Once installed, you can right-click a file or folder and choose Eraser > Erase from the right-click menu. The most widely recommended tool to securely delete a file or write over empty space to ensure previously deleted files aren't recoverable is a freeware tool called Eraser. I recently upgraded to a new MB Pro with SSD drive and have done some reading. On my older MB Pro with magnetic hard drive, I used File Shredder to accomplish this. The best recommendation I can make for these types of media is to use encryption as soon as you unpack the medium. A couple of OS versions ago, Apple stopped including a Secure Empty Trash option, I believe because of the adoption of SSD drives. Note : Deleting files from flash drives is very hard (Solid State Disks, USB keys, SD Cards, etc) The information in this post applies only to traditional spinning disks (what we call hard drives). The only sure way to ensure that the information is permanently deleted is by using a special process or tool that overwrites the drive. If I take an unlocked file and mark it as locked, move it to trash and try. Selecting the 'remove all locked files option' does nothing and the trash doesn't empty. In most cases, the entry to the file was removed from the index but unless that disk space is needed by the operating system, the file is most likely still on the disk (just isn't normally accessible anymore). When trying to secure empty trash it reports 'some files are locked' when they are not. Most computer (or smartphone/tablet) users believe that when you use the delete function in your operating system, you have securely destroyed the file beyond recovery, but that simply isn't the case.

You should also read my previous article ' OPSEC - Introduction to Malware'.

Secure empty trash mac 2020