Sd card writing

Hi all,

I am trying to write a single block on SDHC card, but it always write multiple blocks.

I have set the correct values for single block writing i.e : data_sig <= x"FE"; instead of data_sig <= x"FC" and in send command I used command 24

But it still writing continuously and I have to make the address counter in increasing manner to write the data !

Any notes about this ? Many thanks.