old/ASM/Disk Low Level IO/Eject.asm

.model small
.code

org 100h

start:

mov ax, 440Dh     ; generic IOCTL
mov bx, 'Q'-'@'   ; see below
mov ch, 8         ; device category
mov cl, 49h       ; Eject Removable Media
int 21h

int 20h
end start