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  Interrupt:   13h     Function:   0Bh
 
  Title:       Write Sector Long
 
  Description:                                          [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. This
     function is supported on fixed disks only.
 
     The upper 2 bits of the 10-bit cylinder number are placed in the
     upper 2 bits of register CL.
 
     Input                                Output
 
     AH = 0Bh                             If function successful
     AL = Number of sectors                 Carry flag: clear
     CH = Cylinder                          AH = 00h
     CL = Sector                            AL = Number of sectors
     DH = Head                                   transferred
     DL = Drive
        = 80h-FFh fixed disk              If function unsuccessful
     ES:BX = segment:offset of buffer       Carry flag: set
                                            AH = Status
                                                 See: Int 13h Function 01h
                                    -♦-