Note I figured this issue out in a later log. 

Bottomline - If the first block has 0x00 at location 0x000 then it's NOT a bootable SD image and the only thing that can be found in the record is the location of the First Partition Table at location 0x1BE-0x1C0.

The data from the SD card looks like:

The data should be:

The 0x55AA at the end matches. Not all SD sectors have this signature field. Not sure why I am not grabbing the right data.