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Re: Default number of overwrites in shred
From: |
Peter Eckersley |
Subject: |
Re: Default number of overwrites in shred |
Date: |
Fri, 04 May 2007 16:04:19 -0700 |
On Fri, 2007-05-04 at 15:35 -0700, Paul Eggert wrote:
> I looked into the ATA side a bit more. The hdparm command has
> --security-erase and --security-erase-enhanced options that look like
> they should use the ATA functions in question. This could well be
> more suitable for the paranoid than 'shred' is. However, for these
> features the current hdparm manual says "THIS FEATURE IS EXPERIMENTAL
> AND NOT WELL TESTED. USE AT YOUR OWN RISK." So perhaps 'shred' should
> wait a bit before using this kind of facility, even if it's faster and
> more-secure.
>
> In the meantime, perhaps the EFF would like to test hdparm? (On their
> own drives, not mine! :-)
Those hdparm commands zap the entire drive. We could test them,
although it'd be hard to test them in any interesting way. I saw some
mentions of an ATA secure blockwise erase too. That should really be
linked to chattr +s in the filesystem code. Maybe once we've got the
userspace parts of this problem sorted, we could look at that...
--
Peter Eckersley address@hidden
Staff Technologist Tel +1 415 436 9333 x131
Electronic Frontier Foundation Fax +1 415 436 9993
- Re: Default number of overwrites in shred, (continued)
Re: Default number of overwrites in shred, Paul Eggert, 2007/05/03
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/03
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred,
Peter Eckersley <=
- Re: Default number of overwrites in shred, Philip Rowlands, 2007/05/05
- Re: Default number of overwrites in shred, Pádraig Brady, 2007/05/06
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/08
Re: Default number of overwrites in shred, John Cowan, 2007/05/04
Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04