Robustly copying ISOs using dd
This blog post is going to assume that we’re writing to
/dev/sdX. Please change this to whatever disk you’re actually trying to write to. I bear no responsibility if you accidentally write to your OS drives.
Make sure the disk you wish to write to is unmounted.
sudo umount /dev/sdX
For good measure check
Then perform the writing operation
sudo dd bs=4M if=/path/to/distro.iso of=/dev/sdX conv=fdatasync status=progress
fdatasync will wait until the data is physically written into the drive before finishing.
Once that operation is done we can check to see if it is performed properly. This step will only work for ISOs that have prepared a file similar to
md5sum.txt that Ubuntu provides….
sudo mount /dev/sdX /mnt cd /mnt md5sum -c md5sum.txt
Hopefully you’ll see all
OK and we’re good to go!