Editing Disk editor (section)

{{Short description|Computer software}}
[[Image:SpartaDOS X disk editor.png|thumb|right|upright=1.1|Disk editor on [[Atari 8-bit]] [[SpartaDOS X]] system]]
A '''disk editor''' is a [[computer program]] that allows its user to read, edit, and write raw data (at [[ASCII|character]] or [[hexadecimal]], [[byte|byte-levels]]) on disk drives (e.g., [[hard disk]]s, [[USB flash disk]]s or [[removable media]] such as a [[floppy disk]]s); as such, they are sometimes called ''sector editors,'' since the read/write routines built into the electronics of most disk drives require to read/write data in chunks of [[disk sector|sectors]] (usually 512 bytes). Many disk editors can also be used to edit the contents of a running computer's [[computer memory|memory]] or a [[disk image]].

Unlike ''[[hex editor]]s,'' which are used to edit [[Computer file|files]], a '''disk editor''' allows access to the underlying disk structures, such as the [[master boot record]] (MBR) or [[GUID Partition Table]] (GPT), [[file system]], and [[directory (file systems)|directories]]. On some operating systems (like [[Unix]] or [[Unix-like]]) most hex editors can act as disk editors just opening [[block devices]] instead of regular files. Programmers can use disk editors to understand these structures and test whether their implementation (e.g. of a file system) works correctly. Sometimes these structures are edited in order to provide examples for teaching data recovery and forensics, or in an attempt to hide data to achieve privacy or hide data from casual examiners. However, modifying such data structures gives only a weak level of protection and [[data encryption]] is the preferred method to achieve privacy.

Some disk editors include special functions which enable more comfortable ways to edit and fix file systems or other disk specific data structures. Furthermore, some include simple file browsers that can present the disk contents for partially corrupted file systems or file systems unknown to the operating system. These features can be used for example for file recovery.