FD/1= first floppy drive, FD/2= second floppy drive</br>
HD0/x, HD1/x, HD2/x, HD3/x = hard drives accordingly on IDE0 (Primary Master), IDE1 (Primary Slave), IDE2 (Secondary Master), IDE3 (Secondary Slave); x - partition number on the selected hard drive, starts from 1</br>
For CD-drives due to hardware limitations only subfunctions 0,1,5 and 7 are available, other subfunctions return error with code2.</br>
At the first call of subfunctions 0,1,5,7 to ATAPI devices(CD and DVD) the manual control of tray is locked due to caching drive data. Unlocking is made when subfunction 4 of function 24 is called for corresponding device.</br>