How to write on hard disk with bios interrupt 13h?

Your code is very messy. In order to properly use int 13h with AH = 3 you need to also set ES (the segment in which BX resides, e.g. ES:BX is the address of the buffer which should be read and written to the hard disk), and CX to a combination of the cylinder and sector number ( cylinder = CL7:6 || CH sector = CL5:0 ).

BIOS functions have input parameters. If you don't get all of the input parameters right, the BIOS function isn't able to guess what you meant. For the BIOS function you're using have a look at: ctyme.com/intr/rb-0608.htm.

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