bcwipe and softupdates

bcwipe and softupdates

Post by Newbi » Wed, 25 Jun 2003 20:34:05



i was wondering if bc-wipe would work with softupdates. it seems to work
but is the data track really overwritten x-times or wouldn't it just be
cached and then synced? in other words: is bc-wipe safe with enabled
softupdates?

hope you understood my question.

thanks,
newbie

 
 
 

bcwipe and softupdates

Post by Michael Sierchi » Wed, 25 Jun 2003 22:38:16



> i was wondering if bc-wipe would work with softupdates. it seems to work
> but is the data track really overwritten x-times or wouldn't it just be
> cached and then synced? in other words: is bc-wipe safe with enabled
> softupdates?

bc-wipe isn't safe, period.  At best, it offers a probabilistic
erasure.  At worst, the underlying sectors may have been remapped
silently by the drive, or moved and left behind in the normal
FFS allocation strategy to reduce fragmentation.

The m*of the story: you can't rely on overwriting irrevocably to
delete sensitive data.

 
 
 

bcwipe and softupdates

Post by Kris Kennawa » Thu, 26 Jun 2003 07:00:10



> i was wondering if bc-wipe would work with softupdates. it seems to work
> but is the data track really overwritten x-times or wouldn't it just be
> cached and then synced? in other words: is bc-wipe safe with enabled
> softupdates?

You're correct that most of the data operations will be optimized away
if softupdates is in effect.

Kris