@jongary Recent OS? I remember having to fiddle around to get Disk Utility to show a disk that was formatted ext4 a few weeks back. Don’t remember the steps, but after I unmounted it, then Disk Utility behaved better.
@jongary Yeah. After I fiddled with Disk Utility for a while, it offered to repair, and then when I said no, I could finally reformat the disk, but there was no indication it was checking the disk other than a blinking drive light.