
SD CARD
Total space and Available: Displays the amount of space on the
microSD card installed in your phone, and the amount of space you
have already used to store photos, videos, music, and other files.
Unmount SD card: Unmounts the microSD card from your phone so
that you can format the card or safely remove it when the phone is on.
This setting is dimmed if there is no microSD card installed, or if you
have already unmounted the microSD card.
Erase SD card: Permanently erases everything on a microSD card
and prepares it for use with your phone.
USB
Ask on plug: Check to display the pop-up menu for selecting USB
mode when using the USB connection.
USB Connection: Select Charge Only, Media device(MTP) or
Camera(PTP) to change USB connection mode.
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