how do you write to the bootdisk of a floppy? I want my program to run when the disk is inserted.

===================================================================== in 16-bit asm code, compiled with TASM: .model small .code org 100h start: call boot ret org 7C00h boot: mov ax, 0301h ;write one sector mov bx, 7C00h ;from 0:7C00h mov cx, 1 ;to track 0, sector 1, head 0 mov dx, 0 ; on drive A: int 13h ; bios interrupt mov ax, 0301h ; do it once more int 13h ; to insure it works ret end start well, the above code is COPIED from a book, ie. NOT my own code. it works under DOS. in Win32, i don't know how, but i think it should quite similiar. int 13h will work before the operating system is loaded, as i know =) please don't use it with the wrong purpose.

Hi you need to be more clear on what you want to do. The above would write data into the mbr of the floppy and if no correct data the floppy will not work. Or do you want a short program that will auto run a program on the floppy like happens with most cds?

Is there a way to make a floppy autorun ? I thought floppy will ONLY autorun at boot time when it is inserted into the drive AND the option in CMOS change to allow booting from floppy first. If there is a way to make a floppy work like a autorun CD, yeah I want it (the program). Thank you!! I suppose the above asm program will only outwrite the boot sector of a floppy (with anything?). The floppy wont boot the computer and even won't print the message "not a system disk" (or somthing like that), since it is destroyed.