macOS prevent from accidental unmounting

prevent_unmount.sh

#!/bin/bash
# https://stackoverflow.com/a/23716566
screen -D -RR test1 -X quit || true
screen -dmS test1
screen -r test1 -p 0 -X stuff $"cd /Volumes/SDUltra ^M"

https://stackoverflow.com/a/23716566

Where the return character, ^M, you need to enter using vim as
CTRL-V ENTER ESCAPE

https://tech.bejond.org/2020/05/05/How-to-make-mac-run-shell-on-startup/

/Library/LaunchAgents/prevent_unmount_service.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>EnvironmentVariables</key>
    <dict>
      <key>PATH</key>
      <string>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:</string>
    </dict>
    <key>Label</key>
    <string>prevent_unmount_service</string>
    <key>ProgramArguments</key>
    <array>
    <string>/Users/hcshin/prevent_unmount.sh</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <false/>
    <key>LaunchOnlyOnce</key>        
    <true/>
    <key>StandardErrorPath</key>
    <string>/tmp/startup.prevent_unmount_service.stderr</string>
    <key>UserName</key>
    <string>hcshin</string>
    <key>GroupName</key>
    <string>admin</string>
    <key>InitGroups</key>
    <true/>
  </dict>
</plist>