Try using /dev/rdiskX as source instead of /dev/diskX. Does that speed things 
up?

Greetings, 
Florian

Am 12.12.2012 um 16:14 schrieb Garegin Asatryan:

> when working on fully functional hard drives, under linux it performs full 
> i/o speed. when compiled under osx with the default compile flags, it is 
> magnitude times slower, sometimes crawling to Kb/s. the problem persists if 
> the output file is /dev/null.
> 
> I have tried it on 10.5, 10.6, 10.7 and 10.8. the same issue.
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