- Download and install the 30-day free BitRaser File Eraser tool on your Mac. Launch the tool and from the ' Select What To Erase ' screen, toggle on Unused Space, then click Next. Select the volume to erase unused space, then click Erase. On the Confirm Erasure dialog box appears, click Confirm Erase.
- Wipe free space and file slack on your Mac to remove all traces of previously deleted files. Wipe a whole drive or partition mounted on your active computer (including external USB flash drives) BCWipe Task Manager to conveniently manage wiping tasks and logging. BCWipe wiping commands can be run from Mac Finder, BCWipe Task Manager.
- When you check the free disk space on your Mac, you will get the bad news about the “Disk is Almost Full”. That means a large amount of files are occupying most of the disk space on your Mac. What you need is to delete those junk files and clear disk space on the device.
Wipe Free Space Macbook
When deleting a file, most operating systems just delete the reference to this file, not its actual content. For illustration, that’s like removing a chapter from a book’s table of contents without actually removing (and shredding) the according pages in the book.
Answer: A: I had the same problem as well. I went to system preferences and turned off FileVault under security and privacy. Then I restarted my mac in recovery mode, OS X: About OS X Recovery - Apple Support. Selected my mac drive and the partition tab and I was able to resize my main drive.
So, in order to really (securely) delete a file on a hard disk, there are basically two methods (simplified; from a technical point of view it’s both the same):
- Overwrite the file content (i.e. its clusters) with random data
- Delete the file as usual, empty the trash and overwrite the whole free space on the according hard disk with random data
For the second method, here’s how to do it using Mac OS X:
Wipe Free Space Mac Download
- Delete the file(s) and empty the trash
- Find out the device name of the according hard disk by opening a new ‘Terminal’ window and executing the “df” command. For example, for a RAID 1 disk, the path of the disk might be something like “/dev/disk2”
- In the opened ‘Terminal’ window, execute:
diskutil secureErase freespace 1 /dev/disk2
where “1” stands for “single-pass random-fill erase” and “/dev/disk2” is the disk device (adjust this to match your disk). When prompted, enter the admin’s credentials.
Note that overwriting free space like this takes quite some time depending on the amount of free space there is and how many passes you need (e.g. use “2” for a US DoD 7-pass secure erase or “3” for a Gutmann 35-pass secure erase). For more information about diskutil and its options, see “man diskutils”.