$ cat ./hd_sync.asm
; Filename      : hd_sync.asm
; Syntax        : none
; Description   : ia32 linux app: to sync hd
; Author        : Bain
; Notes         ; To build:$ nasm -f elf ./hd_sync.asm ; ld -o ./hd_sync ./hd_sync.o ; rm ./hd_sync.o


section .text
        global _start           ; required for linker

_start:
                                ; sync() is syscall 36
                                ; see: /usr/include/asm/unistd.h
        xor     eax,eax         ; clear eax
        mov     eax,0x24        ; make syscall to sync()
        int     0x80            ; interrupt (make call)
        xor     eax,eax         ; clear out eax
        mov     eax,0x01        ; syscall 1 (0x01) is exit()
        int     0x80            ; interrupt (make call)