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 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1531404/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
