run.sh currently makes qemu print this as the very first output:
WARNING: Image format was not specified for '_disk_image' and probing guessed raw.
Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
This is scary for people who don't know that this is normal, and
write operations to block 0 being restricted could be confusing
for some operations happening from within serenity too at some point.
So specify the 'raw' format explicitly, like the warning suggests.
Requires using -drive instead of -hda.
From `man qemu-system`:
Instead of -hda, -hdb, -hdc, -hdd, you can use:
qemu-system-x86_64 -drive file=file,index=0,media=disk
So use that, and also pass format=raw.
