Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 13h Function 03h
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  Interrupt:   13h     Function:   03h
 
  Title:       Write Sector
 
  Description:                                          [PC] [AT] [PS/2]
 
     Writes one or more sectors from memory to disk.
 
     Input                                Output
 
     AH = 03h                             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
        = 00h-7Fh floppy disk             If function unsuccessful
        = 80h-FFh fixed disk                Carry flag: set
     ES:BX = segment:offset of buffer       AH = Status
                                                 See: Int 13h Function 01h
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