In the right (More Secure) position, the process repeats seven times.
In the middle position, half way between Faster and More Secure, your data is replaced with garbage, which is replaced with other garbage, which is replaced with new garbage a third time, which is then marked as free. That's what the slider in Disk Utility controls: number of repetitions.
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The difference is that, in the case of erasing free space, the process can be repeated multiple times. Erasing free space securely works just like emptying the Trash securely: the data in question – in this case, all the free, unlinked data on your hard drive – is replaced with meaningless data, which is itself marked as free and is eventually replaced with new files. Note that securely erasing free space will take more time than erasing non-securely does, just like Secure Empty Trash.
This will securely erase all the free space on your hard drive – including deleted files and their data remanence – but leave your files intact.Įven so, it is, of course, best to make a backup first, just in case. Click Erase Free Space to start the process. Select the drive and partition in question (probably your boot disk unless the files were on another hard drive) from the list on the left, and navigate to the Erase tab.Ĭlick 'Erase Free Space' and, in the sheet that appears, put the slider in the left (Faster) position (we'll discuss the More Secure options in a moment). Start by opening Disk Utility, found in Applications/Utilities. If you've previously deleted files by emptying the Trash non-securely and want to make sure that your privacy is protected, OS X will help you erase them completely. Securely erase files you've already deleted Use Disk Utility's Erase Free Space tool to overwrite previously deleted files 3.
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