On 06/03/2019 09:12, Andy Burns wrote:
> R.Wieser wrote:
>
>> I'm intending to do a raw backup (alike DD do if I'm not mistaken) of
>> the SD
>> card on a Windows machine and than zipping it.  For that reason I
>> would like
>> to clear all unused sectors before making the copy, as than the
>> zipping will
>> result in the smallest possible file.
>>
>> Q: Does Stretch have a program available which can do that, and if so
>> which
>> is it ?
>
> 

Thats a neat tool. I wonder if it would work on an SD card with wear
levelling tho?

I suppose from the point of the OP it wouldnt matter...The SDcar would
fully rersent iotse;lf as full of zeroes.

I have to say that the thought of imposing multiple writes on an SD card
to clear it fills me with horror.

I'd far rather take an image of it and zero that.

so DD what's there off to an image FIRST, loop mount it, clear it,
compress it..




--
"First, find out who are the people you can not criticise. They are your
oppressors."
      - George Orwell

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