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Re: How to wipe a HD?



If you don't care about deleting all the data, a much easier way is:

dd if=/dev/zero/ of=/dev/hda

It will run for awhile (without a progress bar) and then stop. Check the man pages if you want to check the progress of the wipe.
-ben


david walcroft wrote:

jludwig wrote:

On Wednesday 20 April 2005 08:34 pm, david walcroft wrote:

Vinicius wrote:

Hello,

How to wipe a HD, please?

Atte.,
Vinicius.


Give this a try ,its a boot floppy and overwrites from 1 > 25 times as
selected (but slowly!!!)

http://staff.washington.edu/idlarios/autoclave/clave03.img

david >


Try man shred

Shred is the linux utility for cleaning hard drives.
Delete FILE(s) if --remove (-u) is specified. The default is not to
remove the files because it is common to operate on device files like
/dev/hda, and those files usually should not be removed. When operat-
ing on regular files, most people use the --remove option.


CAUTION: Note that shred relies on a very important assumption: that
the filesystem overwrites data in place. This is the traditional way
to do things, but many modern filesystem designs do not satisfy this
assumption. The following are examples of filesystems on which shred
is not effective:


* log-structured or journaled filesystems, such as those supplied with

AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)

* filesystems that write redundant data and carry on even if some
writes


fail, such as RAID-based filesystems

* filesystems that make snapshots, such as Network Appliance’s NFS
server


* filesystems that cache in temporary locations, such as NFS

version 3 clients

* compressed filesystems

In addition, file system backups and remote mirrors may contain copies
of the file that cannot be removed, and that will allow a shredded
file to be recovered later.


Autoclave uses Shred and I use ext3 filesystem and Autoclave wiped my disk but I didn't test the disk (WD 120GB) to see how it performed.

david



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