HELP PLEASEEEE (regarding the address of SD card)

I know the starting address of a SD card is 266240. Can anyone please tell me what is the second address???

I want to write a data into a microSD card using a microcontroller from TI (MSP430), so first i will format my microSD card and save one .txt file there and after debugging and running my program, data will be stored there, but now i need to save 2 types of data, so i need to create another .txt file, but i dun know what is the address of it…

can anyone please tell me…

thank you soooo much