If you are using the card in two different devices with different formats (e.g. a Digital Camera and a MP3 player) we would advise you to use two separate cards.
If formatting in the Card Reader (WARNING: FORMATTING CAN & WILL DELETE ALL DATA) please see you device or camera manual before proceeding with a format.
Be aware, by default Windows will format a memory card of 2GB or higher capacity to FAT32.
Formatting in a PC:
Open My Computer
Locate the drive letter of your memory card
Right-click on this drive
Select Format... (This will launch the Format Utility Window)
Under the option File System select FAT32
Click on the Start button