How to wipe a HD?
david walcroft
david_walcroft at yahoo.com.au
Sat Apr 23 00:36:28 UTC 2005
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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