Strange way of getting there but I did achieve what I set out to do. Openmediavault running on one usb drive. No sd card needed.

Thanks to 52Pi / Geekpi for sending me this excellent case to test

Wikipedia link https://wiki.52pi.com/index.php?title=ZP-0141

As an Amazon Associate I earn from qualifying purchases

UK 52Pi nas case https://amzn.to/3KihGEZ
US 52Pi nas case https://amzn.to/417dP3n
DE 52Pi nas case https://www.amazon.de/dp/B0BRSQV68H/

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My Amazon UK store
https://www.amazon.co.uk/shop/leepspvideo

Amazon UK Links
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My capture device Avermedia GC513 https://amzn.to/2MnbXhW

My videos

Terminal commands used in video

Openmediavault install
sudo wget -O – https://github.com/OpenMediaVault-Plugin-Developers/installScript/raw/master/install | sudo bash

Remove desktop environment
sudo apt purge xserver* lightdm* raspberrypi-ui-mods

Openmediavault without sd card. Pi 4 setup 2GB, 120GB M.2 sata drive not nvme

source