LG LGV400 - Manual (Page 19)

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Warning! Do not remove the microSD card without unmounting it first.
Otherwise, it may damage the microSD card as well as your tablet, and
the data stored on the microSD card may be corrupted.
Formatting the microSD card
Warning! All files stored on your microSD card are deleted when you
format the card.
1 From the Home screen, tap Apps > Settings > Storage.
2 Tap Erase SD card (twice).
3 If you set an unlock pattern, enter it and tap Erase everything. The card
will then be formatted and ready to use.
NOTE: If there is content on your microSD card, the folder structure may
be different after formatting since all the files will have been deleted.
Locking and unlocking the screen
If you do not use the tablet for a while, the screen will be automatically
turned off and locked. This helps to prevent accidental touches and saves
battery power. When you are not using the your tablet, press the
Power/Lock
Key to lock your tablet.
If there are any programs running when you lock your screen, they may be
still running in Lock mode. It is recommended that you exit all programs
before entering Lock mode to avoid unnecessary charges (e.g. web access,
data communications).