INT 21,44,8 / IOCTL,8 - Device Removable Query

AH = 44h

AL = 08

BL = drive number (0=default, 1=A:, 2=B:, 3=C:, ...)

on return

CF = 0 if successful

= 1 if error

AX = 00 removable media

= 01 non-removable media

= error code if CF set (see ~DOS ERROR CODES~)

- used to determine if a device supports removable media

- RAM disks are not considered removable media

- device drivers compatible with DOS 2.0 do not always respond

correctly to this query

- implemented from DOS 3.0; for earlier DOS versions drive A: and

B: are removable media since DRIVER.SYS/SUBST are DOS 3.0+ only