A loopback device in Linux is a virtual device that can be used like any other media device. … The loopback filesystem associates a file on another filesystem as a complete device. This can then be formatted and mounted just like any of the other devices listed above.

How do I create a loop device in Linux?

When you run it as root, losetup -f will automatically create loop devices as needed if there aren’t any free ones available. So rather than doing it yourself with mknod , the easiest way to create a new loop device is with sudo losetup -f .

What does Dev loop mean?

/dev/loop* are loop devices making plain files accessible as block devices. They have nothing to do with RAM occupation. They are typically used for mounting disk images, in your case apparently for Ubuntu Snap.