[Novalug] need dd help

Alex Smith (K4RNT) shadowhunter@gmail.com
Mon Feb 13 00:30:34 EST 2012


You sure there aren't any other problems with this disk? You tried
recreating the partition table and such?

On Mon, Feb 13, 2012 at 00:04, Jay Hart <jhart@kevla.org> wrote:
> I can't seem to get a valid volume going under FreeNAS, so I'm resorting to
> removing all data on the drive, followed by a system reboot to see if this
> clears my issue.
>
> Jay
>
>> There is a live CD called Darik's Boot and Nuke (DBAN) that will do
>> this for you with varying algorithms, and can also achieve DoD and
>> NIST standards for data destruction, if that's your goal. It may be
>> easier than doing this.
>>
>> http://www.dban.org/
>>
>> On Sun, Feb 12, 2012 at 23:27, Soren Harward <stharward@gmail.com> wrote:
>>> On Sun, Feb 12, 2012 at 10:28 PM, Jon LaBadie <novalugml@jgcomp.com> wrote:
>>>> I find when making large transfers like this that a
>>>> larger buffer size greatly speeds up dd.  I'd suggest 4k.
>>>
>>> I've found that most block devices run faster with blocks even larger
>>> that 4k; but if you go too large, then the rate starts dropping again.
>>>  If you're trying to zero out a 1TB drive, I'd suggest adding the
>>> option "count=1000" and trying several different 2^n block sizes to
>>> find the optimal transfer rate.  My version of dd conveniently prints
>>> the transfer rate when it's finished.  My hard drive is about 30%
>>> faster with 32k blocks than with 4k blocks.
>>>
>>> --
>>> Soren Harward
>>> _______________________________________________
>>> Novalug mailing list
>>> Novalug@calypso.tux.org
>>> http://calypso.tux.org/mailman/listinfo/novalug
>>
>>
>>
>> --
>> " ' With the first link, the chain is forged. The first speech
>> censured, the first thought forbidden, the first freedom denied,
>> chains us all irrevocably.' Those words were uttered by Judge Aaron
>> Satie as wisdom and warning... The first time any man's freedom is
>> trodden on we’re all damaged." - Jean-Luc Picard, quoting Judge Aaron
>> Satie, Star Trek: TNG episode "The Drumhead"
>> - Alex Smith (K4RNT)
>> - Dulles Technology Corridor (Chantilly/Ashburn/Dulles), Virginia USA
>> _______________________________________________
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>>
>
>
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-- 
" ' With the first link, the chain is forged. The first speech
censured, the first thought forbidden, the first freedom denied,
chains us all irrevocably.' Those words were uttered by Judge Aaron
Satie as wisdom and warning... The first time any man's freedom is
trodden on we’re all damaged." - Jean-Luc Picard, quoting Judge Aaron
Satie, Star Trek: TNG episode "The Drumhead"
- Alex Smith (K4RNT)
- Dulles Technology Corridor (Chantilly/Ashburn/Dulles), Virginia USA



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