![]() Unless that happens, however, those bits of data from the original file will still be on your hard drive, and may be accessible via special data recovery applications or, in more serious cases, physical analysis of the drive’s internal platters themselves. Therefore, if you delete a bunch a files and then load your Mac up with new data, there’s a good chance that your new data will need the space occupied by your deleted file and then overwrite it. It simply says “hey, this page is no longer needed, so go ahead and write new information on it when necessary.” ![]() When you delete a file, including when you Empty the Trash, your Mac essentially erases the file’s entry in the index, but doesn’t go and erase the page in the book on which the information was stored. ![]() The index tells you (the computer) exactly which page to turn to when you need a specific piece of information, but the information itself exist only on that page. Here’s a good analogy: think of your Mac’s hard drive as a book with a table of contents or index. ![]()
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