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Secure Empty Trash

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Alexander KallasSecure Empty Trash
by on Apr 28, 2008 at 4:51:25 am

What does this really do?
AFAIK it overwrites the drive instead of just wiping the directory.
Is this the best way to go before re-formating, or does
"erase drive" in the disc utility give you enough of a fresh surface?


Cheers
Alexander


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Curtis ThompsonRe: Secure Empty Trash
by on Apr 28, 2008 at 2:45:29 pm

hello...

secure empty trash writes random data over the space the file took up on the hd numerous times to help ensure that nobody can recover the file later...

just erasing a drive with a simple format will require that the drive be taken somewhere to recover data, but you can also use the secure erase options with disk utility:

http://docs.info.apple.com/article.html?artnum=303462

which might have been what you were talking about - but yes - in the end secure erase and secure empty are doing the same thing, which is writing random data over data to ensure that the original data cannot be recovered...

sitruc






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Alexander KallasRe: Secure Empty Trash
by on Apr 28, 2008 at 11:19:39 pm

Thanks Curtis.
I am refering to external drives.
In Panther (I have an unfinished project) the "secure erase' is not an option.
Erase there is so darn quick, I doubt it is overwriting, as does 'secure empty trash"
which takes so... much longer.
So what is the best option for a clean external media drive in Panther?

Cheers
Alexander


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Curtis ThompsonRe: Secure Empty Trash
by on Apr 29, 2008 at 2:01:08 am

hello...

[Alexander Kallas] "So what is the best option for a clean external media drive in Panther?"

this really totally depends on your needs - trashing a file erases it just fine...the only difference that secure offers is that it renders the file unrecoverable should someone take your drive to a recovery center or the likes...

(and even plain erase after a while makes it unrecoverable - the secure just intentionally writes junk over the spaces the file took up right then and there, whereas over time the computer will use that space again and again which is the same thing in the long run)

if you have data on that external drive that is sensitive, i'd consider encrypting the volume with on-the-fly encryption with something like truecrypt - that way nobody can read the data to begin with...but if you just have plain old files on there, a simple empty trash should suffice...

sitruc





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Alexander KallasRe: Secure Empty Trash
by on Apr 29, 2008 at 5:46:28 am

Thanks Curtis,
the reason for this question is that a Windows machine with MacDrive is being used to encode video. The resultant file is either incomplete (does not write to the end) or has artifacts at odd points.
My thoughts were that it is reading some undeleted files.
The only other reason I can think of is the 4-pin firewire port in the windows machine is inadequate for the Data comming via the 6-pin FW 400 port on the Mac formatted external drive.
Any ideas please?

Cheers
Alexander


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Curtis ThompsonRe: Secure Empty Trash
by on Apr 29, 2008 at 3:33:27 pm

hello...

[Alexander Kallas] "My thoughts were that it is reading some undeleted files"

ahh - and by "undeleted" you mean non-completely destroyed files? that would be almost impossible - files are deleted from the file system and the fs won't use them again...they just might be findable if you took the drive to a recovery specialist...

sitruc





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