On 04/19/2017 04:41 AM, jack4747@gmail.com wrote:

> dd will copy EVERYTHING, even empty space.
> And also partition table etc. so the result will be a 3TB disk with a 500GB
partition, that you then have to expand using parted or similar.

I've seen this in action, I like to dd an uninstalled Raspbian...just in case.
dd a 8GB microSD into a iso image on the desktop computer.  Which ends up being
8GB in size, although compression usually works well on them.
dd that 8GB image to a 32GB and end up with 24GB of unallocated space.

So basically in order to simply use dd the drives should be the same, otherwise
there's more involved.

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