Refers to how files are organized in a computer system.
Additional data added to a CD-ROM or DVD disc that defines the directory and file structure on the disc plus other information about the contents of the disc. A file system is necessary for all data storage media to allow data files to be accessed. File systems in use include ISO 9660 and UDF.
the physical or logical device that holds a collection of files and directories. This might be a hard disk drive or a partition on a disk drive.