ubuntu - use a disk without paritioning it?
Solution 1:
As @Bib says in a comment above...
Creating a filesystem on a bare disk, without partitioning, is fully possible; you might even succeed overwriting a previous partition table/actions (clearing it? I have never tried that).
But then, I would not be surprised if there is at least one OS in the world that might not be 'happy' with it.
That would be:
$ sudo mkfs -t ext4 /dev/sdb