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  Description:  Write Sector Long      [PC] [AT] [PS/2]
 
  Writes a sector or sectors from memory to disk. Each sector's worth of data
  must be followed by its 4-byte ECC code.
 
  Input                                     Output
  ══════════════════════════════            ════════════════════════════════
  AH=0BH                                    If function successful
  AL=number of sectors                      Carry flag=clear
  CH=cylinder                               AH=00H
  CL=sector (see Notes)                     AL=number of sectors transferred
  DH=head                                   If function unsuccessful
  DL=drive                                  Carry flag=set
     80H-FFH fixed disk                     AH=status
  ES:BX=segment:offset of buffer               (see Int 13H Function 01H)
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