As a Windows user, you must be family with FAT32, exFAT and NTFS. File system is widely used on various storages devices such as hard drive, flash memory, virtual disk, etc. There are many different types of files system, and each has its own structure and logic rules, speed, size, etc. The structure and logic rule used by system to manage data is called a file system.

Information stored on device media is split into two pieces, which are usually called metadata and user data. Without file system, files stored on a device would be one large body of data, as data does not know where to stop or when to begin.