The CDROM image was a firmware upgrade image from Dell (based on Linux). Mounting the image with iDRAC, it worked nicely. As one of the Servers had a dying iDRAC (Dell R320), I needed an USB stick.

Repairs, surfing, virus check, complete system? The fact that a large USB stick offers space for 50 live systems should not tempt you to use it haphazardly. It’s all about making the right choice!

Linux PC booting slowly? This handy tool shows why in seconds - here's how ...