content: The way you phrased that gives me the feeling that you don't actually know what a file system is or does. Just as a side note, with Ubuntu - as with any Linux - you have a choice between the following file systems: http://man7.org/linux/man-pages/man5/filesystems.5.html And these are just the ones integrated in the kernel, you can install others such as NTFS (Windows) or HFS+ (That apple-fs Linus is ranting about) as kernel modules. File systems are actually pretty interesting, I encourage you to start somewhere on Wikipedia and read your way to increasingly specific articles.