Int 2F Fn 4A11 - Dblspace.bin - "getextrainfo" - Determine Number Of Dis [d] AX = 4A11h BX = 0009h DL = compressed drive number (0=A:) Return: AX = status (see also AX=4A11h/BX=0001h) 0000h successful CL = number of DISK_UNIT structures allocated (see AX=4A11h/BX=0005h) See Also: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h