Secondary storage

Secondary storage (often also called auxiliary storage) is anything that stores data other than the temporary storage in things like RAM. In a personal computer, secondary storage usually consists of a hard disk and removable media.

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External storage is also secondary storage. External secondary storage devices are used to:

• back up data
• add more storage space for files, photographs, videos, and so on
• transfer files between computers
• easily transport files without taking your computing device with you
• share files over a network.

Different types of non-volatile secondary storage include the following:

• magnetic storage
• optical storage:
• compact disk (CD)
• digital versatile disk (DVD)
• Blu-ray disk (BD)
• solid-state disk
• USB drive (memory stick or pen drive)
• flash memory card.