<P> Tertiary storage or tertiary memory provides a third level of storage . Typically , it involves a robotic mechanism which will mount ( insert ) and dismount removable mass storage media into a storage device according to the system 's demands ; such data are often copied to secondary storage before use . It is primarily used for archiving rarely accessed information since it is much slower than secondary storage ( e.g. 5 -- 60 seconds vs. 1 -- 10 milliseconds ) . This is primarily useful for extraordinarily large data stores , accessed without human operators . Typical examples include tape libraries and optical jukeboxes . </P>
<P> Tertiary storage or tertiary memory provides a third level of storage . Typically , it involves a robotic mechanism which will mount ( insert ) and dismount removable mass storage media into a storage device according to the system 's demands ; such data are often copied to secondary storage before use . It is primarily used for archiving rarely accessed information since it is much slower than secondary storage ( e.g. 5 -- 60 seconds vs. 1 -- 10 milliseconds ) . This is primarily useful for extraordinarily large data stores , accessed without human operators . Typical examples include tape libraries and optical jukeboxes . </P>
the two most common tertiary storage media are
the two most common tertiary storage media are
tape libraries optical jukeboxes
tape libraries optical jukeboxes