Live USB

USB drive with a full bootable operating system / From Wikipedia, the free encyclopedia

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A live USB is a portable USB-attached external data storage device containing a full operating system that can be booted from. The term is reminiscent of USB flash drives but may encompass an external hard disk drive or solid-state drive, though they may be referred to as "live HDD" and "live SSD" respectively. They are the evolutionary next step after live CDs, but with the added benefit of writable storage, allowing customizations to the booted operating system. Live USBs can be used in embedded systems for system administration, data recovery, or test driving, and can persistently save settings and install software packages on the USB device.

Puppy_Linux_Xenialpup_7.5_CE.jpg
Puppy Linux, an example of an operating system for live USBs
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Ubuntu 8.04 running Firefox, OpenOffice.org and Nautilus

Many operating systems including Mac OS 9, macOS, Windows XP Embedded and a large portion of Linux and BSD distributions can run from a USB flash drive, and Windows 8 Enterprise has a feature titled Windows To Go for a similar purpose.

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