Function 4408h Does Device Use Removable Media

mov bl, Drive ;0 = default, 1 = A, 2 = B, etc.

mov ax, 4408h ;Does Device Use Removable Media

int 21h

jc error_handler ;carry set means error

cmp ax, 0 ;zero means removable media

jne not_removable

Does Device Use Removable Media (Function 4408h) determines whether the specified device contains a removable storage medium, such as a floppy disk.

Parameter

Drive

Specifies the drive to check (0 = default drive, 1 = A, 2 = B, etc.).

Return Value

If the function is successful, the carry flag is clear and the AX register indicates whether the storage medium in the specified drive is removable (register contains 0000h) or not (register contains 0001h).

Otherwise, the carry flag is set and the AX register contains an error value, which may be one of the following:

Comments

Does Device Use Removable Media returns error value 0001h (ERROR_INVALID_FUNCTION) for a network drive or for a device driver that does not support the function request. In these cases, the calling program should assume that the storage medium is not removable.