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As FvM have help point out, there is a difference in address format between standard HC and SDHC. I guess ur card is SDHC, thus do not need to *512.
From physical layer simplified spec v4.1(pg60) it says :
"SDHC and SDXC use the 32-bit argument of memory access commands as block address format...
I was facing the same problem as you a few days ago. Below is what i understand, hope it helps.
Experts : if i'm wrong, pls correct me.
The 1st 512 is boot sector call MBR not LBR. The boot sector you were trying access is LBR. LBR location can be calculate from MBR (offset location 0x1C6 ...
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