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[DiagonalArg <1531404@xxxxxxxxxxxxxxxxxx>]

Phillip, the Atari Partition Table spec is located here:
http://drac030.krap.pl/APT_spec.pdf

You will notice that the header entry (bottom of p.2 to top of p.3) has
a signature at offset 1 ("APT").  It also has a sanity check at offset
5.  In addition, each partition entry points to both the previous and
next entry.  There are clearly sufficient tests here to see if there is
really an Atari Partition Table present or not.

I have filled six 2T disks, each with different random data, and I'm
always getting the same result.  There is no way this is happening
randomly.

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https://bugs.launchpad.net/bugs/1531404

Title:
  nonexistent partition in /dev, & lsblk/disk util misbehaving with
  randomized disks

Status in util-linux package in Ubuntu:
  New

Bug description:
  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.
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 15.10
  InstallationDate: Installed on 2015-08-31 (130 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Package: util-linux 2.26.2-6ubuntu3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Tags:  wily
  Uname: Linux 4.2.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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