Interrupt 21h Function 440Dh Minor Code
49h
Ejects the
specified media.
mov ax, 440Dh
; generic IOCTL
mov bx, DriveNum
; see below
mov ch, 8
; device category
mov cl, 49h
; Eject Removable Media
int 21h
jc error
Parameters
DriveNum
Drive to
eject. This parameter can be 0 for default drive, 1 for A, 2 for B, and so on.
Return Value
Clears the
carry flag if successful. Otherwise, the function sets the carry flag and sets
the AX register to one of the following error values:
|
01h |
The
function is not supported. |
|
B1h |
The volume
is locked in the drive. |
|
B2h |
The volume
is not removable. |
|
B5h |
The valid
eject request has failed. |
Remarks
If a given
physical drive has more than one logical volume, all volumes must be unlocked
by using Lock/Unlock Removable Media (Interrupt 21h Function 440Dh Minor
Code 48h) before the
drive will eject.