Currently Being ModeratedMay 16, 2013 7:24 AM (in response to Muizen)
Move it to the Trash, then use Secure Empty Trash. This will overwrite the file with random data (0s and 1s) 7X. No one except maybe the NSA, and probably not even them, will be able to recover it.
Currently Being ModeratedMay 16, 2013 7:36 AM (in response to WZZZ)
WZZZ . As I concluded this should solve my question.
However, after opening Trash, I could not find the command: "Secure Empty Trash"
How can I find this? I am in Snow Leopard 10.6.8
Currently Being ModeratedMay 16, 2013 7:49 AM (in response to Muizen)
Currently Being ModeratedMay 16, 2013 9:55 AM (in response to Muizen)
Just a tip, if you want to make 100% sure all files you have previously deleted are permanently gone:
- launch Disk Utility (Utilities/Disk Utility)
- select your HD volume (i.e. "Macintosh HD")
- go to "Erase" tab and select "Erase Free Space"
- select one of the wiping methods and then click "Erase Free Space"
Note: "Zero Out Deleted Files" is the fastest, while "35-Pass Erase of Deleted Files" is the longest method (depends on the amount of free space left on your HD, and on how fast the actual HD hardware is).
Currently Being ModeratedMay 16, 2013 10:24 AM (in response to Brazeca)
Anything more than zero one pass is overkill, unless the drive is going to the NSA.
And I don't know how reliable Erase Free Space is in ML or Lion, but in lower OS versions like Snow it's best to do this booted from another volume or problems result--as in a huge temporary file that may be difficult to remove.
Currently Being ModeratedMay 16, 2013 10:34 AM (in response to Muizen)
With a Zero erase data can still be recovered using magnetic techniques, how evidence against Brian Manning was used. Takes hours at most as it's a one pass.
7x over pass is Department of Defense/NSA level grade for hard drives, takes hours or even days.
35x is overkill and takes weeks to complete, was done because people didn't know at the time what would be effective enough and hard drives were smaller then.
SSD cannot be securely erased, NSA says to turn them into a fine powder.
Also if one interupts the erase process, it could leave the large undeleted file it creates which can cause problems.
So make sure that doesn't occur and/or have a clone of the parittion on a external drive as backup.