Virtualize disk with minimal space

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  • Clean things up
  • Boot from separate media e.g. boot-repair live iso, shrink partition to desired size with gparted
  • On other system connect disk, check partition layout with fdisk -l, dd if=source of=file bs=[Units in fdisk] count=[end of last partition +1 to cover last +33 for backup gpt table if gpt] (https://serverfault.com/a/853753 https://forums.raspberrypi.com/viewtopic.php?t=288670#p1745543)
  • Boot from separate media with image attached, gparted likely will show unpartitioned
  • If GPT disk: use sgdisk -e /dev/disk to recreate backup gpt partition table at end of disk (https://askubuntu.com/a/1370440)
  • If wanting to make a sparse qcow2 image:
    • Mount image, fill empty space with zeroes with dd if=/dev/zero of=tmpfile, rm tmpfile
    • qemu-img convert -f raw -O qcow2 -S 4k [source] [dest]
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