![]() Keep in mind that the latter two options take longer to complete, because they are performing the same overwrite task either 3 times or 7 times. Most Secure – The most secure option that also takes the longest, this writes data over the free space a total of 7 times.Ĭhoose whichever option is most appropriate for your needs, but it's generally recommended to use the "secure" or "most secure" option if you intend on transferring ownership of a hard drive, or if you suspect a hard drive that once contained important data has the chance of being stolen or misused.Click 'Storage.' You should see a stacked bar graph depicting how much of your total storage is being taken. Secure (middle option) – A triple pass erasure, this writes zeros over the unused space three times. Click on the Apple logo at the top left of your screen.Fastest – The quickest option, this does a single pass write of a bunch of zeros over the unused portion of the hard drive.The three Erase Free Space options are as follows:.Select the desired level of erasure and choose "Erase Free Space" to begin the process of overwriting the free space on the hard drive. ![]() In the window that pops up, click on Storage to bring up the storage pane.
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