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  Description:  Write Sector Buffer      [PC]
 
  Transfers data from system memory to the fixed disk adapter's internal
  sector buffer. No data is written to the physical disk drive.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════
  AH=0FH                                    If function successful
  ES:BX=segment:offset of buffer            Carry flag=clear
                                            If function unsuccessful
                                            Carry flag=set
                                            AH=status
                                            (see Int 13H Function 01H)
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