64 GB SD card with Samsung s3 mini
Easy solution for anybody with a card-reader in their pc. (Relaid from: forum.xda-developers.com/)


Place the card in your PC's card reader and determine the drive designation (i.e., G:\, H:\, etc.)
Download the fat32format utility in GUI version from here: http://www.ridgecrop.demon.co.uk/guiformat.exe. Click on the picture to retrieve the file.
Launch the guiformat.exe.
Choose the drive that corresponds to your SD card.
Choose the size of the SD Card you are formatting.
Check the Quick Format box.
Press Start.


Source: http://forum.xda-developers.com/showthread.php?t=1773735