The different types of file organsiation are sequential or serial organization, Direct Access or Random organization, Indexed sequential Access Method (ISAM).
Sequential or serial organization: In sequential access, records within a file are read or written in sequential order i.e., in the same order they are organized in the file. In sequential or serial access, the information can be retrieved in the same sequence in which it is stored. The data records are arranged one after the other. The records are stored on the basis of order of the record.
In sequential organization, the data records are stored in a predetermined order based on the key fields. There is a definite relationship between logical position and physical position. The key field organizes the records.
