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  Description:  Initialize Fixed Disk Characteristics      [PC] [AT] [PS/2]
 
  Initializes the fixed disk controller for subsequent I/O operations, using
  the values found in the ROM BIOS disk parameter block(s).
 
  Input                                           Output
  ════════════════════════════════════            ══════════════════════════
  AH=09H                                          If function successful
  DL=drive                                        Carry flag=clear
     80H-FFH fixed disk                           AH=00H
  and, on the PC/XT                               If function unsuccessful
  Vector for Int 41H must point                   Carry flag=set
   to disk parameter block                        AH=status
  or, on the PC/AT and PS/2                       (see Int 13H Function 01H)
  Vector for Int 41H must point
   to disk parameter block for drive 0
  Vector for Int 46H must point
   to disk parameter block for drive 1
                                    -♦-