GParted is a Gnome Partition Editor. I downloaded it onto my Ubuntu-loaded PC. If your Linux PC doesn't employ a Gnome GUI but instead utilizes a KDE, then the GParted web-site also has one that works with KDE. You can use either a flash card reader built into your PC or an external flash card reader. Though intended principally to partition and format hard drives, GParted also quite easily accomodates the partitioning and formating of flash cards. Check both the web site http://gparted.sourceforge.net/ as well as the wikopedia entry for GParted. The web site contains a brief but thorough and quite comprehensible tutorial under "documentation."