X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3.2+ - ioctl

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INT 21 - DOS 3.2+ - IOCTL - GET LOGICAL DRIVE MAP
        AX = 440Eh
        BL = drive number (0=default)
Return: CF set on error
            AX = error code (see AH=59h)
        CF clear if successful
            AL = 00h block device has only one logical drive assigned
                 1..26 the last letter used to reference the drive (1=A:,etc)
SeeAlso: AX=440Fh,INT 2F/AX=122Bh

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