Starting your Surface from a USB drive can be useful if you want to change firmware settings or Windows startup settings or if your Surface device does not turn on, start, boot, or wake from sleep.
The firmware included with the Raspberry Pi 2 Model B version 1.2 introduced the possibility of booting from a USB device: before that, it was only possible to boot from an SD or microSD card. But ...
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Why everyone should have a spare bootable Linux USB disk
There are some situations where you'll wish you had one.
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