I formated my flashcard by accident to a smaller size as it normally has (eg. 2GB instead of 4GB).
Please use the following tool to recover the full size of the device. This tool starts a "low level format" and may take some time. You have to start this tool only on windows XP.
NOTICE: all files on the device will be deleted, so we recomend you backup the files before using the tool. Choose the device carefully, because you can also choose your local harddisk drive. The tool will then fully erase your hard drive.