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How read and write sector to sd csrd using mci driver

Hi to all,
I am working on a project that on that i need to write and read a sector from sd card by using mci driver.
I know that i can use file system midellware and connect it to mci driver and working with mci, but interface of that is file but i want to work with sector.
Can any one offer me a way to use mci driver and work with sd card in sector resolution??