allocating disk space the fast way

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hello list.
i want to allocate some space for a harddisk image file.
for now, i do it like
$ dd if=/dev/zero of=blub.img bs=1M count=2000
which takes some time. is there a faster way to create a huge file? it
don't have to be zeroed.
i've seen that e.g. azureus allocates filesize in no time. how does this
work?

thanks in advance,
josef gosch

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