The correct answer is file system.A file system can be thought of as an index or database containing the physical location of every piece of data on the hard drive or another storage device.The data is usually organized in folders called directories, which can contain other folders and files.Files on a storage device are kept in sectors.Sectors marked as unused can store data, typically in groups of sectors called blocks.It's the file system that identifies the size and position of the files as well as which sectors are ready to be used.A file system doesn't just store the files but also information about them, like the sector block size, fragment information, file size, attributes, file name, file location, and directory hierarchy.