DOS / Functions / 44 (IOCTL) / 08

              INT 21 - DOS 3.x - IOCTL - BLOCK DEVICE CHANGEABLE

Input	DOS1	N	DOS2	N	DOS3	Y	DOS5	Y	Output
AX	44h		08h		Fixed Code / Error Code				AX
BX			Drive (0=Def)						BX
CX									CX
DX									DX
ES:DI					Set if Error				CF

Fixed Code:     00h = Removable
                01h = Fixed
                FFh = Invalid