There are some situations where you'll wish you had one.

[Jenna] sent in a very cool bootloader she thought people might like. It’s called Micronucleus and it turns the lowly ATtiny 85 into a chip with a USB interface capable of being upgraded via a ‘viral’ ...

Universal USB Installer is a Live Linux USB Creator that allows you to choose from a selection of Linux Distributions to put on your USB Flash Drive. The Universal USB Installer is easy to use. The ...

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.