Int 2F Fn 4A11  - Dblspace.bin - "deactivatedrive" - Unmount Compressed D  [k]

   AX = 4A11h
   BX = 0006h
   DL = drive number (0=A:) to unmount

Return: AX = status (0000h,0102h) (see #2490)

See Also: AX=4A11h/BX=0000h,AX=4A11h/BX=0005h