K.S. Bhaskar on 3 Aug 2009 09:07:08 -0700


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Re: [PLUG] Hard Drive warranty RMA


I have used something like sudo dd if=/dev/urandom of=/dev/sdb bs=xxx
count=yyy to write random data to non-root disks before sending them
onwards.  Don't use /dev/random because your system may run out of
entropy and take a few years to wipe the drive.  If you are paranoid,
make multiple passes.  If you are tin-hat paranoid (and want to
protect yourself against the eventuality of a broken write wire to the
disk head), create a large file on a mounted partition from
/dev/urandom, write it to the drive to be wiped with dd, then read the
data and ensure that it matches that which was written.

Cheers
-- BHaskar

On Thu, Jul 30, 2009 at 10:14 PM, TuskenTower<tuskentower@gmail.com> wrote:
> On Wed, Jul 29, 2009 at 10:50 PM, Tom<tom.hornberger@verizon.net> wrote:
>> On Sunday 26 July 2009 13:33:00 TuskenTower wrote:
>>> Apparently, there might be something wrong with the disk, fsck.hfsplus
>>> spat this out in the end.
>>> ** The volume Time Machine Backups could not be repaired after 3 attempts.
>>>
>>> I can't mount the file system RW either:
>>> [804012.270353] hfs: Filesystem was not cleanly unmounted, running
>>> fsck.hfsplus is recommended.  mounting read-only.
>>>
>>> I'm going to do some Googling for a partition wiping utility.  Anyone
>>> have any knowledge about these tools?
>>>
>>> thanks,
>>> Amul
>>>
>> dban (www.dban.org) works well.  I just wiped 2 machines I'm sending back to
>> IT at work with it.
>>
>> HTH,
>> Tom
>
> I thought dban works by booting the whole machine right?  I have an
> external disk that needs nuking.
>
> For the curious, I am using badblock + writing random data to the disk.
>
> thanks,
> Amul
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