how can i write in sector 0 on hard disk

hi
how can i write on sector 0 on hard disk using asm

Why would you want to do that?

i have idea and i want to do it

There are interrupts that perform absolute read and absolute write functions, but they are very dangerous. you can ruin hard drives by writing on the wrong spots.

Q: Is this for building your own legitimate Microcontroller-type or prototyping project or are you trying to do something evil and become like a script kiddy or virus writer. Nobody will help you if you answer B.