Auxiliary storage technology describes storing hardware and files that a computer may not always be able to immediately reach. This contrasts with main storing methods like internal hard drives, which are always accessible.

External hard disks, USB flash drives, and cassette drives are a few examples of secondary storing devices. The system can only reach these devices if they are attached to a computer's exterior I/O interfaces. They might or might not need their own fuel source.

Recordable CDs and Discs, floppy disks, and portable disks like Zip and Jaz disks are a few examples of auxiliary storing media. To be viewed by the computer, each of these kinds of media must be placed into the proper disk. Floppy disks and portable disks are no longer frequently used, but CDs and Discs are still widely used to store and transmit data.

Secondary storage technology is frequently used for preservation and backup reasons because a computer cannot always reach it. A auxiliary recording device can be used to transfer a recent copy to a new system if a computer stops working. As a result, if you back up your data to a supplementary storage device, be sure to perform frequent copies and routine data testing.