It's been a LONG time since I've posted, and this question(s) should be easy I've been recently playing around with a wide variety of Linux distros, just a beginner trying to learn. So I've been creating bootable USBs and running a live Linux desktop from there. My question is: How safe is this for the O/S on the hard drive? That is, either through carelessness or ignorance, how significant is the risk that one might inadvertently write to / write over files (especially O/S system files) on the HDD? Is it overly-paranoid to remove the HDD as a precaution? (p.s. google didn't provide any answers, so I'm guessing this is pretty much a non-issue). Thanks!