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[Sitsofe Wheeler <1531404@xxxxxxxxxxxxxxxxxx>]

Sadly (as mentioned by psusi in comment 12) the kernel's Atari partition
detection is lax and triggers on lots of random data scenarios when
disks are big.
https://github.com/axboe/fio/issues/1942#issuecomment-3066162322 gathers
links to other "ADHI Atari partitions being created on disks containing
random data" discussions.

The problem was bad enough that Ubuntu disabled Atari partition support
in its *cloud* kernels in 2020 (see bug
https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/1908264 ).
Other distros such as Fedora have disabled Atari partition support for a
long time (here's a link to a Fedora 13 kernel config showing
CONFIG_ATARI_PARTITION not being set:
https://src.fedoraproject.org/rpms/kernel/blob/f13/f/config-generic ).
Given how few people need Atari partition support perhaps Ubuntu should
just disable it in all its kernels? Because this issue has expired
perhaps this is not the place to request that...

** Bug watch added: github.com/axboe/fio/issues #1942
   https://github.com/axboe/fio/issues/1942

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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:
  Expired

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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