Here is a quick tutorial how to start Debian and probably other Debian based distros from a USB Hard Disk. With USB Flash Drive usually there is no need for any custom actions.
1) Once the installer complains for missing CDROM and asks to load CDROM drivers select NO:
You can get the available device names by pressing ALT+F2 to enter a new console and type:
ls /dev/
or
dmesg | grep disk
Just remember, it has to be the fourth partition, e.g. /dev/sda4.
Next press ALT+F1 to return to the Setup screen.





Thanks for the helpful checklist — it made planning simpler.
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This topic is so relevant right now. Thanks for the timely post.
This gave me a whole new perspective on something I thought I already understood. Great explanation and flow!
This was a great reminder for me. Thanks for posting.
Very insightful — I’d love to hear your thoughts on related tools.
This was beautiful Admin. Thank you for your reflections.
This gave me a lot to think about. Thanks for sharing.
Thanks for sharing your knowledge. This added a lot of value to my day.