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Jan 17, 2012 1:48 AM in response to azrimiskalby X423424X,In general terms, files are accessed through a directory structure. When you do a non-secure erase in the trash the directory entry is removed and the disk space for the file made available for future use by any data that needs it. Theoretically the file could be recovered (Data Rescue claims to be able to do this) but the probability goes down as time goes on since the space will eventually get reused.
If you do a secure-erase the file data itself is overwritten to destroy it. This is why a secure erase takes longer than a non-secure erase.
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Jan 17, 2012 2:11 AM in response to X423424Xby azrimiskal,Hi, thank you for replying. Can you explain how do I do a secure erase in trash bin?
Sorry, really new at using Mac.
Would appreciate it a lot! (:
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Jan 17, 2012 2:48 AM in response to azrimiskalby X423424X,Here's two ways to do a secure empty trash in the Finder:
1. Right (control) click on the trash in the dock to bring up the contextual menu. If you also push the command key the "Erase Trash" contextual menu item will change to "Secure Empty Trash". Select it with the mouse and and release the mouse (unclick).
2. In the Finder menu you will see both Empty Trash and Secure Empty Trash. Select Secure Empty Trash with your mouse.
You might want to look over the following documentation: