X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3+ - ioctl

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INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE CHANGEABLE
        AX = 4408h
        BL = drive number (0=default)
Return: CF set on error
            AX = error code (0Fh invalid drive) (see AH=59h)
        CF clear if successful
            AX = 00h removable
                 01h fixed
SeeAlso: AX=4400h,AX=4409h,INT 2F/AX=122Bh

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