10 . File System

File System

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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

 

1. Space managements

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

As a file system is used, files are created, modified and deleted. When a file is created, the file system allocates space for the data

File create and delete

2. File Name

A filename (or file name) is used to identify a storage location in the file system.

 

3. Directories

File systems typically have directories (also called folders) which allow the user to group files into separate collections.

This may be implemented by associating the file name with an index in a table of contents or an inode in a Unix-like file system.

 

4. Metadata

Other bookkeeping information is typically associated with each file within a file system.

1. Data length ( the number of blocks allocated for the file or as a byte count )

2. Time ( last modified may be stored as the file's timestamp / last accessed / creation time / the file's metadata was changed)

3. file's device type ( block , socket .. )

4. the length of the contents of a file

5. the file name

6. the location of the file