The normal common file system is ext2 or 3.
Ubuntu uses the ext4 file journaling system, which doesn't get fragmented.
By default it should be using the ext3 file system, but you have a choice of several, including ext2, reiserfs, etc. Newer versions of Ubuntu tend to install as ext4 file systems, however if you've upgraded from an older version then you'll keep your original file system.
Since Ubuntu is installed as an ext4 file system (not NTFS as in Windows), there is no need to defragment anything.
Almost all Linux file systems are secure, so you're best off using latest non-development file system: ext4
WAV is a file format. There is no difference between a WAV file on Ubuntu and a WAV file on Windows.
Ubuntu uses many file formats, many of which are shared with Windows and Macintosh. The partition format the Ubuntu generally uses is an ext4 filesystem.
Ubuntu is a "distro" of the Linux operating system.
Yes, Ubuntu is an operating system, that uses the Linux Kernel.
Ubuntu - operating system - was created on 2004-10-20.
Ubuntu is free, it can not be pirated.
The default file manager in Ubuntu (Unity and GNOME) is Nautilus. In Kubuntu and KDE, it is Dolphin. You can install other file managers, such as Konqueror, and Thunar.
Windows viruses do not affect the Ubuntu system .