AH = 05h
        AL = number of sectors to create on this track
        CH = track
        CL = sector
        DH = head
        DL = drive
        ES:BX = pointer to array of 4-byte address fields
               byte 1 = track
               byte 2 = head
               byte 3 = sector
               byte 4 = bytes/sector  0=128, 1=256, 2=512, 3=1024
Return: CF set if error occurred
        AH = status code (see AH=1 above)
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