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Microsoft Windows users are familiar with the terms FAT32, or NTFS, which refers to types of file systems. Android devices are developed on Linux, which is based on UNIX. Linux users are familiar with good old ext2 file system. Well, your Android device may use an updated Linux file system, such as ext4, or a proprietary file system by a manufacturer, depending on who made the device and and what has been done to it by the user. Samsung Galaxy S phones use the Samsung RFS proprietary file system while the Samsung Nexus S with Android 2.3 uses the Linux Ext4 file system. The new open standard Ext4 file system seems to be the popular standard. Android phones use the Linux kernel, and as many linux users know, linux can support a large number of operating systems. The SDCard may be formatted ext3 or YAFFS (citation needed - verify example)