This file format can be used to create Live USB environments through a low-level copy (for example with the Unix dd command) to a USB key.
Intel-based Macintosh computers have limitations when booting from USB devices – while the Extensible Firmware Interface (EFI) firmware can recognize and boot from USB drives, it can only do this in EFI mode.
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Windows 8 has a feature called Windows To Go, the Live USB system requiring the extraction of files into the USB drive and the installation of a bootloader.