File Organization

For information to be useful it should not only be recorded, but it should also be easy to access and retrieve the information. File organization may be:
1.  Serial
2. Direct access
3. Indexed sequential access

Serial Organization: In serial file organization, records are held and accessed in a predetermined sequence of keys. Records can be organized in numerical, alphabetical or chronological order.

Direct Access Organization: Direct access files are stored on magnetic disks or other devices where each record is assigned a physical address.

Indexed Sequential Access: The computer records of an indexed sequential file are stored in the main storage portion of the file, which is divided into sections called segments. Usually, all segments are the same physical size e.g. one cylinder.

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