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Serial files have several disadvantages, including inefficient data access, as they require sequential reading to locate specific records, which can be time-consuming for large datasets. They also lack flexibility for data manipulation and retrieval, making it difficult to perform complex queries. Additionally, updating or deleting records in a serial file can be cumbersome, often necessitating the rewriting of the entire file. Lastly, serial files offer limited data integrity and security features compared to more structured formats like databases.

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