Computer file systems

contained block of information on a computer

concrete format or program for storing files and directories on a data storage device

in computing, a file system cataloging structure which contains references to other computer files, and possibly other directories

family of file systems originally developed by Microsoft

thumb|A hex dump of an executable [[real mode loader. The first column consists of addresses of the first byte in the second column, which comprises bytes of data in hexadecimal notation (least significant byte first), and the last column consists of the corresponding ASCII form.]]

portion of disk space containing the default operations.

file system that keeps track of not yet committed changes in a data structure called a “journal” (usually a circular log); when a system crash or power failure occurs, such file systems can be recovered online faster with less corruption

The system utility fsck (file system check) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD. The equivalent programs on MS-DOS and Microsoft Windows are CHKDSK, SFC, and SCANDISK.

contiguous, fixed-size block of sectors that some filesystems use as a unit of disk space allocation

logical or physical division of data storage media

file that is composed of one or more computer files along with metadata; used to collect multiple data files together into a single file for easier portability and storage, or simply to compress files to use less storage space

filesystem created for OS/2 operating system

filesystem object containing a reference to another object by path

file system directory on a multi-user operating system containing files for a given user of the system; located at <root>\Users\<username> in Windows 7 and above; at /Users/<username> in macOS; and at /home/<username> in Linux or BSD

Apple file system for macOS

computer program that combines files into one archive file (with or without compression)

general form of the name of a file or directory; resources can be represented by either absolute or relative paths

abstraction layer on top of one or more concrete file system, allowing applications to access files via a uniform logical representation

file system developed by Apple

directory entry that associates a name with a file

file system developed by Apple

activation of a filesystem instance so that the files it contains are available to applications

metadata associated with computer file that define file system behavior

right|thumb|Cylinder, head, and sector of a hard drive. Cylinder-head-sector (CHS) is an early method for giving addresses to each physical block of data on a hard disk drive.

file system term in computer science

Indexed Sequential Access Method (ISAM) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys. Indexes of key fields are maintained to achieve fast retrieval of required file records in indexed files. IBM originally developed ISAM for mainframe computers, but implementations are available for most computer systems.

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file format

parallel distributed file system

environment variable on Unix-like and MS-DOS-like operating systems

computer data storage architecture that manages data as objects

object in a filesystem marked to not be displayed by default

variable-sized, contiguous area of storage that some filesystems use as a unit of disk space allocation

Set of file system features

structure of file system that writes all information to a circular buffer

method of executing programs directly from long-term storage

partition on a data storage device that is used by computers adhering to the Unified Extensible Firmware Interface

describes a mechanism that restricts access to a computer file

pattern of organization of files and directories in a virtual filesystem

FTAM, ISO standard 8571, is the OSI application layer protocol for file transfer, access and management.

type of computer storage

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framework

query results presented as folders

class of file systems designed to run on flash memory

technique for providing atomicity and durability in database systems

boot sector of non-partitioned media in IBM PC compatible systems

decentralized filesystem

content publishing method

type of computer file existing on IBM mainframe operating systems

Undeletion is a feature for restoring computer files which have been removed from a file system by file deletion. Deleted data can be recovered on many file systems, but not all file systems provide an undeletion feature. Recovering data without an undeletion facility is usually called data recovery, rather than undeletion. Undeletion can both help prevent users from accidentally losing data, or can pose a computer security risk, since users may not be aware that deleted files remain accessible.

format for writable optical discs

computer disk partitioning scheme

filesystem transaction log

tree data structure similar to B+ trees