How does computer store everything which is saved even after switching off?
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For a long while, and in many computers still today, you have the hard drive which has magnetic plates. So the magnetic plates store a magnetic charge which can be read. And this is a physical property of the disk that doesn’t require power.
Today, a new technology called SSD is replacing magnetic disks. SSDs use specific configurations of transistors to store electrical charges and can hold onto these charges for quite a while without needing power.
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