A file system or filesystem controls the data that are stored and retrieved. The information stored in a storage medium would be one large body of data and it cannot be known where one piece of information stops and the next begins without a file system. The information can be easily isolated and identified by separating the data into pieces and giving each piece a name. Each group of data is called a “file”. The structure and logic rules used to manage the groups of information and their names is called a “file system”. You can check the file system type of your system with the option ‘T‘. It will display file system type along with other information.