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INT 21 - DOS 3.0+ - IOCTL - CHECK IF BLOCK DEVICE REMOVABLE
        AX = 4408h
        BL = drive number (00h = default, 01h = A:, etc)
Return: CF clear if successful
            AX = 0000h if removable
               = 0001h if fixed
        CF set on error
            AX = error code (01h,0Fh) (see AH=59h)
SeeAlso: AX=4409h,INT 2F/AX=122Bh

See Also: 214400
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