1  –  Formatted

  Formatted sequential WRITE statement format:

     WRITE (extu,fmt [,adv][,err][,iostat]) [iolist]

  Writes to a specified external unit.  Translates the data from
  binary to character format as specified by "fmt".

2  –  List-directed

  List-directed sequential WRITE statement format:

     WRITE (extu,*[,iostat][,err]) [iolist]

  Writes to a specified external unit.  Translates the data from
  binary to character format according to the data types of the
  variables in the I/O list.

3  –  Namelist

  Namelist sequential WRITE statement format:

     WRITE (extu,nml[,iostat][,err])

  Writes to a specified external unit.  Translates the data from
  binary to character format according to the data types of the list
  entities in the corresponding NAMELIST statement.

4  –  Unformatted

  Unformatted sequential WRITE statement format:

     WRITE (extu[,iostat][,err]) [iolist]

  Writes to a specified external unit.  Does not translate the data.