IMG

• https://roscopeco.com/2013/08/12/creating-a-bootable-hard-disk-image-with-grub2/

• dd vs fallocate vs qemu-img for creating .img file:

  • https://askubuntu.com/questions/1017309/fallocate-vs-dd-for-swapfile
  • dd does not leave holes (use bs=4M for faster copying)
  • fallocate is much faster, but leaves holes

• Prefer partx to kpartx as the latter is more complicated and relies on device mapper to support stuff, while all the former does is tell the kernel about some partitions