How does the file system on the operating system?

This is dependent on which operating system you have. For example, Win95 uses FAT or FAT16, Win 98 uses FAT or FAT32, NTFS is on Win200, XP, Vista, 7 Mac OS X uses HFS+And Linux-based OS's usually...

A file system is the method of storing files. Some examples include: Ext4 Ext3 FAT NTFS ZFS Reiser

An operating system enables you to view files saved onto your storage devices and arrange them into a folder/directory/file structure.

In *nix systems(Linux, Mac OS X, BSD, etc.) you can use the 'mv' command, in Windows-based systems use the 'move' command. Both types of systems usually allow you to drag and drop (or cut and paste)...

1.efficiency 2.Transparency.3.Consistency