Any non-volatile storage device, whether internal or external to the computer, is referred to as a secondary storage device. It can be any storage device that allows for long-term data storage in addition to main storage. Secondary storage devices are storage devices that are used in addition to the primary storage, RAM, and cache memory of a computer. They allow the user to save data forever because they are always made of non-volatile memory. Most secondary storage devices, such as the hard disc drive, tape drive, optical storage drive (CD-ROM, Blu-ray, and DVD), and floppy disc drive, used to be built into the computer. They're utilized for a variety of things, including backup data for future restores or disaster recovery, long-term archiving of rarely accessed data, and non-critical data storage on lower-performing, less expensive drives.
