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SD Card read on De2-70

Honored Contributor II

Hi all, 

I'm doing a project which requires to read file from SD Card and I have some troubles 

I write a txt file which contains "Hello world ! 1 2 3" to SD Card, then I use HxD to check its address. And here is the captured picture  

I don't know what the Offset is. And what the exact address that can help me to access the "H" character in "Hello world ! 1 2 3" ? 

Could you please help me ?
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