File system
0File system, by Wikipedia https://en.wikipedia.org/wiki?curid=1010280 / CC BY SA 3.0
#Computer_file_systems
In computing, file system or filesystem （often abbreviated to fs） is a method and data structure that the operating system uses to control how data is stored and retrieved.
Without a file system, data placed in a storage medium would be one large body of data with no way to tell where one piece of data stopped and the next began, or where any piece of data was located when it was time to retrieve it.
By separating the data into pieces and giving each piece a name, the data is easily isolated and identified.
Taking its name from the way a paper-based data management system is named, each group of data is called a "file." The structure and logic
rules used to manage the groups of data and their names is called a "file system." There are many different kinds of file systems.
Each one has different structure and logic, properties of speed, flexibility, security, size and more.
Some file systems have been designed to be used for specific applications.
For example, the ISO 9660 file system is designed specifically for optical discs.
File systems can be used on numerous different types of storage devices that use different kinds of media.
As of 2019, hard disk drives have been key storage devices and are projected to remain so for the foreseeable future.
Other kinds of media that are used include SSDs, magnetic tapes, and optical discs.
In some cases, such as with tmpfs, the computer's main memory （random-access memory, RAM） is used to create a temporary file system for short-term use.
Some file systems are used on local data storage devices; others provide file access via a network protocol （for example, NFS, SMB, or 9P clients）.
Some file systems are "virtual", meaning that the supplied "files" （called virtual files） are computed on request （such as procfs and sysfs） or are merely a mapping into a different file system used as a backing store.
The file system mana...
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