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.

Before I take out my SD card to let dcfldd (an enhanced version of dd)
copy an image that gets piped to 7z, I make this via ssh:

sudo ionice -c 3 fstrim -v /

This takes a while. But my 32 GB card's copy uses up 6 GB instead of 10
or so GB (packed).

B. Alabay

--
http://www.thetrial.eu/

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