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I have two 2T disks with no partition table and which have been filled
with random data.  GNU parted shows nothing on this disk:

GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Error: /dev/sda: unrecognised disk label
Model: ATA WDC WD2002FAEX-0 (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

but when I check with `lsblk`, I see one disk with partitions and the
other without:

Code:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 1.8T 0 disk
└─sda2 8:2 0 1.6T 0 part

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 1.8T 0 disk

and the Disks utility agrees (see: http://ibin.co/2SQv4KbH06Mz).

Also, /dev/disk/by-id contains an entry pointing to sda and one pointing
to sda2. So it really does think there's a second partition there.

Thinking there was something wrong, I re-filled the disks with random
data.  Now sda is properly (in the Disks utility as just an "unknown
disk"), but sdb shows a second partition, and identically to how sda was
showing it before (ie the Disks utility output is the same with 181GB at
the beginning and 128GB at the end).

I am running all this from the Ubuntu Gnome 15.10 installer disk.

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
nonexistent partition in /dev, & lsblk/disk util misbehaving with randomized disks
https://bugs.launchpad.net/bugs/1531404
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