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.
How-To Geek on MSN
Stop using Rufus to make bootable USBs—this free, open-source alternative makes them far more useful
Your USB drive should be able to store and boot as many operating systems as its storage capacity allows.
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