String buffer in assembly and BIOS Inturrupts

Question

I am trying to write a string into sector 2 of a hard-disk. It seems to be failing. Here is the code I have at the moment:

xor ax, ax
mov es, ax    
mov cx, 1     
mov dx, 0080h 
mov bx, NameString 
mov ax, 0301h 
int 13h

NameString db 'string', 0

Thank you guys!

Answer 1

The address of NameString needs to be in es:bx but you're zeroing es. Load es correctly and it will work.

Answer 2

Looks like you're attempting to write to sector 1, not sector 2.

An insane thing to try to do at this stage of the game, IMO, but I suppose it's a "fake" hard drive so you probably won't break anything critical... I hope...

Best, Frank

Answer 3

Im not familiar with writing on the hard-disk, but can this be usefull to you? How to write on hard disk with bios interrupt 13h