求助,关于隐藏根目录

assume cs:code code segment start: mov ah,00h mov al,12h int 10h mov dh,0h mov dl,0h mov ah,2h mov bh,0h int 10h mov ah,0ch mov dx,100h mov cx,100h mov al,12h int 10h mov ah,4ch int 21h code ends end

怎么把"D:\>"隐藏??
求助

assume cs:code code segment start: mov ah,00h mov al,12h int 10h mov dh,0h mov dl,0h mov ah,2h mov bh,0h int 10h mov ah,0ch mov dx,100h mov cx,100h mov al,12h int 10h mov ah,4ch int 21h code ends end