In computing, sequential access memory (SAM) is a class of data storage devices that read their data in sequence. This is in contrast to random access memory (RAM) where data can be accessed in any order.
While sequential access memory is read in sequence, accesses can still be made to arbitrary locations by "seeking" to the requested ___location. This operation, however, is often relatively inefficient (see seek time, rotational delay).
Sequential access memory is typically used for secondary storage in general-purpose computers due to their higher density at lower cost compared to RAM, and the fact that such memory is typically non-volatile. Examples of SAM devices still in use include hard disks, CD-ROMs and magnetic tapes. Historically, drum memory has also been used.
See also
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