This is not possible using the recommended installation methods. Tails is designed to be a live system running from a removable media: USB stick or DVD.
No. Those installation methods are unsupported. They might not work at all, or worse: they might seem to work, but produce a USB stick that does *not* behave like Tails should. Follow the [[download and installation documentation|install]] instead.
If installed onto a USB stick, then it would be impossible to verify that the Tails on the USB stick is genuine. Trusting that a Tails USB stick is genuine should be based either on cryptographic verification or on personal trust (if you know someone you trust who can clone a Tails USB stick for you). But once Tails is installed on a USB stick it is not possible to use our cryptographic verification techniques anymore. Being able to trust your Tails USB stick is something that we really care about.