Use a memory card to store your multimedia files, such as video clips, songs, sound files, images, and messaging data.
Some of the folders in Gallery with content used by the phone (for example, Themes) may be stored on the memory card.
Some supplied memory cards are preformatted; others require formatting. When you format a memory card, all data on the card is permanently lost.
To set a password (maximum 8 characters) to lock your memory card against unauthorized use, select the memory card folder and Options > Set password.

The password is stored in your phone, and you do not have to enter it again while you are using the memory card in the same phone. If you want to use the memory card in another device, you are asked for the password.
To remove the password, select Options > Delete password.
To check the memory consumption of different data groups and the available memory to install new software to your memory card, select the memory card and Options > Details.