LG VS910 - Manual (Page 192)

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Settings
to synchronize data. Touch Remove Account to remove the account
along with all its data (contacts, mail, settings, and so on). You can’t
remove the first Google Account you added to your phone except by
resetting your phone to the factory defaults and erasing all of your
user data.
Privacy
Personal data
Factory data reset Erases all of your personal data from internal
phone storage, including information about your Google Account, any
other accounts, your system and application data and settings, and
any downloaded applications. Resetting the phone does not erase
any system software updates you’ve downloaded or any files on your
microSD card, such as music or photos. If you reset the phone in this
way, you’re prompted to reenter the same kind of information as when
you first started Android.
SD card & phone storage
Use the SD card & phone storage settings to monitor the used and available
space on your phone and on your microSD card, to manage your microSD
card, and if necessary, to reset the phone, erasing all of your personal
information.
SD card
Total space and Available space Lists the amount of space on any
microSD card installed in your phone and the amount you have available.
Unmount External SD card Unmounts the external microSD card
from your phone so that you can format the card or safely remove. This
setting is dimmed if there’s no external microSD card installed, if you’ve
already unmounted it, or if you’ve mounted the external microSD card on
your computer.
Format External SD card Permanently erases everything on the
external microSD card and prepares it for use with your phone. You must
unmount the external microSD card before you can format it.