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Loop device — a file as a disk

cheat sheet · Ubuntu 24.04 · util-linux 2.39 https://lab.dimsanych.ru/en/wiki/loop-device/

Cheat sheet

truncate -s 512M disk.img a 512 MiB file
sudo losetup -f --show disk.img attach it: /dev/loop0
sudo losetup -fP --show disk.img with partitions: loop0p1…
losetup -l what is attached to what
losetup -j disk.img which device a file is on
sudo losetup -d /dev/loop0 detach
sudo mount -o loop image.iso /mnt mount an image directly
lsblk -e 7 list disks without loops