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. It 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. Many Linux distributions make ISO images
available for burning to CD or DVD. While open source Operating Systems
can be used for free, some commercial software, such as Windows To Go requires a license to use.
Many Live CDs are used for data recovery, computer forensics, disk imaging, system recovery and malware removal. The Tails operating system
is aimed at preserving privacy and anonymity of its users, allowing
them to work with sensitive documents without leaving a record on a
computer's hard drive.[1][2]
The functionality of a live CD is also available with a bootable live USB flash drive, or even an external USB drive. Many live CDs offer the option of persistence by writing files to a hard drive or USB flash drive.
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