It offers you the chance to overwrite on the free space left on your hard disk so that no one can retrieve the data that was previously stored on it. You will have to use the Disk Utility app provided by your Mac OS X to erase free space on Mac hard drive. Part 1: How to Erase Free Space on Hard Drives in Mac OS X However, make sure that the erasure is done securely without damaging the hard disk. Now, if you are selling the hard drive of your Mac and don’t want the person buying it to recover the documents that you deleted then you must erase free space on Mac hard drive. However, if this free space doesn’t get overwritten, then it can be used to retrieve the previous data that it held using a data recovery tool. This free space can be utilized for storing other data. Every time you delete any file or document on the Mac hard drive it creates free space.
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