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By default `dd` writes all bytes from raw images 1:1 to the disk. Some images, like Flatcar, have a lot of zero blocks in them. They have a large partition table with 1GB for the UEFI partition, 2GB for system A and B each, another 1GB for OEM and 6GB for the user. Most of these are just zero blocks, but we currently still write them to disk. By using `dd conv=sparse`, dd automatically skips writing these blocks to the disk, which results in a quicker process, as fewer bytes need to be written. The resulting image is the same, as "zero" is also the default for the blocks after our `blkdiscard` command. I did not benchmark this properly, so you have to trust me on this one.