Secondary storage can be used to restore a backup of your files if you have to format. You can use it if you run out of room on your main hard drive. If it is external secondary storage you can also bring it with you if you need to access files at work or somewhere else.
Commonly used types of secondary storage are the USB drive and Floppy Disk.
Without secondary storage, you would lose all of your data everytime your computer powered down. In other words, your computer would not have anywhere to save data indefinitely.
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