File format in Ubuntu Disks when creating a partition image?

Question

linux

How can I open, view, copy files? testdisk will work?

Answer 1

This is a copy made with dd
Something like
sudo dd if=/dev/sdd2 of=/home/user/123.img
you can mount this image to any folder and view/change it with any file manager
mount -o loop /home/user/ 123.img /mnt/123