I am having no luck changing the default icon on my SD card. I've got a .png and a .ico file. Opened in Preview, selected all and copied, then Get Info for the SD card, select the icon so it gets a blue line around, and then paste. I get prompted for the admin username and password which are correctly entered, then nothing happens. I've tried doing this on both the admin account, and also my normal user account (non-admin). Neither get's the icon changed. The SD card is Mac OS Extended (Journaled, Encrypted).