Every time you delete any file or document on the Mac hard drive it creates a free space. This free space can be utilized for storing other data. 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. 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, make sure that the erasure is done in a secure manner without damaging the hard disk.
You will have to use the Disk Utility app provided by your Mac OS X to erase free space on Mac hard drive. It offers you the chance to overwrite on the free space left on your hard disk so that no one is able to retrieve the data that was previously stored on it. However, do keep in mind that this method for free space erasure is only applicable for traditional hard drive and won’t work on SSD versions that utilize flash memory.
Although the Disk Utility app of Mac OS X can erase free space on Mac hard drive, there is a chance that it might not be able to do so in a secure manner. To make sure that the erasing of the free space is completed without any damage to the hard drive then using a data erasure tool is the best option. There are various such tools available on the internet but the best one among them is Stellar BitRaser for File. It has the capability to secure erase free space on hard drives and ensure that the deleted data can’t be recovered.
Step 1: Download Stellar BitRaser for File on your Windows PC, take out the hard drive on Mac and connect it to Windows computer.
Step 2: Click the "Erase Unused Space" option on the left, to select your Mac hard drive.
Step 3: Selected your Mac hard drive and click "Erase Now" button to process.
Step 4: After a while, the Mac hard drive erase complete and you can reboot the system.
While other data erasure tools take several passes to erase the free space on a hard drive, Stellar BitRaser only requires a single pass to erase it permanently. However, if you feel the need to take another pass then you can take two more passes. This will ensure beyond doubt that the free space on your Mac hard drive is erase forever.
In order for you to use Stellar BitRaser for File to erase free space on Mac hard drive, you need to take it out from your Mac first. The reason for this is that this data erasure tool isn’t compatible with Mac OS X and works only on Windows. So, you need to connect the Mac hard disk to a Windows PC before you erase the free spaces on it using Stellar BitRaser for File.
In short, deleting data on the Mac hard drive doesn’t securely erase it. It just creates free space which can be used for recovering the deleted data using a data recovery tool. So, you need to erase free space on Mac hard drive. The Disk Utility app of Mac OS X can be used for erasure of these free spaces. However, for secure erasure, you need to make use of a reliable data erasure tool like Stellar BitRaser for File. It can erase the vacant spaces on your Mac hard drive and make sure that the data that they contained previously can’t be retrieved using any data recovery tool.