A disk space analyzer is a software utility for the visualization of disk

Disk storage

Disk storage or disc storage is a general category of storage mechanisms, in which data are digitally recorded by various electronic, magnetic, optical, or mechanical methods on a surface layer deposited of one or more planar, round and rotating disks...

 space usage by getting the size for each folder (including sub-folders) and files

Computer file

A computer file is a block of arbitrary information, or resource for storing information, which is available to a computer program and is usually based on some kind of durable storage. A file is durable in the sense that it remains available for programs to use after the current program has finished...

 in a folder or drive. Most of these applications analyze this information to generate a graphical chart showing disk usage distribution according to folders or other user defined criteria.

Main features

Features commonly present in this type of software:

• May scan files, folders, drives size
• Presents graphical utilization information chart
  Chart
  A chart is a graphical representation of data, in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart"...
  
  
• Lists files/folders according to configurable criteria

Extra features

Other common features of this category of programs:

• May export result to a HTML
  HTML
  HyperText Markup Language is the predominant markup language for web pages. HTML elements are the basic building-blocks of webpages....
  
  , XML
  XML
  Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....
  
  , Excel
  Microsoft Excel
  Microsoft Excel is a proprietary commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications...
  
  
• Can use to find duplicated files and folders
• Can calculate file checksum
  Checksum
  A checksum or hash sum is a fixed-size datum computed from an arbitrary block of digital data for the purpose of detecting accidental errors that may have been introduced during its transmission or storage. The integrity of the data can be checked at any later time by recomputing the checksum and...
  
  s
• May integrate with system shell
  Shell (computing)
  A shell is a piece of software that provides an interface for users of an operating system which provides access to the services of a kernel. However, the term is also applied very loosely to applications and may include any software that is "built around" a particular component, such as web...
  
  
• May use treemaps
• Can cleanup files
• May perform scheduled filesystem scans
• Can include and exclude certain files and folders in scan
• May present disk health indicators using S.M.A.R.T.