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Live USB
A live USB is a USB flash drive or a USB external hard disk drive containing a full operating system that can be booted. Live USBs are closely related to live CDs, but sometimes have the ability to persistently save settings and permanently install software packages back onto the USB device. Like live CDs, live USBs can be used in embedded systems for system administration, data recovery, or the testing of operating system distributions without committing to a permanent installation on the local hard disk drive. Many operating systems including Mac OS 9, Mac OS X, Microsoft Windows XP Embedded and many of the Linux and BSD distributions can also be used from a USB flash drive. Windows 8 is also capable of running from a USB drive, with Windows To Go.
== History ==
Since 1999, Apple Macintosh computers (beginning with the Power Mac G4 with AGP graphics and the slot-loading iMac G3 models)〔http://support.apple.com/kb/TA25908 Legacy Apple article about USB features in Macs with AGP graphics〕 have been able to boot from USB. Intel-based Macs support booting Mac OS X from USB.
Specialized USB-based booting was proposed by IBM in 2004, in the papers "Reincarnating PCs with Portable SoulPads" ((PDF ) & (Summary )) and (Boot GNU/Linux from a FireWire device ).〔(【引用サイトリンク】title=IBM brains capture a PC's soul )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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