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where are saved files stored in a computer
Most computer files are stored on some type of data storage device.
What is an example of a data storage device?
For example, most operating systems store files on a hard disk.
What's a hard disk?
A hard disk is an electro-mechanical data storage device that uses magnetic storage to store and retrieve digital data.

Question: Where else can data be stored?
Self-contained rewrite: Where else can digital data be stored, besides hard disks?