<P> In computing, sequential access memory (SAM) is a class of data storage devices that read stored data in a sequence . This is in contrast to random access memory (RAM) where data can be accessed in any order . Sequential access devices are usually a form of magnetic storage . </P> <P> 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). </P>

Difference between random access drive and sequential access drive