Why does installing a game/program sometimes take several hours, but uninstalling usually take no more than a few minutes?
In: 3666
Deleting is just removing pointers and references to the data. Think of erasing a line from a table of contents in a book. The chapters (data) is still there but all pointers to it are gone.
Installing is unpacking, determining what options are necessary and updating or overwriting hundreds/ thousands of files.
This unpacking (temp files) also needs space to work, not enough and the system is constantly moving things around. Think of inserting a new chapter in middle of book that is bigger than the space you have.
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