Editing Power management (section)

==Operating system level: hibernation==
{{Main|Hibernation (computing)}}
When a [[computer system]] hibernates it saves the contents of the [[Random access memory|RAM]] to [[hard disk|disk]] and powers down the machine. On startup it reloads the data. This allows the system to be completely powered off while in hibernate mode. This requires a file the size of the installed RAM to be placed on the hard disk, potentially using up space even when not in hibernate mode. Hibernate mode is enabled by default in some versions of [[Microsoft Windows|Windows]] and can be disabled in order to recover this disk space.