To add a password to your memory card, press the Menu key > Tools (or Settings) > Memory (or Memory card) > Options > Set password.
The password can be up to 8 characters long and is case sensitive. The password is stored in your Nokia device and you do not need to enter it again while using the memory card on the same device. Not all memory cards support password protection.
Note: If you use the memory card on another device or your Nokia device is reset, you will be asked for the password. Nokia is unable to reset or retrieve the password for a memory card.