[codemeisterx86]

I have been having problems trying to figure out how to use the int 13h interrupt in assembly x86 assembly language. So I am requesting some example code: Can anybody give me some code in x86 assembly that allows me to write and read data to and from a floppy disk. (I can get the disk to spin, make noise, and even write stuff to it but I have not been able to control the data that it writes.) For example, if I wanted to write the character 'a' to sector 1 of a floppy disk, and then retrieve it and display it on the screen later, how would I do that? Also, is there a way to access individual bytes on a disk, or can you only read and write sectors? Thanks for your time.
-Codemeisterx86