In computing, sequential access memory (SAM) is a class of data storage devices that read stored data in a sequence.
[1][2] While sequential access memory is read in sequence, arbitrary locations can still be accessed by "seeking" to the requested location.
This operation, however, is often relatively inefficient (see seek time, rotational latency).
Magnetic sequential access memory is typically used for secondary storage in general-purpose computers due to their higher density at lower cost compared to RAM, as well as resistance to wear and non-volatility.
Magnetic tape is a type of sequential access memory still in use; historically, drum memory has also been used.