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* Ease of hardware replacement - programmer would no longer alter a program when data should be migrated to newer model of storage device, provided it supports the same access methods.<ref name=aus/>
* Ease shared data set access - an access method is a trusted program, that allows multiple programs to access the same file, while ensuring the basic data integrity and system security.<ref name=aus/>
Unlike systems derived from [[Unix]], where all files and devices are considered to be an unformatted stream of [[byte]]s, mainframes offer a variety of data options and formats, such as varying types and sizes of [[record (computer science)|records]], and different ways of accessing data, such as via record keys. Access methods provide programs a way of dealing with this complexity.
== Storage access methods ==
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