You can just fill a file with zeros and let it grow until de device is
full.

dd if=/dev/zero of=/foo.0
El 22/07/2012 19:26, "Jarry" <mr.ja...@gmail.com> escribió:

> Hi,
> I want to backup my whole hard-drive (8 partitions) with:
> # dd if=/dev/sda | gzip > /path/image.gz
>
> In order to achieve good compression level I'd like to wipe
> out all empty space with zeros. How can I do that?
>
> Jarry
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