You dd from one disk to another. You want to write the "image" of your source to the destination disk. That will give you an exact copy.

On Wed, Mar 13, 2019 at 12:24 PM Lu V <luvencl8@gmail.com> wrote:
Yea I am about to do the same (dd) but I see two partitions pop up when I plug in the SD card . Which do you back up? Or is my w10 doing something odd? 

Sent from my iPhone, Lu Vencl

> On Mar 13, 2019, at 3:02 PM, Jason <cturning1@gmail.com> wrote:
>
> I just struggled to use the win32diskimager to duplicate my Allstar card. It's not intuitive, so what worked for me was you have to set the destination file first, then it will let you read the SD card. Then when done you can write to a new card. I almost jumped over to my Linux laptop for dd.
>
> Jason - N6WBL
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