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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Matthias Apitz <guru@unixarea.de>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: cleaning /usr/obj before copying it to USB key
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> my problem is that the both 'cp -Rp ...' commands takes many hours (12
> and six hours) because they are transferring a lot(!!!) of small files; I

unless you want to kill you USB drive quickly (yes, it simulates disk THAT 
badly) then create image file on your hard disk exactly equal to your USB 
, use mdconfig, make all you need and then write with dd.