.. _file_system_errors:

File System Errors
====================

System Inconsistency
---------------------

.. figure:: fs_errors.png
   :align: center

* scandisk
* fsck (file system check)

Journaled File Systems
-----------------------

* Journaled File Systems provide aditional robustness and can be checked for
  errors faster, especially after a system crash.

* Transaction records or *Journals* are maintained for any file access
  activity. The journal is used to facilitate a file system check.  
  Files that are not in use at all, do not need to be checked. 
   


Fragmentation
--------------

* Fragmentation (not contiguous on the disk) naturally occurs as files are
  added, deleted and extended on a system.

* A fragmented disk can degrade the speed of file reads.

* Why is fragmentation somewhat less of a concern with :ref:`indexed_fs`,
  such NTFS or inode based file systems, than it is for :ref:`linked_fs`,
  such as FAT or FAT32?