When you delete a file from your computer, it doesn't simply disappear
from existence—at least, not right away. Even if you immediately empty
the Recycle Bin or Trash folder, all your deletion does is earmark the
space that file takes up on your hard drive as vacant. Until another
file or application comes along to make use of that room, the old data
will continue to sit there. Which is why specialized programs can often
recover deleted files for you.
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