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A serial access file has data stored on it in the order in which it was written. Each new record goes at the end of the file. To read a record from the file it is necessary to read through all the preceding records first.


A sequential access file has data stored on it in the order of the data in a key field.



A direct access file is one where any record can be accessed without having to access other records first. This is also known as random access.

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