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→Live Linux CD
[[Image:linux-distro-2.png|thumb|right|150px|Knoppix is a popular Live Linux CD Distribution.<br>(Image licensed under[https://creativecommons.org/licenses/by-sa/3.0/ cc])]]
''A live CD (also live DVD, live disc, or live operating system) is a complete bootable computer installation including operating system which runs directly from a CD-ROM or similar storage device into a computer's memory, rather than loading from a hard disk drive. A Live CD allows users to run an operating system for any purpose without installing it or making any changes to the computer's configuration. Live CDs can run on a computer without secondary storage, such as a hard disk drive, or with a corrupted hard disk drive or file system, allowing data recovery.<br><br>As CD and DVD drives have been steadily phased-out, live CDs have become less popular, being replaced by live USBs, which are equivalent systems written onto USB flash drives, which have the added benefit of having write-able storage. The functionality of a live CD is also available with a bootable live USB flash drive, or an external hard disk drive connected by USB.''
Reference: https://en.wikipedia.org/wiki/Live_CD