Aug 28, 2019  Don't bother using secure erase to wipe your Mac SSD or hard drive. It's no longer considered secure. Marking the space they occupy as free. With the award-winning free space erase option in iShredder™ iOS®, you can wipe the unused disk space securely so that deleted data cannot be recovered. Apr 28, 2016  Many Mac users running a modern version of OS X El Capitan have noticed the Secure Erase Free Space feature has gone missing from Disk Utility.

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Aug 23, 2019  Where F is the letter of the drive you want to securely overwrite the free space on. It will overwrite the free space with three passes as seen above.

Jun 08, 2020 • Filed to: Solve Mac Problems • Proven solutions

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.

Part 1: How to Erase Free Space on Hard Drives in Mac OS X

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.

  1. The initial step is to start the Disk Utility app. This app is located in the Utilities menu which can itself be found in the Applications menu. You can use the Launchpad for launching this app as well.
  2. If the hard drive whose free spaces you want to erase is an external hard disk then you would have to connect it to the Mac and then select it from the menu located on the left-hand side of the screen.
  3. Click the Erase free space button after opening the Erase tab.
  4. Pick the level of erasure you want and the click the Erase free space to start the overwriting process on the hard drive’s vacant spaces.
  5. There are three different erasure options available to you which are Fastest, Secure and Most Secure. Fastest option overwrites the free space just once while Secure and Most Secure options do that three and seven times respectively.
  6. Select any of the erasure options that you like and then click the Erase free space button.

Part 2: How to Secure Erase Free Space on Hard Drives in Windows

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.

Mac Secure Erase App Free Space Games

  • Completely erases the data, ensuring that it can’t be recovered using any data recovery tool.
  • Supports multiple data erase algorithms which can be used for erasing data.
  • Provides a search feature for quickly search the file or document which needs to be erased from the hard drive.
  • Offers the chance to erase the chat history of messaging services like Yahoo and Skype.
  • Capable of erasing all traces of internet activity including the internet history maintained by popularly used browsers.

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.

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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.

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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 professional Mac data recovery tool.

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Mac Secure Erase App Free Space Download

I saw this elsewhere and wanted to check whether folks here felt this was a safe and appropriate method for clearing all personal info off an SSD in preparation for sale etc. I'm QUOTING the following and if, for any reason, this is inappropriate for the forum, please delete or obscure. Not sure on the protocol of quoting so much text.
QUOTED TEXT BELOW THIS LINE
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SECURE ERASE A SSD FROM COMMAND LINE
Securely erasing free space on your SSD
If you don’t want to take Apple’s word for it, if you’re not using FileVault, or if you just want to, there is a way to securely erase free space on your SSD. It’s a little more involved but it works.
Before we get into the nitty-gritty, let me state for the record that this really isn’t necessary to do, which is why Apple’s made it so hard to do. But if you’re set on it, you’ll need to use Apple’s Terminal app. Terminal provides you with command line interface access to the OS X operating system. Terminal lives in the Utilities folder, but you can access Terminal from the Mac’s Recovery System, as well. Once your Mac has booted into the Recovery partition, click the Utilities menu and select Terminal to launch it.
From a Terminal command line, type:
diskutil secureErase freespace VALUE /Volumes/DRIVE
That tells your Mac to securely erase the free space on your SSD. You’ll need to change VALUE to a number between 0 and 4. 0 is a single-pass run of zeroes; 1 is a single-pass run of random numbers; 2 is a 7-pass erase; 3 is a 35-pass erase; and 4 is a 3-pass erase. DRIVE should be changed to the name of your hard drive. To run a 7-pass erase of your SSD drive in “Peters-Macbook”, you would enter the following:
diskutil secureErase freespace 2 /Volumes/Peters-Macbook
And remember, if you used a space in the name of your Mac’s hard drive, you need to insert a leading backslash before the space. For example, to run a 35-pass erase on a hard drive called “Macintosh HD” you enter the following:
diskutil secureErase freespace 3 /Volumes/Macintosh HD
Something to remember is that the more extensive the erase procedure, the longer it will take.
Your type of drive
One final thing, and maybe this should have been first, before you can securely erase your files on your Mac, you need to know if you have a standard hard drive or an SSD. To find out, or at least to make sure, you click on the Apple menu and select “About this Mac”. Once there select the “Storage” tab to see which drive is in your system.