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df -honly shows filesystems. Until you create a partition and format it, you don't have a filesystem. Trylsblkwhich shows disks and partitions.wipefs(just in case, probably not needed),fdisk(orgdisk),mkfs.ext4(why so many tools?). Can you take it from here? (manis your friend). I understand you want to create everything anew, i.e. discard the old data whatever it is. What a great opportunity to experiment! There are only two scenarios where things get worse: (1) you confuse disks (e.g./dev/sdainstead of/dev/sdb;lsblkis also your friend; think twice twice); (2) random malfunction of the hardware.