install/55357: Install medium should warn when installing on pendrive that NetBSD install img has booted from

[maccraft123mc%gmail.com@localhost]

>Number:         55357
>Category:       install
>Synopsis:       Install medium should warn when installing on pendrive that NetBSD install img has booted from
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 07 14:10:00 +0000 2020
>Originator:     macc24
>Release:        9.0
>Organization:
>Environment:
>Description:
I was trying to install NetBSD on my machine, and when choosing install target i accidentally chosen sd0 disk that was on top of list. Because my hard drive and pendrive were similar in capacity i thought that sd0 was my hard drive. In reality it was my pendrive and i just erased NetBSD install medium from it
>How-To-Repeat:
1. Put NetBSD install img on a big pendrive
2. Boot it on machine will small hard drive
3. Get confused whether hard drive is sd0 or wd0
4. Format pendrive
>Fix:
Maybe a warning that would warn the user if they are installing onto medium that NetBSD setup has booted from?
Or maybe hide medium that setup has booted from when selecting target hard drive?