How does it physically “forget” whatever coded form it held my word document in for example?
In: Technology
They generally don’t. They just go to the index and delete the reference (called a “pointer”) to that document or file. In rare cases (like government computers) we repeatedly rewrite over the file. That way, you can’t just find the file and add it back into the index of files on the computer.
Rarely, something will go wrong in the hardware (ie a wire will break) of the computer and corrupt a sector, but there’s not much I can say about that.
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