Did you reboot after filling the drive with random data? Also please run sudo blkid -p /dev/sda ( or whichever disk is effected ) and post the output.
** Changed in: util-linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1531404 Title: nonexistent partition in /dev, & lsblk/disk util misbehaving with randomized disks To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1531404/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs