25 Facts About File system

In computing, file system or filesystem is a method and data structure that the operating system uses to control how data is stored and retrieved.

The file system manages access to both the content of files and the metadata about those files.

Logical file system is responsible for interaction with the user application.

The logical file system "manage[s] open file table entries and per-process file descriptors".

The file system is responsible for organizing files and directories, and keeping track of which areas of the media belong to which file and which are not being used.

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File system fragmentation occurs when unused space or single files are not contiguous.

File system utilities create, list, copy, move and delete files, and alter metadata.

Utilities to free space for deleted files, if the file system provides an undelete function, belong to this category.

For example, it is not necessary to backup the file system containing videos along with all the other files if none have been added since the last backup.

Flash file system considers the special abilities, performance and restrictions of flash memory devices.

Tape file system is a file system and tape format designed to store files on tape.

The Linear Tape File System uses a separate partition on the tape to record the index meta-data, thereby avoiding the problems associated with scattering directory entries across the entire tape.

File system locking can be used as a concurrency control mechanism for individual files, but it typically does not protect the directory structure or file metadata.

File system locking cannot automatically roll back a failed operation, such as a software upgrade; this requires atomicity.

Network file system is a file system that acts as a client for a remote file access protocol, providing access to files on a server.

The File system wrote a sound to provide time synchronization, then modulated sounds that encoded a prefix, the data, a checksum and a suffix.

The File system would listen to the sounds on the tape waiting until a burst of sound could be recognized as the synchronization.

When floppy disk media was first available this type of file system was adequate due to the relatively small amount of data space available.

Recent addition to the flat file system family is Amazon's S3, a remote storage service, which is intentionally simplistic to allow users the ability to customize how their data is stored.

Sometimes the OS and the file system are so tightly interwoven that it is difficult to separate out file system functions.

For example, to access the files on a CD-ROM, one must tell the operating system "Take the file system from this CD-ROM and make it appear under such-and-such directory.

Various features have been added to the file system including subdirectories, codepage support, extended attributes, and long filenames.

The file system is supported with newer Windows systems, such as Windows XP, Windows Server 2003, Windows Vista, Windows 2008, Windows 7, Windows 8, Windows 8.

The system was designed to easily support removable disk packs, so the information relating to all files on one disk is stored on that disk in a flat system file called the Volume Table of Contents (VTOC).

In some cases conversion can be done in-place, although migrating the file system is more conservative, as it involves a creating a copy of the data and is recommended.

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